https://restorerivers.eu/wiki/api.php?action=feedcontributions&feedformat=atom&user=Pollygwenbryant 2026-04-07T07:44:49Z User contributions MediaWiki 1.39.7 https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36726 2016-03-01T12:58:45Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site}}<br /> {{Project background<br /> |Works started=2011/01/01<br /> |Works completed=2011/10/31<br /> |Project completed=2010/10/31<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=Fish Passage<br /> |Biological quality elements=Fish, Invertebrates, <br /> |Physico-chemical quality elements=Heavy Metals<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir notched; channel narrowing, bank reprofiling, addition of gravels and large woody material, native aquatic plants<br /> |Floodplain / River corridor=Native aquatic planted added<br /> |Social measures=Local consultation; volunteer community days<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36725 2016-03-01T12:57:22Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site}}<br /> {{Project background<br /> |Works started=2011/01/01<br /> |Works completed=2011/10/31<br /> |Project completed=2010/10/31<br /> }}<br /> {{Motivations}}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir notched; channel narrowing, bank reprofiling, addition of gravels and large woody material, native aquatic plants<br /> |Floodplain / River corridor=Native aquatic planted added<br /> |Social measures=Local consultation; volunteer community days<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36724 2016-03-01T12:54:16Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir notched; channel narrowing, bank reprofiling, addition of gravels and large woody material, native aquatic plants<br /> |Floodplain / River corridor=Native aquatic planted added<br /> |Social measures=Local consultation; volunteer community days<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36723 2016-03-01T12:53:35Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir notched; channel narrowing, bank reprofiling, addition of gravels and large woody material, native aquatic plants<br /> |Floodplain / River corridor=Native aquatic planted added<br /> |Social measures=Local consultation; volunteer community days<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36240 2016-02-09T15:45:44Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra,<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph.<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> <br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD.<br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored.<br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36239 2016-02-09T15:44:50Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.36809344333213, -0.16210089437663555<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2011/12/31<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36238 2016-02-09T15:44:07Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:River Wandle Restoration Project<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_restoration_project,_River_Wandle&diff=36237 2016-02-09T15:43:31Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Butter Hill restoration project, River Wandle to Case study:River Wandle Restoration Project</p> <hr /> <div>#REDIRECT [[Case study:River Wandle Restoration Project]]</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle_Restoration_Project&diff=36236 2016-02-09T15:43:30Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Butter Hill restoration project, River Wandle to Case study:River Wandle Restoration Project</p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.36769798793785, -0.1626598834991455<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Project web site url=www.wandletrust.org<br /> |Themes=Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org/<br /> |Partner organisations=Environment Agency, Wild Trout Trust, London Borough of Sutton, Defra, Thames Water,<br /> |Multi-site=Yes<br /> |Project picture=ButterhillPhase3 B4 and After WT Logo.png<br /> |Picture description=Carshalton Arm Restoration, © Wandle Trust<br /> |Project summary=Historically the River Wandle was a famous chalkstream trout fishery, with the Carshalton arm even lending its name to fishing techniques like the Carshalton Dodge. <br /> <br /> The Carshalton arm (a Water Framework Directive waterbody in its own right) in the headwaters was not only identified as strategically important spawning habitat but had the potential to sustain an isolated population if large downstream weirs could not be removed.<br /> <br /> However, the 1 km Carshalton waterbody was significantly degraded being overwide, disconnected and impounded by five weirs, over-shaded, contaminated with road runoff, with little habitat variation and limited fish populations. Hence this waterbody was selected for restoration and re-establishment of a wild trout population. <br /> <br /> Project Aim: To establish a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years.<br /> Objective: To rehabilitate the Carshalton waterbody by improving habitat diversity and quality, fish passage, hydromorphology and water quality; with wild trout used as the indicator species for the river’s recovery. <br /> <br /> This Scheme was delivered through a phased approach over six years. A breakdown can be found below of the different phases, with specific project details found on the individual case study pages. <br /> <br /> Butter Hill Phase 1: Working in partnership with the Environment Agency, 3 weirs were lowered. Habitat enhancement works were undertaken in the channel with the Wild Trout Trust as part of a practical training day in river restoration techniques for volunteers. A Larinier Fish Pass was installed on a 1.8 m weir downstream. <br /> <br /> Butter Hill Phase 2: A small weir which provided a barrier to fish passage and impounded the river for 50 m was notched. This improved fish passage by connecting up 2.5 km of river over two waterbodies. Upstream of the weir, the impounded section was replaced with a narrower channel and marginal shelf which enables the river to be more resilient to low flows and provides a small floodplain in a highly urbanised area. <br /> <br /> Butter Hill Phase 3: The weir at ButterHill was reduced in height by 1 m and the fish pass modified to increase efficiency. The length of impounded river was reduced by 150 m (15% of total waterbody length) and fish passage opened up for 500 m upstream (50% of the waterbody length).  