Property:Project summary
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Z
The Zújar project is part of the National Strategy for River Restoration (an initiative of the Ministry of Environment, developed in the Zújar River by the Confederación Hidrográfica del Guadiana) and the State Special Fund to Revitalize Economy and Jobs (Plan E). The full project covers 30 km of the river, and to facilitate the execution of the works it was divided into four sub-projects.
The main objectives of the project were: restoration and conservation of riparian vegetation; restoration of the longitudinal and lateral connectivity of the fluvial ecosystem; preservation of the Public Hydraulic Domain from new pressures; environmental education and awareness through the development of outreach activities; enable wildlife mobility; monitoring the biological and physical factors of the reach. The total budget to carry out the rehabilitation and restoration of 30 Km of the Zújar river was 16.240.282 €. The extent of the project is limited to the Public Hydraulic Domain as the first stage of what could be -thanks to land acquisition- a more ambitious floodplain restoration project. +
R
The action described is part of a more extensive project that aims the complete restoration of the stream of Vallvidrera with the objective to improve the ecological quality of this stream.
The specific objectives of this project are: To improve the structure and diversity of plant communities, ensure the stability of margins minimize the erosive effects, eliminate bottleneck in the bed that may affect adjacent spaces during floods, increasing the capacity of self-purification of the stream.
The project has a total budget of 37.164,74 € and is financed by Collserola Park Consortium. +
The activity of the Nitrokémia chemical industry was recently terminated, but it's sewage waters left the Séd-Nádor stream along a 125 km long section polluted by toxic metals, which pose a significant environmental risk caused mainly by mercury, cadmium and lead. The aim of the project is to restore and rehabilitate the Séd-Nádor stream by removing the polluted sludge, creating structures in the streambed and by the recultivation of the banks and surrounding area. All interventions are based on an ecological and human health risk assessment. +
W
The advent of the proactive stage of the Water Framework Directive has allowed some funding to be channelled to the Wye through two sources:
• The Association of Rivers Trusts
• Environment Agency
This aim of the funding is to improve failing water bodies, for example: those where fish are prevented from accessing; those with habitat issues and those suffering from diffuse pollution.
WUF completed three WFD funded projects and assisted with a fourth in partnership with the Monnow Fisheries Association.
The Arrow Access Project
This takes forward the work done in Leader + to secure access for salmon and trout to the middle and upper reaches of the river. There were four fish passes built in 2010.
River Garren Access Project
In 2010, we started creating fish access on the Garren which enters the Wye near Goodrich. In that yea blocked the river, the lowering of another and easement of two other potential obstacles.
The third WFD funded project report may be viewed by accessing http://www.wyeuskfoundation.org/projects/Report-for-EA-of-WFD-Project.pdf. The final WFD project is still progressing and details will be posted when complete. +
M
The ageing mill weir at Riding Mill on the March Burn had become a serious barrier to fish migration. The difference in water levels upstream to downstream was 1000mm. Although large salmon can leap higher than this in certain circumstances, the very shallow water and the wide weir crest meant that the weir was virtually impassable.
In the summer of 2012 the Tyne Rivers Trust undertook work to improve fish passage. At this site electro fishing had highlighted poor salmon numbers and lower species diversity upstream of the obstruction. Following public consultation and using funding from DEFRA, contractors set about installing a full width rock ramp fish pass. This involved retaining the existing weir crest, with the addition of a series of rock ramps. The result is a series of pools constructed with 180 tonnes of stone which reduce the single large leap into several small cascades which are much more easily negotiated by all types of fish. Around 18 miles of river above the weir have become more accessible thanks to the work. Broomhaugh and Riding Parish Council had spent more than £10,000 on repairing the weir in the last decade alone.
The River Restoration Centre would like to thank Paul Atkinson from the Tyne Rivers Trust for providing the information and photographs for this case study. +
G
The aim of the project in the long term is to ensure fish can pass Gottar Water Weir to access the habitats upstream. Potential options to achieve this may include, but are not exclusive to, installation of a fish pass, partial removal of the structure or full removal. The objectives of this specific contract are:
- to provide baseline information to a level suitable to inform options appraisal design of measures,
- to list and appraise measures for easing fish passage
- after discussion with the client, to produce a design for one selected measure suitable for a design and build contract. +
L
The aim of the project is to install a new cascade fish pass to improve fish passage through a reach of the Lodge Burn in Coleraine as part of a wider Flood Alleviation Scheme. A perched culvert with a concrete apron outfall located in the center of the town was causing disruption to fish passage and sediment transport.
