Case study:Chinbrook Meadows Wetlands - Revision history

Ascarr at 10:30, 27 August 2024

2024-08-27T10:30:10Z

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	{{Project overview		{{Project overview
	\|Status=Complete		\|Status=Complete
	\|Project web site url=~~https://~~www.thames21.org.uk/improving-rivers/chinbrook-community-suds-healthy-wetlands-challenge/		\|Project web site url=www.thames21.org.uk/improving-rivers/chinbrook-community-suds-healthy-wetlands-challenge/
	\|Themes=Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Monitoring, Social benefits, Water quality, Urban		\|Themes=Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Monitoring, Social benefits, Water quality, Urban
	\|Country=England		\|Country=England

Ascarr at 10:28, 27 August 2024

2024-08-27T10:28:13Z

← Older revision		Revision as of 10:28, 27 August 2024
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	1. Improve water quality of the River Quaggy and reduce foul smells on site		1. Improve water quality of the River Quaggy and reduce foul smells on site

	• The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.		* The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.

	2. Improve biodiversity and amenity value of the land		2. Improve biodiversity and amenity value of the land

	• The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.		* The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.

	• Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.		* Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.

	3. Natural flood management		3. Natural flood management

	• The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.		* The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.

	4. Community Engagement		4. Community Engagement

	• Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.		* Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.

	In the autumn 0f 2023, the wetlands were excavated. During the winter and spring of 23/24, a series of well-attended volunteering events were run to get the wetlands ready to be re-opened. The site was litter picked, hedgerows and dead hedges were installed and over 2,600 plug plants were planted in and around the ponds. In addition, a footpath and turf was laid to improve accessibility and a wildflower meadow was established on the earth mound. The park was re-opened to the public in the summer of 2024 with an ongoing maintenance and monitoring plan agreed with the landowners and managers in place for 2025 onwards.		In the autumn 0f 2023, the wetlands were excavated. During the winter and spring of 23/24, a series of well-attended volunteering events were run to get the wetlands ready to be re-opened. The site was litter picked, hedgerows and dead hedges were installed and over 2,600 plug plants were planted in and around the ponds. In addition, a footpath and turf was laid to improve accessibility and a wildflower meadow was established on the earth mound. The park was re-opened to the public in the summer of 2024 with an ongoing maintenance and monitoring plan agreed with the landowners and managers in place for 2025 onwards.

Ascarr at 10:21, 27 August 2024

2024-08-27T10:21:52Z

← Older revision		Revision as of 10:21, 27 August 2024
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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

Jogoad at 11:07, 19 July 2024

2024-07-19T11:07:25Z

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Jogoad at 11:04, 19 July 2024

2024-07-19T11:04:08Z

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	\|Other motivation=Local amenity and community education		\|Other motivation=Local amenity and community education
	}}		}}
	{{Measures}}		{{Measures
			\|Bank and bed modifications measure=Partial diversion of river
			\|Floodplain / River corridor=Wetland habitat,
			\|Management interventions=Planting wildflower mixes, Riparian tree planting, plug planting
			\|Social measures=Community Events, Community consultation, Community Events, Community Litter-picking work, Volunteer work parties using the local community.,
			}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
	{{End table}}		{{End table}}

Jogoad at 11:01, 19 July 2024

2024-07-19T11:01:23Z

← Older revision		Revision as of 11:01, 19 July 2024
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	\|Monitoring Lead organisation=Ravensbourne Catchment Partnership		\|Monitoring Lead organisation=Ravensbourne Catchment Partnership
	}}		}}
	{{Motivations}}		{{Motivations
			\|Specific mitigation=Natural Flood Management
			\|Hydromorphological quality elements=Wetland creation
			\|Biological quality elements=Improving biodiversity
			\|Physico-chemical quality elements=Poor water quality
			\|Other motivation=Local amenity and community education
			}}
	{{Measures}}		{{Measures}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Jogoad at 10:59, 19 July 2024

2024-07-19T10:59:30Z

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	\|River corridor land use=Urban,		\|River corridor land use=Urban,
	}}		}}
	{{Project background}}		{{Project background
			\|Reach length directly affected=185
			\|Project started=2016
			\|Total cost category=100 - 500 k€
			\|Funding sources=Environment Agency, Greater London Authority, Bonneville Environmental Foundation
			\|Investigation and design Lead organisation=London Borough of Lewisham
			\|Stakeholder engagement Lead organisation=Thames21
			\|Works and supervision Lead organisation=Thames21
			\|Post-project management and maintenance Lead organisation=Glendale
			\|Monitoring Lead organisation=Ravensbourne Catchment Partnership
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Jogoad at 10:53, 19 July 2024