A total of 500 m of river was narrowed and meandered with a low flow channel, berms, riffles, pools and marginal wetlands created along the length. Approximately 300 tonnes of gravel were added to restore geomorphology. Volunteers planted 2000 plants and coppiced trees to enhance light penetration.<br /> <br /> Silt &amp; SuDs: To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: Downstream Defenders, Siltex, Smart Sponges, Mycofilters and Rain Gardens.<br /> |Monitoring surveys and results=The transformation of the Carshalton arm of the River Wandle is a flagship project for what is possible in an urban environment. With both water and habitat quality having been addressed through the four phases, this section of river has been fully rehabilitated resulting in a diverse and functioning headwater with successful trout recruitment for the first time in over 80 years; achieving the overall project aim and its objectives. <br /> <br /> It has just been confirmed (July 2015) that this project has delivered all of the Mitigation Measures required to the enable the Carshalton waterbody to reach Good Ecological Potential. <br /> <br /> Fish Data: The EA has a monitoring site for the Carshalton arm at Butter Hill, where much of the work has been carried out. This provides a good time series of fish, invertebrate and plant data. <br /> <br /> Environment Agency electrofishing survey results show that there were no wild trout found in the area prior to 2006. Survey results from 2009 and 2011 find low numbers of trout, likely 2+ and 3+ individuals. However following works, in 2015 the story is much different with a Redd count of 10 (increased from 2 in 2012) providing evidence that suitable spawning habitat has been successfully increased. Excitingly, 67 0+ trout were found in the same survey site which shows that fish are not only spawning but successfully recruiting and that optimum juvenile habitat has been created.<br /> <br /> EA monitoring shows that other fish species have benefitted from the restoration work. Numbers of bullhead increased from 10-99 in 2011 to 1000+ in 2015. Similarly, three-spined sticklebacks also increased from 100-999 in 2012 to 1000+ in 2015.<br /> }}<br /> {{Image gallery}}<br /> {{Case study image<br /> |File name=TroutreddCarshalton.jpg<br /> |Caption=Trout spawning on the Carshalton arm, November 2012, © T. Longstaff (Wandle Trust)<br /> }}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |Name=Butter Hill, Carshalton<br /> |WFD water body code=GB106039017640<br /> |WFD (national) typology=Low, Small, Calcareous, <br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Pre-project morphology=Over deepened, Over-widened, Ponded, Straightened, <br /> |Reference morphology=Pool-riffle, <br /> |Heavily modified water body=Yes<br /> |Protected species present=No<br /> |Invasive species present=No<br /> |Dominant hydrology=Flashy, Artificially regulated, <br /> |Dominant substrate=Gravel, Silt, Bedrock, <br /> |Average bankfull channel width category=2 - 5 m<br /> |Average bankfull channel depth category=0.5 - 2 m<br /> |Mean discharge category=1 - 10 m³/s<br /> }}<br /> {{Project background<br /> |Reach length directly affected=1500<br /> |Project started=2008/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2012/09/01<br /> |Project completed=2012/12/01<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Flood risk management, Barriers to fish migration,<br /> |Hydromorphological quality elements=Channel pattern/planform, Continuity of sediment transport, Quantity &amp; dynamics of flow, Substrate conditions, Width &amp; depth variation, <br /> |Biological quality elements=Invertebrates, Fish, <br /> |Physico-chemical quality elements=Temperature, <br /> |Other motivation=Community demand, <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Introducting large woody debris, Bank re-grading, Creation of deflectors, Removal of weirs, Habitat diversification, Restoring riparian vegetation <br /> |Floodplain / River corridor=Control of invasive species,<br /> |Planform / Channel pattern=Allow future natural channel changes to occur, Assessment and monitoring program, Channel naturalisation; Creation of new meandering channel, Establishment of fish passage, Improvement of channel morphology, Removal of a weir<br /> |Social measures=Awareness campaigns, 'Trout in the Town' project raising the awareness of the river's value in schools, Citizen participation in the restoration project, Communication and dissemination program of environmental problems in the area<br /> |Wider stakeholder / citizen engagement=Public consultation, Participation in works, Participation in maintenance,<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Wandle_Trout_Restoration&diff=36235 2016-02-09T15:42:34Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Wandle Trout Restoration to Case study:River Wandle: Butter Hill Phase 1</p> <hr /> <div>#REDIRECT [[Case study:River Wandle: Butter Hill Phase 1]]</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36234 2016-02-09T15:42:33Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Wandle Trout Restoration to Case study:River Wandle: Butter Hill Phase 1</p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.36809344333213, -0.16210089437663555<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2011/12/31<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Wandle_River_Restoration_Project&diff=36233 2016-02-09T15:42:08Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Wandle River Restoration Project to Case study:River Wandle: Silt &amp; SuDs</p> <hr /> <div>#REDIRECT [[Case study:River Wandle: Silt &amp; SuDs]]</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36232 2016-02-09T15:42:07Z

<p>Pollygwenbryant: Pollygwenbryant moved page Case study:Wandle River Restoration Project to Case study:River Wandle: Silt &amp; SuDs</p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra,<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph.<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> <br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD.<br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored.<br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36228 2016-02-09T15:32:10Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.37121803310038, -0.1597298216074705<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> <br /> <br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36227 2016-02-09T15:31:39Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.36809344333213, -0.16210089437663555<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2011/12/31<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Ravensbury_Park_back_channel&diff=36226 2016-02-09T15:22:22Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3984718322753, -0.183413088321686<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Habitat and biodiversity, Social benefits<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Defra, London Borough of Merton, Living Wandle Landscape Partnership, <br /> |Multi-site=No<br /> |Project picture=Graphic.png<br /> |Picture description=Ravensbury Park Back Channel © Wandle Trust<br /> |Project summary=This project is one of four sites delivered through the Defra Catchment Restoration Fund.