Case study:Poyle channel enhancement and weir removal

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Location: 51° 28' 38.80" N, 0° 30' 49.59" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Usha
Main contact surname	Chapman
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Primary objectives - Manage flood risk; improve upstream habitat; manage water level; reduce backwater effect
Secondary objectives - Improve fish passage; reprofile reach; narrow watercourse; raise natural bed level; naturalise bank side; marginal ecology improvement; in-stream diversity increase and naturalise flow regime Biodiversity enhancement and weir removal project.

Monitoring surveys and results

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Photographs pre-works

Lessons learnt

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A difficulty may be in ensuring that flows in the complex Lower Colne system do not cause flooding elsewhere, as well as the access and cost of the proposed project. It had prior to the last LRAP update in August 2010, been mothballed.

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 Colne Subcatchment River name Colne Brook (from confluence with Alderbourne to confluence with Horton Brook) Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 7070 m <br />0.07 km <br />7,000 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB106039023010 Site Edit site Name WFD water body codes GB106039023010 WFD (national) typology WFD water body name Colne Brook (from confluence with Alderbourne to confluence with Horton Brook) 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) 500 m0.5 km <br />50,000 cm <br /> Project started 2008/01/01 Works started Works completed Project completed Total cost category 50 - 100 k€ Total cost (k€) Benefit to cost ratio Funding sources FRM capital works 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 Barriers to fish migration, Flood risk management Hydromorphology Quantity & dynamics of flow Biology Fish Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Weir removal Floodplain / River corridor Planform / Channel pattern Creation of pools and riffles 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