Case study:River Stour habitat enhancements at Great Bradley and Little Bradley

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Location: 52° 9' 1.25" N, 0° 26' 25.30" E

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Project overview

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Status	In progress
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Will
Main contact surname	Akast
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk
Partner organisations	Dedham Vale AONB and Stour Valley Project
Parent multi-site project
This is a parent project encompassing the following projects	No

Woody Debris Flow Deflectors in River Stour near Great Bradley

Project summary

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The ecological value of the River Stour between Great Bradley and Little Bradley is limited by three key factors: poor water quality, control structures and the periodic flushing of large volumes of water through the reach for the Ely-Ouse transfer scheme. Working in partnership with landowners, the Dedham Vale AONB and the Stour Valley Trust this project focused on creating those habitats that are currently lacking. Two kilometres of river habitat was enhanced with fifty woody debris structures installed to create flow diversity and habitat for fish. Large woody material (provided by landowners) was used to enhance the ecology of the River Stour by amplifying natural processes and creating habitat. A second phase of work involving riparian tree planting is planned for 2016.

Monitoring surveys and results

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Site visits with Fisheries, Biodiversity and Geomorphology team and fixed point photography will be used pre- and post-restoration to monitor the evolution of the works over time. Still to be completed.

Lessons learnt

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Some of this work was carried out as part of a River Improvement Week in which Environment Agency staff used environmental leave days to work with colleagues from other teams as well as with volunteers from the Dedham Vale AONB. Feedback about this approach was extremely positive.

Image gallery

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Log jam in River Stour near Great Bradley

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes GB105036040980 WFD (national) typology WFD water body name River Stour 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 Yes 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) 20002,000 m <br />2 km <br />200,000 cm <br /> Project started 2015/04/01 Works started 2015/10/01 Works completed 2015/10/31 Project completed Total cost category 5000 - 10000 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 Environment Agency Trevor Bond 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 Barriers to fish migration Hydromorphology Biology Physico-chemical Water quality Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications habitat improvements, Introducing large woody debris, Improvement of natural flows Floodplain / River corridor Tree planting 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