<br /> <br /> A total of 100 m of river corridor was improved. <br /> <br /> Throughout the site toe boarding was removed and the bank renaturalised to create marginal habitat. A low flow channel was created using faggot bundles and coir rolls with the new banks planted up by local volunteers. <br /> <br /> Large Woody Material (LWM) was installed to further increase flow diversity. <br /> <br /> A number of bat hotels and bird boxes were installed in the surrounding green space with volunteers. <br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Croydon to Wandsworth) and the R. Gravney<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039023460<br /> |WFD water body name=Wandle (Croydon to Wandsworth) and the R. Gravney<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=50 m<br /> |Project started=2010/01/01<br /> |Works completed=2011/01/01<br /> |Total cost category=1 - 10 k€<br /> |Funding sources=Wandle Piscators, Wandle Trust <br /> }}<br /> {{Motivations<br /> |Specific mitigation=Riparian development<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Bank reprofiling, Installation of coir rolls, Deflectors<br /> |Floodplain / River corridor=Tree management<br /> |Planform / Channel pattern=Creation of backwater<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:Graphic.png&diff=36225 2016-02-09T15:15:19Z

<p>Pollygwenbryant: </p> <hr /> <div></div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Hackbridge_weir_notch&diff=36224 2016-02-09T15:11:46Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3763236999511, -0.157948195934296<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Project web site url=http://www.wandletrust.org/habitat-restoration-coir-rolls-at-hackbridge/<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Piscators, Environment Agency, <br /> |Multi-site=No<br /> |Project summary=Working with Wandle Piscators and the Environment Agency, 39 metres of coir rolls were installed at Hackbridge to soften the concrete bank edge. Works were completed with 34 local volunteers. <br /> <br /> <br /> <br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Croydon to Wandsworth) and the R. Gravney<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039023460<br /> |WFD water body name=Wandle (Croydon to Wandsworth) and the R. Gravney<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=250 m<br /> |Project started=2008/01/01<br /> |Total cost category=100 - 500 k€<br /> |Funding sources=Landfill (Viridor), Thames Water Settlement, EA, Wandle Piscators <br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Width &amp; depth variation<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Deflectors, Installation of coir rolls, Removing of sediments<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Wandle_River_Restoration_Project:_Hackbridge&diff=36223 2016-02-09T15:00:31Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.377131, -0.160390<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Habitat and biodiversity, Hydromorphology, Social benefits<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Main contact id=Pollygwenbryant<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Defra Catchment Restoration Fund, Environment Agency, Rydon's Construction, Living Wandle Landscape Partnership<br /> |Multi-site=No<br /> |Project picture=Hackbridge Before, During and After.png<br /> |Picture description=Hackbridge Restoration © Wandle Trust<br /> |Project summary=This project is one of four sites delivered through the Defra Catchment Restoration Fund. <br /> <br /> Designs were developed based on detailed 2D flood modelling undertaken in conjunction with cbec eco-engineering. Practical works were delivered during Summer 2014 with appointed contractors, Cain Bioengineering. <br /> <br />  <br /> The work started with the removal of old toe-boarding from around the edge of Culvers Island. The island was re-profiled with a new bank line created using hazel faggot bundles secured with chestnut stakes and backed with coir netting. Sediment from the channel was then placed behind the new bank line.  <br /> <br />  <br /> The weir structures either side of the island were removed and the river channel narrowed using a combination of chestnut posts and hazel faggot bundles or gabion stone.<br /> <br />  <br /> A causeway was built to create a backwater pond area using coir geotextile layered over a bed of stone and weighed down with gravel and sediment and planted with aquatic plants. The new island banks were re-graded to create a gradually sloped bank to which a variety of aquatic vegetation was planted with a team of 60 volunteers over three days.<br /> <br />  <br /> Variations in depth, width and the introduction of gravel, small boulders and Large Woody Debris have all provided a diversity of habitats and increased the flow diversity of the channel throughout the site. <br /> <br /> <br /> |Lessons learn=Challenges: <br /> <br /> - Very urban nature of the site. Complex flood modelling and design was required.<br /> <br /> - Multiple underground utilities which had to be identified and avoided during the works.<br /> <br /> - Many and varied stakeholder needs and opinions.<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/09/01<br /> }}<br /> {{Motivations}}<br /> {{Measures<br /> |Bank and bed modifications measure=Creation of fish passes, Habitat diversification, <br /> |Floodplain / River corridor=Wetland created, <br /> |Planform / Channel pattern=Increase in-channel hydromorphological diversity, <br /> |Social measures=Community involvement, Aesthetics, <br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:Hackbridge_Before,_During_and_After.png&diff=36222 2016-02-09T14:57:40Z