2024-07-19T10:53:04Z

← Older revision		Revision as of 10:53, 19 July 2024
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	1. Manhole at the top of Grove Park ditch		1. Manhole at the top of Grove Park ditch

	2. Inflow to Grove Park ditch proper		2. Inflow to Grove Park ditch proper

	3. Outflow from Grove Park ditch into the Quaggy River		3. Outflow from Grove Park ditch into the Quaggy River

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	Nutrients:		Nutrients:

	1. Nitrate-nitrogen (NO3-N):		1. Nitrate-nitrogen (NO3-N):

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	2. Ammoniacal-nitrogen (NH3-N):		2. Ammoniacal-nitrogen (NH3-N):

	- Rated good at the manhole and ditch inflow, very good at the ditch outflow.		- Rated good at the manhole and ditch inflow, very good at the ditch outflow.

	- Highest concentration after a long dry spell.		- Highest concentration after a long dry spell.

	- Decreases from manhole to outflow due to nitrification cycle.		- Decreases from manhole to outflow due to nitrification cycle.

	3. Total Nitrogen:		3. Total Nitrogen:

	- Not monitored by WFD but poor according to European Nitrogen Assessment (ENA).		- Not monitored by WFD but poor according to European Nitrogen Assessment (ENA).

	- Highest at the manhole (max: 14.2 mg/L, avg: 9.0 mg/L).		- Highest at the manhole (max: 14.2 mg/L, avg: 9.0 mg/L).

	4. Phosphate (orthophosphate):		4. Phosphate (orthophosphate):

	- Rated poor at the manhole, moderate in ditch locations.		- Rated poor at the manhole, moderate in ditch locations.

	- High variability in the manhole.		- High variability in the manhole.

	Heavy Metals:		Heavy Metals:

	1. Lead:		1. Lead:

	- Present in all samples, highest in the manhole (max: 0.4 mg/L).		- Present in all samples, highest in the manhole (max: 0.4 mg/L).

	2.Zinc:		2. Zinc:

	- Below detection limits in ditch samples, present in manhole samples (avg: 0.3 mg/L).		- Below detection limits in ditch samples, present in manhole samples (avg: 0.3 mg/L).

	3. Cadmium:		3. Cadmium:

	- Below detection limits in 50% of manhole samples, present at avg: 0.04 mg/L when detected.		- Below detection limits in 50% of manhole samples, present at avg: 0.04 mg/L when detected.

	4. Copper:		4. Copper:

	- Present in manhole samples, some ditch inflow, minimal ditch outflow. Max: 0.6 mg/L (manhole).		- Present in manhole samples, some ditch inflow, minimal ditch outflow. Max: 0.6 mg/L (manhole).

	Other Parameters:		Other Parameters:

	1. pH: Good in all sites.		1. pH: Good in all sites.

	2. Conductivity: No significant change between sites.		2. Conductivity: No significant change between sites.

	3. Coliform Bacteria: Improved from poor (manhole) to good (outflow).		3. Coliform Bacteria: Improved from poor (manhole) to good (outflow).

	4. BOD5 (Biochemical Oxygen Demand): Rated poor at all sites, slight improvement from manhole to outflow.		4. BOD5 (Biochemical Oxygen Demand): Rated poor at all sites, slight improvement from manhole to outflow.

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	ZSL Urban Wetland Monitoring Initiative		ZSL Urban Wetland Monitoring Initiative

	Chinbrook Meadows wetlands will host a trial citizen science project to monitor the health of the ponds. Developed by ZSL, the monitoring initiative will began in August 2024.		Chinbrook Meadows wetlands will host a trial citizen science project to monitor the health of the ponds. Developed by ZSL, the monitoring initiative will began in August 2024.
	\|Lessons learn=Community engagement		\|Lessons learn=Community engagement