The location of this structure meant that re-design of the reach had to work within a very confined space between two high flood walls, which encompassed installation of the cascade sequence and re-design of the culvert bed.
The works were carried out in four key stages;
1. Flow management; works to install the step pool sequence and improve the culvert bed had to be conducted in the dry. A fully isolated dry working area was achieved by sandbagging and over-pumping.
2. Modify culvert bed; it was necessary to ensure passability for fish through the culvert, therefore the new culvert bed was fixed 300mm below the previous bed
3. Install natural bed in culvert; from a mix of cobble and boulders
4. Remove concrete apron and install cascades
Spacing between cascades was 6m, therefore in total the pass extended for 36m downstream of the culvert.
It was envisaged that some maintenance of the pass would be needed, so a demountable barrier was included in the floodwall design to facilitate channel access if required.
The project is an excellent example of what can be achieved to improve fish passage in a confined space. Cascade strength was a major consideration as failure of the top cascade would have left a perched culvert once again, therefore it was deemed better to over-engineer the first two cascades to ensure their long term stability.
In terms of aesthetics the new pass has had a positive response, however flooding shortly after construction caused some damage to the face of the first cascade as well as gravel and cobble washout from culvert. This resulted in infilling of the pools, which was removed after flooding, and highlighted the importance of pool design incorporating sufficient self-maintaining processes i.e. sufficient flow through to maintain the pool depth. The remaining cobble within the culvert is now deemed to be stable.
Community Involvement - "Salmon in the classroom" scheme undertaken at a local primary school, fish release highlighted on BBC TV and local press.
W
The aim of the project is to prepare the revitalization plan of two small streams based on a geodesic survey. The steams were straightened and channelized, old natural steam beds became oxbows, and were filled up at several places. The objectives are to restore meanders, water depth variation, and to create new aquatic habitats and natural banks with native plant coverage. +
T
The aim of the project was to connecting agricultural polder Fortuna (2,115 ha) to the Danube regime. Restoration of hydrological regime and hydrological functions means for this area, restoring and establishing the following functions:
- habitat for plants and animals typical alluvial areas;
- habitat and breeding area for fish and aquatic birds;
- reservoir for biodiversity and providing genetic resources;
- biocoridor and genetic exchange;
- organic production;
- biogeochemical circuit elements;
- retention of sediments and pollutions;
- Black Sea biofilter +
V
The aim of the project was to obtain knowledge and experience on possibilities how to restore natural hydro-morphologic conditions and the connectivity between the river and floodplain zone. The main objective of the implementations was to provide a direct water flow connection between the Danube main stream and the side arm in order to restore the natural biodiversity and rheophilic communities typical for aquatic floodplain landscapes. The re-opening was accompanied by an extensive scientific research and monitoring program, which showed changes in riverbed morphology upstream and downstream of the rock dam. Restored high floods increased sediment transport, erosion and deposition. Suitable habitats for rheophilous invertebrate and fish species as well as species diversity and population numbers typical for dynamic water bodies increased. +
R
The aim of the project was to restore reaches of river within the SSSI. In particular to increase channel sinuosity, retain large woody material, carry out bank enhancement and raise bed levels. Carry out tree management where agreed in the Strategic Restoration Plan (Royal Hakoning, 2014).
The works consisted of constructing in channel and bank features to conserve, enhance, restore, and rehabilitate features along the river. A total of 30 features were installed to stimulate the level of natural processes to return the SSSI back to favourable condition in the medium to longer term.
• Bank re-profiling – 10 stretches of bank mainly the inside of meanders were re-profiled to vary the gradients, creating shallows and increase habitats.
• Channel narrowing – In 4 suitable location banks were pushed into the channel to create backwaters
• Brushwood mattresses – 9 BWM were installed to narrow over wide and straight sections of channel.
• Large Wood Material – Locally sourced timber was installed in 7 location to add flow variation to the channel.
• Gravel – Gravel was added to 3 locations to raise the bed level. It was introduced at 4 m intervals.