<p>Pollygwenbryant: </p> <hr /> <div></div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36221 2016-02-09T14:46:19Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra,<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph.<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> <br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD.<br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored.<br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_3&diff=36220 2016-02-09T14:45:21Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.370370764554885, -0.15993366949260235<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, Defra, Thames Water, National Lottery's Heritage Lottery Fund<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project picture=Butter Hill Phase 3.png<br /> |Picture description=Before &amp; After Butter Hill Phase 3 Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> Flood risk and hydraulic assessment of the weir and fish pass were carried out in conjunction with Matt Horritt Consulting. Works were delivered with the help of appointed contractors Aquamaintain Ltd under the supervision of South East Rivers Trust staff. <br />  <br /> The weir at Butter Hill bridge was partially lowered to restore natural flow to the upstream channel and the fish pass modified to improve its efficiency. <br /> <br /> Upstream of the weir the over-straight, over-wide channel was narrowed and modified to create a meandering sequence using a combination of gravel, hazel faggots, chestnut posts and coir geotextile with silt from the channel and brash as backfill. <br />  <br /> The banks on both sides of the channel were then re-graded to create marginal and transitional habitats. A variety of marginal plant species were introduced to assist with naturalisation by a team of 15 volunteers. <br /> <br /> Downstream, for 300 m, channel narrowing and meandering was continued and gravel and Large Woody Debris was introduced along the whole reach to further diversify the river flow and replicate natural hydromorphological processes, creating habitats for invertebrates and all life stages of fish. <br /> <br /> Trees were also removed in phases over a two year period to increase light in selected places and encourage plant growth along the whole 500 m reach.<br /> <br /> <br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:Butter_Hill_Phase_3.png&diff=36219 2016-02-09T14:44:25Z

<p>Pollygwenbryant: </p> <hr /> <div></div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_3&diff=36218 2016-02-09T14:36:01Z

<p>Pollygwenbryant: Created page with &quot;{{Case study status |Approval status=Draft }} {{Location |Location=51.370370764554885, -0.15993366949260235 }} {{Project overview |Project title=River Wandle: Butter Hill Phas...&quot;</p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.370370764554885, -0.15993366949260235<br /> }}<br /> {{Project overview<br /> |Project title=River Wandle: Butter Hill Phase 3<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Multi-site=No<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36217 2016-02-09T14:33:59Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.368764799145474, -0.1610929286107421<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project picture=Butterhill Phase 2 Before and Afters.png<br /> |Picture description=Before and After of Restoration Works © Wandle Trust<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The weir at Millpond Place was notched to restore natural flow to the upstream channel. <br />  <br /> The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes. <br /> <br /> Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  <br /> <br /> Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants. <br />  <br /> Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.<br /> <br /> <br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> |Lessons learn=- Urban nature of the site<br /> <br /> - Getting some local, neighbouring residents to understand and buy in to the project was difficult<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:Butterhill_Phase_2_Before_and_Afters.png&diff=36216 2016-02-09T14:31:17Z

<p>Pollygwenbryant: </p> <hr /> <div></div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:Butter_Hill_Phase_2&diff=36215 2016-02-09T14:27:38Z

<p>Pollygwenbryant: Created page with &quot;{{Case study status |Approval status=Draft }} {{Location |Location=51.368764799145474, -0.1610929286107421 }} {{Project overview |Project title=Butter Hill Phase 2 |Status=Com...&quot;</p> <hr /> <div>{{Case study status<br /> |Approval status=Draft<br /> }}<br /> {{Location<br /> |Location=51.368764799145474, -0.1610929286107421<br /> }}<br /> {{Project overview<br /> |Project title=Butter Hill Phase 2<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity, Social benefits, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Multi-site=No<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> }}<br /> {{Image gallery}}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment}}<br /> {{Site}}<br /> {{Project background}}<br /> {{Motivations}}<br /> {{Measures}}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle_Restoration_Project&diff=36214 2016-02-09T14:23:17Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.36769798793785, -0.1626598834991455<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Project web site url=www.wandletrust.org<br /> |Themes=Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org/<br /> |Partner organisations=Environment Agency, Wild Trout Trust, London Borough of Sutton, Defra, Thames Water,<br /> |Multi-site=Yes<br /> |Project picture=ButterhillPhase3 B4 and After WT Logo.png<br /> |Picture description=Carshalton Arm Restoration, © Wandle Trust<br /> |Project summary=Historically the River Wandle was a famous chalkstream trout fishery, with the Carshalton arm even lending its name to fishing techniques like the Carshalton Dodge. <br /> <br /> The Carshalton arm (a Water Framework Directive waterbody in its own right) in the headwaters was not only identified as strategically important spawning habitat but had the potential to sustain an isolated population if large downstream weirs could not be removed.<br /> <br /> However, the 1 km Carshalton waterbody was significantly degraded being overwide, disconnected and impounded by five weirs, over-shaded, contaminated with road runoff, with little habitat variation and limited fish populations. Hence this waterbody was selected for restoration and re-establishment of a wild trout population. <br /> <br /> Project Aim: To establish a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years.