Case study:River restoration on the River Brett at Shelley

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Location: 52° 2' 4.85" N, 0° 57' 32.71" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, 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
Parent multi-site project	Case_study:Rehabilitation of the River Brett at Shelley, Suffolk
This is a parent project encompassing the following projects	No

Gravel shoulders created using material excavated from a newly created pool. Note how the flow is visibly quicker where the channel is constricted by the gravel features.

Project summary

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A river restoration project driven by a lack of morphological diversity on the River Brett between Layham and Hadleigh. The project involved the transformation of a straight, uniform, steeply embanked, trapezoidal river channel into a morphologically diverse, oxygenated and habitat-rich river channel. Key improvements made to the river here include increased floodplain connectivity, greater variety in channel depth and width and enhanced flow velocities (to accelerate geomorphic change).

Monitoring surveys and results

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Lessons learnt

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Image gallery

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An elongated berm feature on the River Brett near Layham

Berm feature incorporating a 'scrape' feature

A berm feature immediately after construction. This photograph is looking upstream from the true right-hand bank on the River Brett

Matt Holden from the Dedham Vale AONB overseeing the creation of one of our berms

Mitigation work prior to the start of the project included searching for evidence of water vole burrows

This great green bush cricket was found on-site

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name The River Brett at Layham 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 No National/international site designation Local/regional site designations None Protected species present Yes Invasive species present No Species of interest Water Vole Dominant hydrology Groundwater Dominant substrate Silt, Sand, Clay 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 1 - 10 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) 250250 m <br />0.25 km <br />25,000 cm <br /> Project started 2014/06/01 Works started 2014/10/06 Works completed 2014/10/10 Project completed 2014/11/14 Total cost category 1 - 10 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 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