Case study:Moreton Channel Gravel Reprofiling

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Location: 50° 42' 27.12" N, 2° 16' 49.41" 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	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
Parent multi-site project	Case_study:River Frome Rehabilitation Plan
This is a parent project encompassing the following projects	No

Gravel reprofiling work in progress. Courtesy of Alasdair Maxwell - Environment Agency.

Project summary

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The whole of the Moreton channel reach, downstream of the main house had been identified for re-profiling. A survey undertaken showed cross-sections of a fairly uniform profile, which could be improved. Works created a range of profiles along the reach including new pools and riffles and overall a more varied morphology. This has in turn enabled the river to support a more diverse ecology including a more varied habitat for 0+ up to adult salmonids. The works involved the use of a long reach excavator to move existing bed material within the channel. No material was brought on to the site or removed. Reprofiling of channel bed to create more diverse habitat for aquatic organisms - eg. habitat suitable for fish throughout their lifecycle (spawning to adult). Some LWD debris dams installed, gravel berms and bankside gravel pinch points.

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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 Dorset Subcatchment River name Frome Dorset (Lower) & Furzebrook Stream Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 223223 m <br />0.223 km <br />22,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108044009690 Other case studies in this subcatchment: 2e Lower Woodsford River and Floodplain Enhancement, Bockhampton Enhancement, Hurst Bridge (downstream), Louds Mill (Downstream)m Enhancement, Lower Bockhampton, Lower Woodsford, Martins River Island, North Channel Upper Reach, River Frome Rehabilitation Plan, Unit 1b - Long Bridge to Downstream of Louds Mill... further results Site Edit site Name Moreton Channel WFD water body codes GB108044009690 WFD (national) typology Low, Medium, Calcareous WFD water body name Frome Dorset (Lower) & Furzebrook Stream Pre-project morphology Very little geomorphological diversity or in channel features. Reference morphology Increased channel complexity, supporting greater ecological diversity. 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 Brown trout, salmon, grayling, bullhead, minnow, brook-lamprey & stoneloach Dominant hydrology Dominant substrate River corridor land use Rural - mixed 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) 500500 m <br />0.5 km <br />50,000 cm <br /> Project started Works started 2010/09/01 Works completed 2010/09/05 Project completed Total cost category 1 - 10 k€ Total cost (k€) 7.27.2 k€ <br />7,200 € <br /> Benefit to cost ratio Funding sources Environment Agency, Frome, Piddle and West Dorset Fishery Association 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 WFD assessment determined 'poor' ecological status for waterbody. Channel restoration measure to increase morphological complexity and habitat diversity. Hydromorphology Biology Fish, Macrophytes Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bed reprofiling, Habitat diversification, Large woody derbis dams, Creation of pools, Gravel berms 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 Fish Yes Yes No Yes No Improvement Macrophytes Yes Yes No Yes No Improvement 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