<br /> Objective: To rehabilitate the Carshalton waterbody by improving habitat diversity and quality, fish passage, hydromorphology and water quality; with wild trout used as the indicator species for the river’s recovery. <br /> <br /> This Scheme was delivered through a phased approach over six years. A breakdown can be found below of the different phases, with specific project details found on the individual case study pages. <br /> <br /> Butter Hill Phase 1: Working in partnership with the Environment Agency, 3 weirs were lowered. Habitat enhancement works were undertaken in the channel with the Wild Trout Trust as part of a practical training day in river restoration techniques for volunteers. A Larinier Fish Pass was installed on a 1.8 m weir downstream. <br /> <br /> Butter Hill Phase 2: A small weir which provided a barrier to fish passage and impounded the river for 50 m was notched. This improved fish passage by connecting up 2.5 km of river over two waterbodies. Upstream of the weir, the impounded section was replaced with a narrower channel and marginal shelf which enables the river to be more resilient to low flows and provides a small floodplain in a highly urbanised area. <br /> <br /> Butter Hill Phase 3: The weir at ButterHill was reduced in height by 1 m and the fish pass modified to increase efficiency. The length of impounded river was reduced by 150 m (15% of total waterbody length) and fish passage opened up for 500 m upstream (50% of the waterbody length).  A total of 500 m of river was narrowed and meandered with a low flow channel, berms, riffles, pools and marginal wetlands created along the length. Approximately 300 tonnes of gravel were added to restore geomorphology. Volunteers planted 2000 plants and coppiced trees to enhance light penetration.<br /> <br /> Silt &amp; SuDs: To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: Downstream Defenders, Siltex, Smart Sponges, Mycofilters and Rain Gardens.<br /> |Monitoring surveys and results=The transformation of the Carshalton arm of the River Wandle is a flagship project for what is possible in an urban environment. With both water and habitat quality having been addressed through the four phases, this section of river has been fully rehabilitated resulting in a diverse and functioning headwater with successful trout recruitment for the first time in over 80 years; achieving the overall project aim and its objectives. <br /> <br /> It has just been confirmed (July 2015) that this project has delivered all of the Mitigation Measures required to the enable the Carshalton waterbody to reach Good Ecological Potential. <br /> <br /> Fish Data: The EA has a monitoring site for the Carshalton arm at Butter Hill, where much of the work has been carried out. This provides a good time series of fish, invertebrate and plant data. <br /> <br /> Environment Agency electrofishing survey results show that there were no wild trout found in the area prior to 2006. Survey results from 2009 and 2011 find low numbers of trout, likely 2+ and 3+ individuals. However following works, in 2015 the story is much different with a Redd count of 10 (increased from 2 in 2012) providing evidence that suitable spawning habitat has been successfully increased. Excitingly, 67 0+ trout were found in the same survey site which shows that fish are not only spawning but successfully recruiting and that optimum juvenile habitat has been created.<br /> <br /> EA monitoring shows that other fish species have benefitted from the restoration work. Numbers of bullhead increased from 10-99 in 2011 to 1000+ in 2015. Similarly, three-spined sticklebacks also increased from 100-999 in 2012 to 1000+ in 2015.<br /> }}<br /> {{Image gallery}}<br /> {{Case study image<br /> |File name=TroutreddCarshalton.jpg<br /> |Caption=Trout spawning on the Carshalton arm, November 2012, © T. Longstaff (Wandle Trust)<br /> }}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |Name=Butter Hill, Carshalton<br /> |WFD water body code=GB106039017640<br /> |WFD (national) typology=Low, Small, Calcareous, <br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Pre-project morphology=Over deepened, Over-widened, Ponded, Straightened, <br /> |Reference morphology=Pool-riffle, <br /> |Heavily modified water body=Yes<br /> |Protected species present=No<br /> |Invasive species present=No<br /> |Dominant hydrology=Flashy, Artificially regulated, <br /> |Dominant substrate=Gravel, Silt, Bedrock, <br /> |Average bankfull channel width category=2 - 5 m<br /> |Average bankfull channel depth category=0.5 - 2 m<br /> |Mean discharge category=1 - 10 m³/s<br /> }}<br /> {{Project background<br /> |Reach length directly affected=1500<br /> |Project started=2008/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2012/09/01<br /> |Project completed=2012/12/01<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Flood risk management, Barriers to fish migration,<br /> |Hydromorphological quality elements=Channel pattern/planform, Continuity of sediment transport, Quantity &amp; dynamics of flow, Substrate conditions, Width &amp; depth variation, <br /> |Biological quality elements=Invertebrates, Fish, <br /> |Physico-chemical quality elements=Temperature, <br /> |Other motivation=Community demand, <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Introducting large woody debris, Bank re-grading, Creation of deflectors, Removal of weirs, Habitat diversification, Restoring riparian vegetation <br /> |Floodplain / River corridor=Control of invasive species,<br /> |Planform / Channel pattern=Allow future natural channel changes to occur, Assessment and monitoring program, Channel naturalisation; Creation of new meandering channel, Establishment of fish passage, Improvement of channel morphology, Removal of a weir<br /> |Social measures=Awareness campaigns, 'Trout in the Town' project raising the awareness of the river's value in schools, Citizen participation in the restoration project, Communication and dissemination program of environmental problems in the area<br /> |Wider stakeholder / citizen engagement=Public consultation, Participation in works, Participation in maintenance,<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:ButterhillPhase3_B4_and_After_WT_Logo.png&diff=36213 2016-02-09T14:22:57Z