Jogoad at 10:51, 19 July 2024

2024-07-19T10:51:46Z

Jogoad at 10:50, 19 July 2024

2024-07-19T10:50:41Z

← Older revision		Revision as of 10:51, 19 July 2024
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	\|Picture description=A picture taken in May 2024 of two of the four wetland cells		\|Picture description=A picture taken in May 2024 of two of the four wetland cells
	\|Project summary=The River Ravensbourne is a tributary of the River Thames, flowing for 17km from its spring in Keston, London Borough of Bromley, to its confluence with the Thames at Deptford. The area around the Ravensbourne is mainly urban and residential. However, it does flow through some greenspaces, including Chinbrook Meadows on the Bromley/ Lewisham boarder where the wetland is located.		\|Project summary=The River Ravensbourne is a tributary of the River Thames, flowing for 17km from its spring in Keston, London Borough of Bromley, to its confluence with the Thames at Deptford. The area around the Ravensbourne is mainly urban and residential. However, it does flow through some greenspaces, including Chinbrook Meadows on the Bromley/ Lewisham boarder where the wetland is located.

	The site was previously a lightly used recreational field on the edge of a series of fields that make up Chinbrook Meadows. Anecdotally, the field was mainly used by dog walkers but was not as well used as other sections of the wider park. Grove Park Ditch runs from the northwest to the southeast, parallel to the south east railway line, where it joins the River Quaggy, a tributary of the River Ravensbourne. The ditch had become blocked and foul smelling, so the Friends of Chinbrook Meadows reported the problem to the London Borough of Lewisham, who manage the site. Alongside Thames21 a plan for a series of wetland scrapes was developed to treat the water from the ditch before it enters the River Quaggy.		The site was previously a lightly used recreational field on the edge of a series of fields that make up Chinbrook Meadows. Anecdotally, the field was mainly used by dog walkers but was not as well used as other sections of the wider park. Grove Park Ditch runs from the northwest to the southeast, parallel to the south east railway line, where it joins the River Quaggy, a tributary of the River Ravensbourne. The ditch had become blocked and foul smelling, so the Friends of Chinbrook Meadows reported the problem to the London Borough of Lewisham, who manage the site. Alongside Thames21 a plan for a series of wetland scrapes was developed to treat the water from the ditch before it enters the River Quaggy.

	The main outcome of the project is to improve water quality of the River Quaggy through increased removal of pollutants from surface water through the processes that will occur within the constructed wetland (sediment trapping, nutrient removal and chemical detoxification). Additionally, this project will involve the local community and learnings from this wetland project can be shared across the Ravensbourne Catchment Partnership. This will boost awareness of challenges to rivers and how nature-based solutions can tackle these.		The main outcome of the project is to improve water quality of the River Quaggy through increased removal of pollutants from surface water through the processes that will occur within the constructed wetland (sediment trapping, nutrient removal and chemical detoxification). Additionally, this project will involve the local community and learnings from this wetland project can be shared across the Ravensbourne Catchment Partnership. This will boost awareness of challenges to rivers and how nature-based solutions can tackle these.
	The aims of the project are fourfold:		The aims of the project are fourfold:

	1. Improve water quality of the River Quaggy and reduce foul smells on site		1. Improve water quality of the River Quaggy and reduce foul smells on site

	• The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.		• The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.

	2. Improve biodiversity and amenity value of the land		2. Improve biodiversity and amenity value of the land

	• The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.		• The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.

	• Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.		• Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.

	3. Natural flood management		3. Natural flood management

	• The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.		• The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.

	4. Community Engagement		4. Community Engagement

	• Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.		• Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.

	In the autumn 0f 2023, the wetlands were excavated. During the winter and spring of 23/24, a series of well-attended volunteering events were run to get the wetlands ready to be re-opened. The site was litter picked, hedgerows and dead hedges were installed and over 2,600 plug plants were planted in and around the ponds. In addition, a footpath and turf was laid to improve accessibility and a wildflower meadow was established on the earth mound. The park was re-opened to the public in the summer of 2024 with an ongoing maintenance and monitoring plan agreed with the landowners and managers in place for 2025 onwards.		In the autumn 0f 2023, the wetlands were excavated. During the winter and spring of 23/24, a series of well-attended volunteering events were run to get the wetlands ready to be re-opened. The site was litter picked, hedgerows and dead hedges were installed and over 2,600 plug plants were planted in and around the ponds. In addition, a footpath and turf was laid to improve accessibility and a wildflower meadow was established on the earth mound. The park was re-opened to the public in the summer of 2024 with an ongoing maintenance and monitoring plan agreed with the landowners and managers in place for 2025 onwards.
	\|Monitoring surveys and results=2016 Pre-intervention data:		\|Monitoring surveys and results=2016 Pre-intervention data:

