Case study:River Can Backwater Restoration

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Location: 51° 44' 15.61" N, 0° 26' 46.23" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Water quality
Country	England
Main contact forename	Matt
Main contact surname	Butcher
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	local authority
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Restoration of a former mill channel to improve backwater habitat for fish, plants and invertebrates. Restored mill channel will also act to improve the quality of surface water run-off from adjacent urban area.

The River Can is at a Poor Ecological Status and is not meeting WFD objectives for Fish, invertebrates and Macrophytes. Restoring and reconnecting the historic mill channel into the river will create addition habitat. Surface water from the adjacent urban area also discharges into the mill channel. Leaky dams installed in the mill channel will slow the surface water down, allowing any sediment to settle out and filtering any pollution, thus improving water quality. The mouth of the channel has been widened and de-silted. Better connecting the back channel habitat and refuge from both high flows and predators for fish. Warm shallow areas have also been created. which are ideal habitat for fish fry.

Monitoring surveys and results

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By Intercepting run-off and trapping sediment, this scheme will help achieve better water quality preventing the loss of soil, chemicals, nutrients, and faecal organisms. A further benefit is their ability to temporarily capture water and slow down flow. his can reduce localised flooding. Improved back channel habitat that is better connected to the main river will benefit fish invertebrates and plants both in the riparian zone and amin river.

Lessons learnt

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Local authorities own significant amounts of land along all of our main rivers. Working in partnership with them can improve their parkland and nature reserves for amenity, recreation and conservation, benefiting local communities wildlife and reducing flood risk.

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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 Anglian River basin Combined Essex Subcatchment River name Can Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9090 m <br />0.09 km <br />9,000 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105037033840 Site Edit site Name WFD water body codes GB105037033840 WFD (national) typology WFD water body name 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) Project started Works started Works completed Project completed Total cost category 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 more than 10000 k€ 1000010,000 k€ <br />10,000,000 € <br /> 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications 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 Supplementary Information Edit Supplementary Information