<p>Pollygwenbryant: </p> <hr /> <div></div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36212 2016-02-09T14:22:02Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3703956604003, -0.159843116998672<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Name of parent multi-site project=Case_study:Butter Hill restoration project, River Wandle<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2011/12/31<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle_Restoration_Project&diff=36211 2016-02-09T14:19:09Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.36769798793785, -0.1626598834991455<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Project web site url=www.wandletrust.org<br /> |Themes=Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Tim<br /> |Main contact surname=Longstaff<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org/<br /> |Partner organisations=Environment Agency, Wild Trout Trust, London Borough of Sutton, Defra, Thames Water, <br /> |Multi-site=Yes<br /> |Project picture=WandleCarshalton.jpg<br /> |Picture description=Carshalton arm restoration, 2010 © T. Pike, Wandle Trust<br /> |Project summary=Historically the River Wandle was a famous chalkstream trout fishery, with the Carshalton arm even lending its name to fishing techniques like the Carshalton Dodge. <br /> <br /> The Carshalton arm (a Water Framework Directive waterbody in its own right) in the headwaters was not only identified as strategically important spawning habitat but had the potential to sustain an isolated population if large downstream weirs could not be removed.<br /> <br /> However, the 1 km Carshalton waterbody was significantly degraded being overwide, disconnected and impounded by five weirs, over-shaded, contaminated with road runoff, with little habitat variation and limited fish populations. Hence this waterbody was selected for restoration and re-establishment of a wild trout population. <br /> <br /> Project Aim: To establish a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years.<br /> Objective: To rehabilitate the Carshalton waterbody by improving habitat diversity and quality, fish passage, hydromorphology and water quality; with wild trout used as the indicator species for the river’s recovery. <br /> <br /> This Scheme was delivered through a phased approach over six years. A breakdown can be found below of the different phases, with specific project details found on the individual case study pages. <br /> <br /> Butter Hill Phase 1: Working in partnership with the Environment Agency, 3 weirs were lowered. Habitat enhancement works were undertaken in the channel with the Wild Trout Trust as part of a practical training day in river restoration techniques for volunteers. A Larinier Fish Pass was installed on a 1.8 m weir downstream. <br /> <br /> Butter Hill Phase 2: A small weir which provided a barrier to fish passage and impounded the river for 50 m was notched. This improved fish passage by connecting up 2.5 km of river over two waterbodies. Upstream of the weir, the impounded section was replaced with a narrower channel and marginal shelf which enables the river to be more resilient to low flows and provides a small floodplain in a highly urbanised area. <br /> <br /> Butter Hill Phase 3: The weir at ButterHill was reduced in height by 1 m and the fish pass modified to increase efficiency. The length of impounded river was reduced by 150 m (15% of total waterbody length) and fish passage opened up for 500 m upstream (50% of the waterbody length).  A total of 500 m of river was narrowed and meandered with a low flow channel, berms, riffles, pools and marginal wetlands created along the length. Approximately 300 tonnes of gravel were added to restore geomorphology. Volunteers planted 2000 plants and coppiced trees to enhance light penetration.<br /> <br /> Silt &amp; SuDs: To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: Downstream Defenders, Siltex, Smart Sponges, Mycofilters and Rain Gardens. <br /> <br /> <br /> <br /> <br /> |Monitoring surveys and results=The transformation of the Carshalton arm of the River Wandle is a flagship project for what is possible in an urban environment. With both water and habitat quality having been addressed through the four phases, this section of river has been fully rehabilitated resulting in a diverse and functioning headwater with successful trout recruitment for the first time in over 80 years; achieving the overall project aim and its objectives. <br /> <br /> It has just been confirmed (July 2015) that this project has delivered all of the Mitigation Measures required to the enable the Carshalton waterbody to reach Good Ecological Potential. <br /> <br /> Fish Data: The EA has a monitoring site for the Carshalton arm at Butter Hill, where much of the work has been carried out. This provides a good time series of fish, invertebrate and plant data. <br /> <br /> Environment Agency electrofishing survey results show that there were no wild trout found in the area prior to 2006. Survey results from 2009 and 2011 find low numbers of trout, likely 2+ and 3+ individuals. However following works, in 2015 the story is much different with a Redd count of 10 (increased from 2 in 2012) providing evidence that suitable spawning habitat has been successfully increased. Excitingly, 67 0+ trout were found in the same survey site which shows that fish are not only spawning but successfully recruiting and that optimum juvenile habitat has been created.<br /> <br /> EA monitoring shows that other fish species have benefitted from the restoration work. Numbers of bullhead increased from 10-99 in 2011 to 1000+ in 2015. Similarly, three-spined sticklebacks also increased from 100-999 in 2012 to 1000+ in 2015. <br /> <br /> }}<br /> {{Image gallery}}<br /> {{Case study image<br /> |File name=TroutreddCarshalton.jpg<br /> |Caption=Trout spawning on the Carshalton arm, November 2012, © T. Longstaff (Wandle Trust)<br /> }}<br /> {{Image gallery end}}<br /> {{Toggle button}}<br /> {{Toggle content start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |Name=Butter Hill, Carshalton<br /> |WFD water body code=GB106039017640<br /> |WFD (national) typology=Low, Small, Calcareous, <br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Pre-project morphology=Over deepened, Over-widened, Ponded, Straightened, <br /> |Reference morphology=Pool-riffle, <br /> |Heavily modified water body=Yes<br /> |Protected species present=No<br /> |Invasive species present=No<br /> |Dominant hydrology=Flashy, Artificially regulated, <br /> |Dominant substrate=Gravel, Silt, Bedrock, <br /> |Average bankfull channel width category=2 - 5 m<br /> |Average bankfull channel depth category=0.5 - 2 m<br /> |Mean discharge category=1 - 10 m³/s<br /> }}<br /> {{Project background<br /> |Reach length directly affected=1500<br /> |Project started=2008/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2012/09/01<br /> |Project completed=2012/12/01<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Flood risk management, Barriers to fish migration,<br /> |Hydromorphological quality elements=Channel pattern/planform, Continuity of sediment transport, Quantity &amp; dynamics of flow, Substrate conditions, Width &amp; depth variation, <br /> |Biological quality elements=Invertebrates, Fish, <br /> |Physico-chemical quality elements=Temperature, <br /> |Other motivation=Community