Case study:Salmons Brook Flood Alleviation Scheme, Montagu Recreation Ground site

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Location: 51° 37' 17", -0° 2' 40"
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Project overview

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Status In progress
Project web site http://www.gov.uk/environment-agency/salmons
Themes Flood risk management, Habitat and biodiversity, Social benefits
Country England
Main contact forename Steven
Main contact surname Whipp
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
A redundant gauging station before works started

Project summary

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Re-grading banks, creation of wetland berms and ephemeral wetlands, remove redundant gauging weir and invasive species Mitigation for impacts for impacts of Salmons Brook Flood Alleviation Scheme. Currently an extremely poor quality park, with little value - brook is deep set, has many invasive species from working areas and significant gradient issue (low gradient). Adding value to the reinstatement of the public park following construction works and ensuring that overall the Salmons Brook Flood Alleviation Scheme has a positive environmental impact. Planned, Designed and in Construction.

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Lessons learnt

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Image gallery


Scheme plan
During construction
Area besides Zambezie Drive prior to construction
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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 River Restoration at Laymer Road, Salmons Brook at Grange Park


Site

Name
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 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

Reach length directly affected (m) 200 m
0.2 km
20,000 cm
Project started 2013/05/01
Works started
Works completed
Project completed 2015/06/01
Total cost category 100 - 500 k€
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 Flood risk management, Invasive species
Hydromorphology
Biology
Physico-chemical
Other reasons for the project Landscape enhancement


Measures

Structural measures
Bank/bed modifications Bank reprofiling, Weir removal
Floodplain / River corridor Creation of wetland
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Aesthetics
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



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Additional links and references

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Supplementary Information

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