Case study:Langford Lakes project

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Location: 51° 8' 10.69" N, 1° 57' 11.05" W

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Flood risk management, Land use management - agriculture, Social benefits, Spatial planning
Country	England
Main contact forename	Alasdair
Main contact surname	Maxwell
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Wiltshire Wildlife Trust, Natural England, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

River Wylye, Langford Lakes restoration

Project summary

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This area comprises a series of large lakes with the River Wylye, a chalk stream, flowing through the centre of them. Langford lakes and the River Wylye are renowned for their popularity for angling but fish populations have declined over recent years. In an attempt to trap sediment and diversify flow, a number of natural materials have been introduced to the stream. Creation of a V weir.

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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 South West River basin Hampshire Avon Subcatchment River name Wylye (Middle) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 247247 m <br />0.247 km <br />24,700 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108043022550 Other case studies in this subcatchment: Wild Wylye Phase 1 Site Edit site Name Steeple Langford WFD water body codes GB108043022550 WFD (national) typology Low, Medium, Calcareous WFD water body name Wylye (Middle) Pre-project morphology Single channel, Straight, High width:depth Reference morphology Sinuous, Pool-riffle Desired post project morphology Heavily modified water body No National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Quick run-off, Groundwater Dominant substrate Bedrock, Cobble, Gravel River corridor land use Extensive agriculture, Woodland 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 Mean annual discharge (m3/s) 0.30.3 m³/s <br />300 l/s <br /> Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 1000 m1 km <br />100,000 cm <br /> Project started 2002/10/01 Works started Works completed 2002/10/01 Project completed Total cost category Total cost (k€) Unknown"Unknown" is not a number. Benefit to cost ratio Funding sources Wiltshire wildlife trust, Natural England, 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 Hydromorphology Quantity & dynamics of flow, Connection to groundwaters, Continuity of sediment transport, Continuity for organisms Biology Fish: Disturbance-sensitive species, Invertebrates: Disturbance-sensitive species Physico-chemical Nutrient concentrations Other reasons for the project Flood risk management Measures Edit Measures Structural measures Bank/bed modifications Planting, Sediment trap building, Morphological diversification, Diversification of in-channel features, Weir construction 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 http://publications.environment-agency.gov.uk/pdf/GESW0910BSTR-E-E.pdf WFD Status for Wylye - See P. 1355. http://www.therrc.co.uk/rrc case studies1.php?csid=30 River Restoration Centre Case Study Supplementary Information Edit Supplementary Information RRC Visit Notes (2002): Most of the examples of techniques in this river have only just been put into place (the official opening of the site was 28th September 2002). It is therefore, too early to establish which are likely to provide answers in terms of best practice and whether the increase in channel diversity will have a long term benefit for fisheries objectives. Some concerns were raised during the site visit about the use of the v weir in this particular situation and it remains to be seen how successful/sustainable this will be compared to the more ‘natural’ diversity initiatives using on site materials over the longer term. The faggots and pegs appear already to have trapped some sediment behind them. They are, however, very experimental and their height, in this case (approx 40-50cm), may ultimately be most critical to their long term success. Nevertheless they may provide a possible alternative to places where toe boarding or similar structural support has been used along other rivers. This is an excellent site for viewing and discussing a range of techniques, and evaluating their effectiveness and suitability along chalk streams and elsewhere.