	Water Quality Sampling Summary (January - May 2016)		Water Quality Sampling Summary (January - May 2016)

	Sampling Locations:		Sampling Locations:

	1. Manhole at the top of Grove Park ditch		1. Manhole at the top of Grove Park ditch
	2. Inflow to Grove Park ditch proper		2. Inflow to Grove Park ditch proper
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	Nutrients:		Nutrients:
	1. Nitrate-nitrogen (NO3-N):		1. Nitrate-nitrogen (NO3-N):

	- Classified as good in all locations.		- Classified as good in all locations.

	- Highest concentration: 5.25 mg/L (manhole).		- Highest concentration: 5.25 mg/L (manhole).

← Older revision		Revision as of 10:50, 19 July 2024
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	The main outcome of the project is to improve water quality of the River Quaggy through increased removal of pollutants from surface water through the processes that will occur within the constructed wetland (sediment trapping, nutrient removal and chemical detoxification). Additionally, this project will involve the local community and learnings from this wetland project can be shared across the Ravensbourne Catchment Partnership. This will boost awareness of challenges to rivers and how nature-based solutions can tackle these.		The main outcome of the project is to improve water quality of the River Quaggy through increased removal of pollutants from surface water through the processes that will occur within the constructed wetland (sediment trapping, nutrient removal and chemical detoxification). Additionally, this project will involve the local community and learnings from this wetland project can be shared across the Ravensbourne Catchment Partnership. This will boost awareness of challenges to rivers and how nature-based solutions can tackle these.
	The aims of the project are fourfold:		The aims of the project are fourfold:

	1. Improve water quality of the River Quaggy and reduce foul smells on site		1. Improve water quality of the River Quaggy and reduce foul smells on site
	• The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.		• The wetland uses wetland flora to naturally clean diverted water from the ditch before it enters the River Quaggy.

	2. Improve biodiversity and amenity value of the land		2. Improve biodiversity and amenity value of the land
	• The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.		• The wetland has replaced an area of grassland which had relatively low ecological value. Wetlands are well established self-sustaining ecosystems with high value flora and fauna.
	• Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.		• Additionally, footpaths, wildflower meadows and interpretation boards will increase public access to the site and provide an opportunity to learn about aquatic habitats.

	3. Natural flood management		3. Natural flood management
	• The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.		• The wetland will provide additional storage of rainfall during high rainfall events and slow the flows of the River Quaggy.

	4. Community Engagement		4. Community Engagement
	• Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.		• Provide volunteering opportunities through activities such as water quality monitoring pre- and post-wetland creation, planting and vegetation management to engage the wider community in the long-term.
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	Chinbrook Meadows wetlands will host a trial citizen science project to monitor the health of the ponds. Developed by ZSL, the monitoring initiative will began in August 2024.		Chinbrook Meadows wetlands will host a trial citizen science project to monitor the health of the ponds. Developed by ZSL, the monitoring initiative will began in August 2024.
	\|Lessons learn=Community engagement		\|Lessons learn=Community engagement

	- Early and consistent community engagement is key		- Early and consistent community engagement is key

	- Posters aren’t enough. Leaflets, presence at community events, word of mouth and meeting with councillors are all useful engagement techniques.		- Posters aren’t enough. Leaflets, presence at community events, word of mouth and meeting with councillors are all useful engagement techniques.

	- Communicating nuance is difficult. Conversations around flood risk, biodiversity and water quality require care and patience. The importance of using language that is easily understood cannot be understated.		- Communicating nuance is difficult. Conversations around flood risk, biodiversity and water quality require care and patience. The importance of using language that is easily understood cannot be understated.

	Logistics		Logistics

	- Construction site difficulties/ break ins. Securing the site was difficult with frequent break ins and vandalism.		- Construction site difficulties/ break ins. Securing the site was difficult with frequent break ins and vandalism.

	- Deliveries to parks are difficult, especially here as a tunnel under the railway track restricts the vehicle size.		- Deliveries to parks are difficult, especially here as a tunnel under the railway track restricts the vehicle size.

	- Close relations with the council and contractors is key for support.		- Close relations with the council and contractors is key for support.
	\|Project title=Chinbrook Meadows Wetlands		\|Project title=Chinbrook Meadows Wetlands