• Tree planting – The river has little riparian tree cover so 475 trees were planted in 6 blocks. +
I
The aim of this research project on the Pontbren catchment in north Wales (Photo 1 and Map 1) was to improve understanding of how changes in upland land management impact on flood risk at the catchment scale. Experimental plots were established to measure the effects of sheep grazing and tree planting on soil structure and the generation of flood run-off. The data from these plots were used to derive parameter values and uncertainty bounds for a multi-scale modelling methodology. The model was applied to the headwater catchment to predict the impact of alternative land use practices on flood flows. Results showed that land management can have a major effect on run-off processes, providing scope for targeted interventions to significantly reduce flood risk in low permeability, upland landscapes at local scales.
Soil infiltration rates were found to be 67 times higher within woodland plots and shelterbelts planted on improved grassland compared with grazed pasture; this reduced measured surface run-off volumes by an average of 78% compared with the control. These differences were quick to develop, becoming apparent within one year of sheep exclusion and tree planting. This was partly explained by the removal of the grazing pressure on the soil, which reduced run-off volumes by 48%, and partly by the action of tree rooting and growth, which was responsible for the remaining 30% decrease.
Modelling predicted that planting tree strips across 7% of the 12km2 headwater catchment could reduce a severe flood (return period of 180 years) by an average of 5%. The effect of complete afforestation was much greater, reducing the same flood peak by an average of 36%. +
Q
The aims of the project Quercus are common for every case. Vision of the project, was to reduce crime and fear of crime in order to increase use and enjoyment of the river and its surroundings. River Dee project contains several changes in riversides of the river in Chester. The main areas of the project are Flintshire Riverside Path Access Improvements, Roodee Access Improvements, Castle Drive Improvements, Grosvenor Park and Meadows Access Improvements. +
W
The aims of the project were:
•To draw attention to the brook and to highlight how local people could make a difference in maintaining it and improving it in the future, whilst also making some improvements to the brook.
•To open up the river by coppicing a short stretch which would be immediately noticeable to local residents and to provide views along the brook which were previously hidden. This would also allow extra light into the brook and along it’s bankside to promote plant growth and increase the productivity of the river.
•To construct in-stream woody structures along the newly cleared stretch to introduce some variability to the flow pattern of the brook within its natural banks. It was intended that these structures would also act as refuges and habitats for juvenile fish, including the small numbers of brown trout present in the area.
•To patch areas of bank erosion along the site using natural woody materials.
• To investigate other areas of the river for the future to offer ongoing solutions and opportunities for local people and the local authorities to continue improvement and maintenance of the town’s most valuable natural asset. +
H
The aims of the two-phase revitalization were to enhance the water supply of the river under Répcelak, to fit hydraulic structures into the landscape, to restore natural hydrologic conditions, to increase the area of fish habitats and spawning grounds, to establish continuous shading and to ensure the stability of the riverbed on a long term basis by planting of native tree species along the river bank and by strengthening the bank with natural materials. +
N
The area of intervention is indeed a strip of territory, which for historical reasons and geographical conditions, has been relatively little used and so it was particularly intact.
For these characteristics, in this particular area have been identified seven SIC showing the particular concentration of species and habitats priority.
Unfortunately, in recent years occurred excessive use of resources and environments and abandonment and neglect of large portions of land that have caused serious degradation phenomena (pollution of water, simplification of environments, surface soil erosion, spread of exotic species,… etc.).
Particularly in view of the situation described above, the project has provided actions:
- Preliminary analysis environment, fauna and flora;
- Training courses, meetings of public awareness, production of informative material and
construction of a dedicated Web site;
- Recovery territorial Interventions (removal of exotic species, forest management, rehabilitation
of degraded habitats);
- Monitoring the quality of natural environments and the impact of works.
The main results achieved were as follows:
1. Adherence to the system of certification of forest management recognized at the level of
European forests Regional Natural Reserve of the "Selva Lamone of" Action A6;
2. Safeguard measures in the woods, Action C1;
3. Construction of infrastructure read to prevent the passage on lawns (presence of rare species
and orchids), Action C2;
4. Restoration of riparian buffer strip of River Olpeta and Lake Mezzano, Action C3;
5. Implementation of operations of wetlands along the riparian zone at the River Olpeta and Lake
Mezzano, Action C4;
6. Periodic cutting grass in areas at risk of colonization by the invasive shrubs, Action D1;
7. Implementation of operations for forest management, Action D2;
8. Maintenance network paths of Regional Natural Reserve of the Selva Lamone and Lake
Mezzano, Action D3;
9. Maintenance of riparian buffer strip at the River Olpeta and Lake Mezzano, Action D4;
10. Distribution of leaflets to the public with the involvement of schools and universities, Action
E1;
11. Distribution of brochures to the public with the involvement of schools and universities,
Action E2;
12. Allocation of sixteen boards and information boards in the most important points of SCI and
Commons, Action E5;
13. Realization of press conferences, Action E6;
14. Accomplishing a public meeting with farmers' category, Action E9
I
The area of operation in the Terri River as it passes through the town of Porquera is degraded due to human activity, with modification of the banks and abundant invasive species such as Arundo donax, Populus deltoides, Robinia pseudoacacia and others.
