Case study:Rewilding Enfield's Urban Rivers

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Location: 51° 39' 8", -0° 4' 51"
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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


Wetlands, rain gardens, rain planters in Enfield
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Catchment and 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) 136
136 m
0.136 km
13,600 cm
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

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

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

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

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

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

Link Description

Supplementary Information

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