Case study:Drayton

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Location: 52° 30' 55.05" N, 0° 47' 13.34" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Environment Agency Customer Contact
Main contact surname	Anglian Northern Area
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Welland Rivers Trust, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The scheme was implemented by the Environment Agency with the co-operation and agreement of the adjacent landowners (Matthew and Melanie Robinson and Alister Brooke-Clarke) and in-kind support from the Welland Rivers Trust and the Wild Trout Trust.

Summary of Techniques: Faggot, woody debris and coir roll flow deflectors; channel pinching using faggots, woody debris and coir rolls; introduction of gravels to augment and create riffles; bank toe protection using rock and coir; new cattle drinkers; riverside fencing; selected tree works including crown-lifting and pollarding; new tree and shrub planting; artificial otter holt construction.

Background During the 1970s the River Welland was significantly modified. The natural river morphology was altered to improve land drainage and flood water discharge. The river was deepened; many meanders, pools, riffles and glides were removed; and the river was constricted within high, straight banks. High winter flood flows and poor land management practices now cause significant bank erosion and sedimentation. Prior to modification a high proportion of these nutrient-rich sediments would have been deposited on the floodplain, providing rich grazing pasture, but, as a result of the flood defence works, a large proportion of these sediments now remain in the channel, degrading habitats including fish spawning gravels.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Site Edit site Name River Welland downstream of Ashley gauging station WFD water body codes GB105031050580 WFD (national) typology Calcareous WFD water body name Welland Pre-project morphology Straightened, Over deepened, Low gradient passively meandering, Pool-riffle, Run-glide Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation EU - WFD protected area (drinking water, shellfish etc.) Local/regional site designations Protected species present Yes Invasive species present No Species of interest otter; brown trout Dominant hydrology Dominant substrate Gravel River corridor land use Improved/semi-improved grassland/pasture 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) 17001,700 m <br />1.7 km <br />170,000 cm <br /> Project started Works started 2011/09/01 Works completed Project completed 2011/12/01 Total cost category 50 - 100 k€ Total cost (k€) 7070 k€ <br />70,000 € <br /> Benefit to cost ratio Funding sources Environment Agency 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 Flood risk management, Land drainage Hydromorphology Continuity of sediment transport Biology Fish Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Creation of deflectors, Bank stabilisation, Introducing gravel, cattle drinkers Floodplain / River corridor Tree planting, tree management Planform / Channel pattern Channel narrowing Other Non-structural measures Management interventions Fencing 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 Substrate conditions No No No No No Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish Yes No No No No Invertebrates Yes No No No No 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 Drayton case study Additional links and references Edit links and references Link Description http://www.ecologylink.com Ecology Link Ltd - Ecological survey and scheme design http://www.water-lines.co.uk Water-Lines Solutions - supplied the coir rolls Supplementary Information Edit Supplementary Information