Case study:Rewilding Enfield's Urban Rivers

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Location: 51° 39' 8.28" N, 0° 4' 50.56" W

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Project overview

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Status	In progress
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Water quality, Urban
Country	England
Main contact forename	Aimee
Main contact surname	Felus
Main contact user ID	User:AimeeThames21
Contact organisation	Thames 21
Contact organisation web site	http://www.thames21.org.uk
Partner organisations	London Borough of Enfield, Environment Agency (in an advisory role), Thames Water, Friends of: Boxers Lake, Town Par, Firs Farm, Pymmes Park, Grovelands Park
This is a parent project encompassing the following projects	Alma Road Rain Gardens, Bury Lodge Wetlands, Enfield Town Park Wetlands, Firs Farm Wetlands, Glenbrook Wetlands, Grovelands Park Wetlands, Houndsden Road Rain Gardens, Pymmes Park Wetlands

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Project summary

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An innovative partnership project to 'rewild' Enfield's urban rivers and renaturalise the water system. The project encompasses 8 sites across the Salmons Brook and Pymmes Brook catchments, themselves part of the Lea catchment. Rivers here suffered from urban pollution, typically from road run off and misconnections. they are often heavily modified or culverted. The project aims to improve water quality, provide flood risk management, improve public spaces, increase good quality habitat and therefore promote biodiversity. Furthermore we aim to increase knowledge of the urban water cycle and how we influence it, and how we can protect our rivers.

The project is led by the London Borough of Enfield and Thames21, with assistance from Thames Water and advisory input from the Environment Agency. Funders include Defra, Thames Water, the Environment Agency and Greater London Authority.

Works to the watercourses and their catchments include the creation of wetlands, reedbeds, rain gardens and rain planters, as well as deculverting a stream through a popular park. In addition public engagement and education is key, and interpretation and access enhancements are being carried out on each site. Consulation was carried out before works, and additional project partners include many volunteers and advocates from the local community, as well as Friends groups in parks.

Monitoring surveys and results

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Monitoring has included water quality testing, macroinvertebrate sampling, fixed point photography, questionnaires and ecological surveys. See individual entries for more details.

Lessons learnt

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See individual project entries.

Image gallery

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Wetlands, rain gardens, rain planters in Enfield

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Thames River basin London Subcatchment River name Salmons Brook Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 136136 m <br />0.136 km <br />13,600 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106038027960 Other case studies in this subcatchment: Alma Road Rain Gardens, Bury Lodge Wetlands, Enfield Town Park Wetlands, Glenbrook Wetlands, Grovelands Park Wetlands, Houndsden Road Rain Gardens, Laymer Road Silt Trap and Recreational Ground, Rewilding Enfield's Urban Rivers, Salmons Brook Flood Alleviation Scheme, Montagu Recreation Ground site, Salmons Brook River Restoration at Laymer Road... further results Site Edit site Name Numerous WFD water body codes GB106038027960 WFD (national) typology WFD water body name Salmons Brook Pre-project morphology 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 Dominant substrate River corridor land use 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 Edit project background Reach length directly affected (m) Project started 2012/08/06 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Defra, Thames Water, Environment Agency, GLA 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 Edit reasons for restoration Mitigation of a pressure Poor water quality, Flood risk management Hydromorphology Heavily modified waterbodies Biology Poor ecology due to above and pollution issues Physico-chemical Urban diffuse and point source pollution from misconnections and road run off Other reasons for the project Improvement to public space and biodiversity Measures Edit Measures Structural measures Bank/bed modifications Daylighting 1.15km of streams Floodplain / River corridor Creation of wetland, Reedbed creation Planform / Channel pattern Channel naturalisation Other Rain gardens Non-structural measures Management interventions Associated terrestrial habitat improvements, water quality testing and misconnection surveys Social measures (incl. engagement) Community involvement, Community Education Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information