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

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Location: 51° 37' 17.14" N, 0° 2' 40.23" W

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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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Scheme plan

During construction

Area besides Zambezie Drive prior to construction

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 River Restoration at Laymer Road, Salmons Brook at Grange Park Site Edit 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 Edit project background Reach length directly affected (m) 200 m0.2 km <br />20,000 cm <br /> 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 Edit reasons for restoration Mitigation of a pressure Flood risk management, Invasive species Hydromorphology Biology Physico-chemical Other reasons for the project Landscape enhancement Measures Edit 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 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