demand, <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Introducting large woody debris, Bank re-grading, Creation of deflectors, Removal of weirs, Habitat diversification, Restoring riparian vegetation <br /> |Floodplain / River corridor=Control of invasive species,<br /> |Planform / Channel pattern=Allow future natural channel changes to occur, Assessment and monitoring program, Channel naturalisation; Creation of new meandering channel, Establishment of fish passage, Improvement of channel morphology, Removal of a weir<br /> |Social measures=Awareness campaigns, 'Trout in the Town' project raising the awareness of the river's value in schools, Citizen participation in the restoration project, Communication and dissemination program of environmental problems in the area<br /> |Wider stakeholder / citizen engagement=Public consultation, Participation in works, Participation in maintenance,<br /> }}<br /> {{Hydromorphological quality elements header}}<br /> {{End table}}<br /> {{Biological quality elements header}}<br /> {{End table}}<br /> {{Physico-chemical quality elements header}}<br /> {{End table}}<br /> {{Other responses header}}<br /> {{End table}}<br /> {{Monitoring documents}}<br /> {{Monitoring documents end}}<br /> {{Additional Documents}}<br /> {{Additional Documents end}}<br /> {{Additional links and references header}}<br /> {{Additional links and references footer}}<br /> {{Supplementary Information}}<br /> {{Toggle content end}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36203 2016-02-09T12:52:58Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra,<br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph.<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> <br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD.<br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored.<br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36202 2016-02-09T12:51:20Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra,<br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph.<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD.<br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored.<br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Silt_%26_SuDs&diff=36201 2016-02-09T12:50:38Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case study status<br /> |Approval status=Approved<br /> }}<br /> {{Location<br /> |Location=51.3706855773925, -0.159609228372574<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Water quality, Urban<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Environment Agency, London Borough of Sutton, Queen Mary University of London, Thames Water, Defra, <br /> |Multi-site=No<br /> |Project picture=Siltex + Logo.png<br /> |Picture description=Volunteers adding Siltex to Carshalton Ponds in November 2014. Please seek permission from the Wandle Trust to reuse this photograph. <br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;.<br /> <br /> The overall aim of this Project was to trial and evaluate innovative control measures for mitigation of urban diffuse pollution in an urban environment. <br /> <br /> The River Wandle turned black with road runoff every time it rained and whilst Environment Agency data did not detect a problem (due to spot sampling rather than continuous monitoring methods), the Trust suspected river sediments were contaminated and the first flush after rain caused fluctuating water quality, likely limiting the successful recruitment of trout. <br /> <br /> The Trust worked with an MSc student from Queen Mary University and confirmed that copper and 15 types of PAH were at a level that would have a severe effect on aquatic biota. <br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:<br /> <br /> To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff: <br /> <br /> 1. Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge.<br /> 2. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal force. <br /> 3. Mycofilters are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. A total of 180 mycofilters were made and grown by a team of volunteers, installed in 4 locations on the lower Wandle. <br /> 4. Siltex is a natural chalk-like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Working with local volunteers, Siltex was added to Carshalton Ponds in November 2014 and samples taken for the proceeding months to determine the effectiveness. <br /> 5. Smart Sponges are a commercial product specially designed to absorb oils mixed in water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers. A total of 23 Smart Sponges were installed in gully pots along the catchment of one surface water drain linking to a DD. <br /> <br /> <br /> <br /> |Monitoring surveys and results=For wider project benefits as part of the larger &quot;River Wandle Restoration Scheme&quot; please see the parent project. <br /> <br /> Monitoring was completed for Mycofilters, Siltex, Smart Sponges and Downstream Defenders. <br /> <br /> Downstream Defenders: A Downstream Defender (DD) was monitored using upstream and downstream flow meters and water samples were taken using autosamplers during heavy rainfall events. Samples were sent to a UKAS accredited lab to be analysed, and contaminant load was calculated. The surface water pipe along which the DD was positioned had unexpectedly high flows (up to 50 l/s). When flows were within the operating range of the DD it was effective at removing around 47% of Total Suspended Solids (TSS), however, over the a whole data period it removed 9%. These numbers are within the range found by Dr Thomas Curwell, who investigated multiple rainfall events in DDs and found that they were effective in removing 9-49% TSS. Despite the low removal inefficiencies, the units remain the most effective measure if only a few square meters are available to SERT's knowledge, and are likely to have a cumulatively positive effect. The Trust are currently working on a sediment trap-wetland treatment train in an area where there is more space as an alternative method, following promising results from the scientific literature. <br /> <br /> Mycofilters: Upstream and downstream water samples were taken for Mycofilter sites and control sites (using straw bags with no oyster mushroom). <br /> <br /> Smart Sponges: The concentration of hydrocarbons collected in the gully pots with and without the sponges is being monitored.<br /> <br /> Siltex: Silt and water are being monitored. <br /> |Lessons learn=Challenges:<br /> <br /> - Identify spaces for DDs underground amongst utilities.<br /> <br /> - Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.<br /> <br /> - Getting commitment from parties to empty the DDs.