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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(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

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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

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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

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Mitigation of a pressure	Diffusse pollution
Hydromorphology
Biology	Fish, Invertebrates
Physico-chemical
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Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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quality elements

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

Biological quality elements

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quality elements

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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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Project Area

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Additional links and references

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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

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