Case study:Pymmes Park Wetlands

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Location: 51° 37' 5.38" N, 0° 4' 15.68" W
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Project overview

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Status Complete
Project web site
Themes Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Monitoring, Social benefits, Water quality, Urban
Country England
Main contact forename Ian
Main contact surname Russell
Main contact user ID
Contact organisation London Borough of Enfield
Contact organisation web site http://enfield.gov.uk/
Partner organisations London Borough of Enfield, Friends of Pymmes Park, Thames21
Parent multi-site project

Case_study:Rewilding Enfield's Urban Rivers

This is a parent project
encompassing the following
projects
No
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Project summary

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Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B)
Area category 10 - 100 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 2626 m <br />0.026 km <br />2,600 cm <br />
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Urban
Waterbody ID GB106038027910



Other case studies in this subcatchment: Firs Farm Wetlands


Site

Name Pymmes Park Wetlands
WFD water body codes UKGB106038027910
WFD (national) typology
WFD water body name Pymmes Brook (Salmons Brook to Lee, includes Part of Lee Navigation B)
Pre-project morphology Closed culvert
Reference morphology
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology Surface Water Runoff
Dominant substrate Clay, Gravel
River corridor land use Urban - Culverted, Parklands, Grassland
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Poor Water Quality of Lake
Hydromorphology Quantity & dynamics of flow
Biology
Physico-chemical Oxygen balance, Nutrient concentrations, PH, Biological Oxygen Demand, Total Suspended Solids, Heavy Metals, Hydrocarbons
Other reasons for the project Improving Health and Wellbeing of local park users


Measures

Structural measures
Bank/bed modifications Deculverting, wetland creation, ponds and pools inside the wetland, creation of a new floodplain parallel to the river
Floodplain / River corridor Creation of reedbed, Creation of wetland, Creation of wetlands, Deculverting, Extensive planting, Sustainable urban drainage ponds (SUDs)
Planform / Channel pattern
Other
Non-structural measures
Management interventions Reduced pollution
Social measures (incl. engagement) education; public amenity and perception, Community involvement
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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