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Project started=2012/07/01<br /> |Project completed=2015/03/31<br /> |Funding sources=Defra Catchment Restoration Fund<br /> }}<br /> {{Motivations<br /> |Hydromorphological quality elements=<br /> <br /> <br /> Substrate conditions<br /> |Biological quality elements=<br /> <br /> |Physico-chemical quality elements=<br /> <br /> |Specific mitigation=<br /> Pollution incident, Flood risk management, Urbanisation<br /> |Other motivation=<br /> <br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=<br /> <br /> <br /> Reduce diffuse pollution,<br /> |Floodplain / River corridor=<br /> <br /> |Planform / Channel pattern=<br /> <br /> |Other technical measure=<br /> <br /> |Management interventions=<br /> <br /> |Social measures=<br /> Community involvement<br /> |Wider stakeholder / citizen engagement=<br /> <br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring documents}}<br /> {{Case study monitoring documents<br /> |Monitoring document=TH002 monitoring framework table.docx<br /> |Description=RRC Monitoring table - Wandle<br /> }}<br /> {{Monitoring_documents_end}}<br /> {{Additional Documents}}<br /> {{Case study documents<br /> |File name=CRF009 Project Briefing Note - Wandle River Restoration.pdf<br /> |Description=CRF Project briefing note - Wandle<br /> }}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=File:Siltex_%2B_Logo.png&diff=36200 2016-02-09T12:49:59Z

<p>Pollygwenbryant: Volunteers applying Siltex to Carshalton Ponds in November 2014. Please contact Wandle Trust for photo permision if you wish to use.</p> <hr /> <div>Volunteers applying Siltex to Carshalton Ponds in November 2014. <br /> Please contact Wandle Trust for photo permision if you wish to use.</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36199 2016-02-09T12:29:37Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3703956604003, -0.159843116998672<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Works started=2010/01/01<br /> |Works completed=2011/12/31<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36197 2016-02-09T12:27:10Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3703956604003, -0.159843116998672<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency,<br /> |Multi-site=No<br /> |Project summary=This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project &quot;River Wandle Restoration Project&quot;. <br /> <br /> This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers. <br />  <br /> The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.<br /> <br /> The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.<br /> <br /> The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.<br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.<br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant https://restorerivers.eu/wiki/index.php?title=Case_study:River_Wandle:_Butter_Hill_Phase_1&diff=36194 2016-02-09T12:22:37Z

<p>Pollygwenbryant: </p> <hr /> <div>{{Case_study_status<br /> |Approval status=<br /> <br /> <br /> <br /> <br /> <br /> <br /> Draft<br /> }}<br /> {{Location<br /> |Location=51.3703956604003, -0.159843116998672<br /> }}<br /> {{Project overview<br /> |Status=Complete<br /> |Themes=Fisheries, Habitat and biodiversity<br /> |Country=England<br /> |Main contact forename=Bella<br /> |Main contact surname=Davies<br /> |Contact organisation=Wandle Trust<br /> |Contact organisation url=www.wandletrust.org<br /> |Partner organisations=Wandle Trust, Wild Trout Trust, Sutton County Council, Environment Agency, <br /> |Multi-site=No<br /> |Project summary=This was the first phase in the larger River Wandle Restoration Project with the overall aim to establish a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years.<br /> <br /> The overall objective of this larger project was to rehabilitate the Carshalton waterbody by improving habitat diversity and quality, fish passage, hydromorphology and water quality; with wild trout used as the indicator species for the river’s recovery. <br /> <br /> <br /> In 2010, the gradual lowering of 3 the three stabilising weirs was undertaken in partnership with the EA to improve both fish passage and flow regime. The EA also installed a Larinier Fish Pass on a large weir at Butter Hill Bridge but due to unforeseen site restrictions the pass was ineffective without modification.<br /> <br /> To compliment this work, the Wild Trout Trust (WTT) led a Practical Visit to enhance in-channel habitat and train Wandle Trust staff and 50 volunteers from the local community and TITT projects from around the country in river enhancement techniques. Large Woody Debris (LWD) was installed to produce good quality habitat for trout at all life stages: scoured spawning gravels, holding lies for adult trout and cover suitable for juvenile life stages of trout. <br /> |Monitoring surveys and results=Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases. <br /> }}<br /> {{Image_gallery}}<br /> {{Image_gallery_end}}<br /> {{Toggle_button}}<br /> {{Toggle_content_start}}<br /> {{Case study subcatchment<br /> |Subcatchment=Wandle (Carshalton Branch at Carshalton)<br /> }}<br /> {{Site<br /> |WFD water body code=GB106039017640<br /> |WFD water body name=Wandle (Carshalton Branch at Carshalton)<br /> |Heavily modified water body=No<br /> |Protected species present=No<br /> |Invasive species present=No<br /> }}<br /> {{Project background<br /> |Reach length directly affected=360 m<br /> |Project started=2009/01/01<br /> |Total cost category=10 - 50 k€<br /> |Funding sources=Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA<br /> }}<br /> {{Motivations<br /> |Specific mitigation=Barriers to fish migration<br /> |Hydromorphological quality elements=Continuity for organisms, Quantity &amp; dynamics of flow<br /> |Biological quality elements=Fish<br /> }}<br /> {{Measures<br /> |Bank and bed modifications measure=Weir improvement<br /> |Planform / Channel pattern=Installation of fish pass<br /> }}<br /> {{Hydromorphological_quality_elements_header}}<br /> {{End_table}}<br /> {{Biological_quality_elements_header}}<br /> {{End_table}}<br /> {{Physico-chemical_quality_elements_header}}<br /> {{End_table}}<br /> {{Other_responses_header}}<br /> {{End_table}}<br /> {{Monitoring_documents}}<br /> {{Monitoring_documents_end}}<br /> {{Additional_Documents}}<br /> {{Additional_Documents_end}}<br /> {{Additional_links_and_references_header}}<br /> {{Additional_links_and_references_footer}}<br /> {{Supplementary_Information<br /> |Information=<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> }}<br /> {{Toggle_content_end}}<br /> {{Case_study_upload}}</div>

Pollygwenbryant