Case study:River Wandle: Silt & SuDs

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Location: 51° 22' 14.47" N, 0° 9' 34.59" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Hydromorphology, Social benefits, Water quality, Urban
Country	England
Main contact forename	Bella
Main contact surname	Davies
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

An example of one of the man made structures

Project summary

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The overall aim of the project is to improve the ecological potential of the Wandle water bodies by reducing the impact of man-made structures on the river’s ecology, restoring natural features and processes and reducing the impact of urban diffuse pollution. To reduce urban diffuse pollution, five innovative measures were installed and trialled to determine their effectiveness for mitigation of urban diffuse pollution, particularly road runoff:

Rain Gardens installed to intercept surface water and aesthetically enhance an area in Hackbridge. Downstream Defenders (DD) intercept surface water drains and remove sediment by centrifugal forces. Mycofiletrs are bags full of a substrate as a feedstock for the native oyster mushroom which accumulate toxins such as heavy metals from the passing water. Siltex is a natural chalk like substance which helps to increase the speed of silt breakdown by stimulating natural processes. Smart Sponges are a commercial product specially designed to absorb oils mixed in the water. When placed in gully pots, Smart Sponges can permanently remove oils from the drainage system before they enter the rivers.

Monitoring surveys and results

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Lessons learnt

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Challenges:

- Identify spaces for DDs underground amongst utilities.

- Each defender had to be custom made to match the angle of the various outfall pipes allowing them to integrate with the established system.

- Getting commitment from parties to empty the DDs.

Image gallery

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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 Wandle (Carshalton Branch at Carshalton) Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 160160 m <br />0.16 km <br />16,000 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039017640 Other case studies in this subcatchment: Butter Hill Phase 2, River Wandle Restoration Project, River Wandle: Butter Hill Phase 1, River Wandle: Silt & SuDs, Wandle River Restoration Project: Hackbridge Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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) Project started 2012/07/01 Works started Works completed Project completed 2015/03/31 Total cost category Total cost (k€) Benefit to cost ratio Funding sources Defra Catchment Restoration Fund 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 Pollution incident, Flood risk management, Urbanisation Hydromorphology Substrate conditions Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Reduce diffuse pollution Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Community involvement 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 RRC Monitoring table - Wandle Additional documents and videos Upload additional documents CRF Project briefing note - Wandle Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information