Case study:Dagenham Brook de-silting

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Location: 51° 34' 36.36" N, 0° 2' 25.84" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Colin
Main contact surname	Street
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

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Project summary

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Reduce flood risk improve channel conveyancing, improve health and safety for light water course maintenance. Reduce flood risk and channel capacity, remove dangerous deep pockets of heavily contaminated silts. WFD driven.

A 1.5km long ditch, which historically had been over dredged and subsequently not been maintained for years due to difficult access and inconsistent deep silt, required an over haul.

It was anticipated that there was 4,400t of silt to be removed, half of which was expected to be hazardous Land and Water Services could see flaws in the historic silt test results and therefore undertook additional sampling and detailed testing which enabled the silt to be reclassified as 100% non-hazardous. Furthermore rather than dredging down to the previously over dredged hard bed level, Land & Water designed a solution which reduced the volume of silt to be removed, and therefore the cost of the works, but provided the Environment Agency with a firm and level bed for future access and maintenance (*1)

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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 Lee (from Tottenham Locks to the Tideway) Area category 1000 - 10000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 141141 m <br />0.141 km <br />14,100 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Urban Waterbody ID GB106038077852 Other case studies in this subcatchment: Blackhorse Lane Waterfront Park, Essex Wharf, Hackney Marsh recreation grounds, Hackney Marshes - Wick Field recreation ground, Lea Bridge Waterway Wall Improvements, Lee Navigation by Walthamstow Marshes, Springfield Marina, Tottenham Lock Floating Ecosystem Site Edit site Name WFD water body codes GB106038077852 WFD (national) typology WFD water body name Lee (from Tottenham Locks to the Tideway) 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) 2000 m2 km <br />200,000 cm <br /> Project started 2009/01/01 Works started Works completed 2009/01/01 Project completed Total cost category 100 - 500 k€ Total cost (k€) Benefit to cost ratio Funding sources Environment Agency Flood and Coastal Risk Management 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 Hydromorphology Biology Physico-chemical Specific non-synthetic pollutants, Specific synthetic pollutants Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Removal of sediment 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://http://www.land-water.co.uk/dredging-dagenham-brook 1 Supplementary Information Edit Supplementary Information