Case study:Rehabilitation of the River Brett at Shelley, Suffolk

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Location: 52° 0' 26.25" N, 0° 57' 32.38" 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	Trevor
Main contact surname	Bond
Main contact user ID	User:Tbond
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Dedham Vale AONB, Suffolk Wildlife Trust
This is a parent project encompassing the following projects	River restoration on the River Brett at Shelley

A flow deflector installed on the River Brett upstream of Shelley Bridge

Project summary

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The habitat enhancement work at Shelley was implemented with a view to improving the ecology of the River Brett. The work, which incorporated a variety of techniques including flow deflector installation, berm creation, pool & riffle formation and river bank reprofliing, was part of a wider scheme of works undertaken on the River Stour and its tributaries in 2014.

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Image gallery

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Composite berm consisting of a downstream flow deflector back-filled with spoil material taken from the originally over-steep embankment. The wooden toe adds stability and protection to the feature.

A second composite berm. Vertical stakes, which hold the berm and wood in place, can be seen.

Some of the Environment Agency staff involved with the implementation of the scheme.

A berm made of soft bed material and reed vegetation. This feature has narrowed the active channel and increased flow velocity locally.

Flow deflector combined with pool excavation to increased habitat diversity. Willow spillings and branches have been included to provide shelter for juvenile fish and invertebrates.

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 Brett (Lower) Area category 100 - 1000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9292 m <br />0.092 km <br />9,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105036040930 Other case studies in this subcatchment: River restoration on the River Brett at Shelley Site Edit site Name River Brett at Shelley WFD water body codes GB105036040930 WFD (national) typology Low, Medium, Calcareous WFD water body name River Brett Pre-project morphology Straightened Reference morphology Straightened Desired post project morphology Sinuous Heavily modified water body Yes National/international site designation Local/regional site designations None Protected species present Yes Invasive species present Yes Species of interest Water Vole, Giant Hogweed Dominant hydrology Groundwater Dominant substrate Gravel River corridor land use Intensive agriculture (arable), Improved/semi-improved grassland/pasture Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 0.1 - 1.0 m³/s Mean annual discharge (m3/s) Average channel gradient category Less than 0.001 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 800800 m <br />0.8 km <br />80,000 cm <br /> Project started 2014/06/01 Works started 2014/09/29 Works completed 2014/10/03 Project completed 2014/11/21 Total cost category 10 - 50 k€ Total cost (k€) Benefit to cost ratio Funding sources Environment Agency Grant in Aid Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Less than 1 k€ Environment Agency Trevor Bond Stakeholder engagement and communication Less than 1 k€ Dedham Vale AONB Matt Holden Works and works supervision 1 - 10 k€ Environment Agency Adrian Pearl 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