Case study:Salmons Brook Urban Diffuse Pollution Project

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Location: 51° 40' 5.87" N, 0° 0' 49.44" W

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Project overview

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Status	In progress
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Social benefits, Water quality
Country	England
Main contact forename	Aimee
Main contact surname	Felus
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations	Environment Agency, LB Enfield, University College London, Friends of groups, Thames Water
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Lower Lee Valley waterways are profoundly polluted. The problem of urban diffuse pollution is chronic and highly visible. It blights the potential of East London’s rivers, reducing them as an amenity for people, damaging them for wildlife and turning them into open sewers. These problems have existed for many years now, but increasing population density and climate change are seeing them intensify. What has been missing from efforts to tackle the problems is properly involving people. Awareness of the pollution is very low, evidenced by the proportionately small number of calls to the Environment Agency’s Pollution Hotline. East London’s communities are fundamental to any long lasting improvement in the Lower Lee Valley’s water quality. While strategic efforts will aim to address the problems truly sustainable solutions have to happen at the household and street level too. The issue of diffuse pollution must be addressed as a priority in improvement works to rivers, oth-erwise rivers in East London will still run with wastewater and road run-off.

Thames21 has secured funding from DEFRA for the Salmon’s Brook Healthy River Challenge – a project to reduce diffuse urban pollution in the Salmon’s Brook, a main tributary of the River Lea in Enfield. The project will see the creation of six community centred bio-retention and sustainable urban drainage systems (SuDS) along the Salmons Brook. These SuDS will intercept diffuse urban pollution, provide attenuation for flooding, and create new areas of biodiverse habitat and new amenities for local people.

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Project Area

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 Lower Lee WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No 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 Works started Works completed Project completed Total cost category 500 - 1000 k€ Total cost (k€) 526526 k€ <br />526,000 € <br /> Benefit to cost ratio Funding sources Catchment Restoration Funds 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 Diffusse pollution Hydromorphology Biology Fish, Invertebrates Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) 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 http://www.environment-agency.gov.uk/ Executive Non-departmental Public Body responsible to the Secretary of State for Environment, Food and Rural Affairs. The principal aims are to protect and improve the environment, and to promote sustainable development. We play a central role in delivering the environmental priorities of central government through our functions and roles. Supplementary Information Edit Supplementary Information