The main objective is to reduce the risk of flooding in the industrial zone of the municipality and improve the section from the standpoint of environment and landscape, with performances by removing invasive species, removal of structures, etc.
The project has a total budget of 507.194,85 € and is financed by the ACA (Agencia Catalana del Agua), Municipality of Porqueres and Government of Gerona. +
W
The area of the London Borough Wandsworth on the west bank of the confluence of the River Wandle and the tidal River Thames was previously a 4 hectare Shell Oil terminal, and subsequently a brownfield industrial site. The area had been protected over time from tidal flooding through a combination of concrete quays and timber and metal tidal defences. The history of the site led to issues of contaminated land and a disconnection of the area from the rivers it borders.
The former industrial site was redeveloped through a number of phased developments, which together comprised a complex of residential and commercial properties on the Thames waterfront under the name '''Wandsworth Riverside Quarter'''.
The redevelopment was identified by the Environment Agency as having the potential to provide an improved riverside environment, and an opportunity to reconnect the rivers with the people now using the previouslyderelict site. The suggested solution was to replace the existing tidal defences with a series of tidal terraces, creating a new intertidal zone and facilitating a range of associated transitional habitats.
Formation works (January 2009)
• Preparation of site (coffer dams, excavation and
soil removal, bank re-profiling, and set up site
compound).
Hard landscape works (February 2009):
* Laying contamination textile to reduce risk of contaminated soils entering the Thames during the works.
* Constructing timber terraces.
* Placing backfill materials.
* Laying root barrier.
* Laying silt accretion geotextiles to encourage silt to accumulate between the terraces.
* Fixing coir rolls at channel margins.
* Installing dead wood habitat staked at the margins between the slope and the channel to encourage more diverse plant establishment and flow conditions.
Monitoring period (March-May 2009)
* After installation silt was allowed to naturally accrete in the lower terraces to allow for the growth of tidal flora. Silt accumulation was monitored during this period and a significant increase in sediment accretion between the terraces was
recorded.
Rock roll installation (May 2009)
* Rock rolls (wave energy reduction structures installed by long reach plant) installed along with coir matting to encourage plant growth. Planting (June 2009)
* Intertidal vegetation was planted and dead wood installed along the terraces.
'''techniques used'''
* Preserve and improve water’s edge and bank side habitats
* Retain and improve existing water’s edge and bankside habitats in modified watercourses
* Realign flood defences to increase coastal and intertidal habitat
* Restore aquatic habitats in modified watercourses
* Use green engineering techniques instead of hard bank protection
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https://www.therrc.co.uk/sites/default/files/projects/51_wandsworth.pdf
R
Restoration project of the degraded area of the Molí source environment and improvement of river areas and adjacent riparian formations +
The area to be restored has been divided into two sections. In the first, there is a medieval wall damaged by time and erosion visible on the slope that separates the river bed. In the second, we see the effects of erosion caused by a channel: nearly vertical slope with landslides in some areas.
The main actions in this project are: the use of new bioengineering elements in order to stabilize slope banks and to prevent erosion in town wall; replaced the hard defenses by bioengineering structures; facilitate natural regeneration of riparian vegetation.
The project has a total budget of 94.788,5 € and is financed by the Municipality of Besalú. +
The areas to be restored are the streams of Vallmanya and Reixac until their union and later mouth in the Tordera. Both streams are under strong human pressure but the more degraded is the Reixac, since the upper reaches of the stream of Vallmanya is in a good condition and reflects the potential of the area as a biological corridor.
The main objectives of the project are to promote the natural dynamics of the ecological improvement (removing non-native vegetation and enhance the richness, biodiversity and riparian degree of coverage area), improve the hydraulic conditions of the streams and increase the landscape value of the site.
The project has a total budget of 413.420,91 € and is financed by Inditex Group, S.L. +