Case study:Syston and Barkston Restoration

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Location: 52° 58' 37.52" N, 0° 38' 5.66" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Matt
Main contact surname	Parr
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Wild Trout Trust; Grantham Angling Association Fly Fishing Section
Parent multi-site project	Case_study:Upper Witham Restoration
This is a parent project encompassing the following projects	No

Channel narrowing and flow deflectors

Project summary

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The habitat in the Barkston Reach was also poor due to the effects of straightening, dredging and impoundment. Siltation of the over-wide riffles and the lack of cover for juvenile and adult fish were identified as key issues and addressing these was the main focus of the enhancement work. Project Objectives

• To modify the bed structure and improve in-stream habitats for fish and invertebrates, including native white-clawed crayfish.
• To stabilise eroding riverbanks and reduce fine sediment inputs caused by fluvial processes.
• Trap mobile fine sediments from agricultural and other sources.

The enhancement works were planned in two phases and designed by Environment Agency staff in consultation with Grantham Angling Association Fly Fishing Section (GAAFFS) and the riparian landowners.

The Enhancement Schemes The principal function of the works is to create sections of 2-stage channel where the river has been widened and deepened. Here a variety of channel narrowing structures have been installed just above the normal water level to create a low flow channel, but are readily over-topped as the water level rises to ensure that the capacity of the channel is not compromised. Techniques include brushwood mattresses and enclosures, log flow deflectors and vanes and tree management.

Monitoring surveys and results

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A variety of monitoring techniques have been employed to assess the impacts of the works. These include fixed point photography, along with regular visual inspections to monitor the integrity and performance of the in-stream structures. An annual programme of fine sediment and gravel sampling to monitor changes in the bed substrate has been established and native crayfish surveys will be repeated on a 2 years cycle. Annual fish surveys are already undertaken and show that the brown trout stocks are currently healthy.

Lessons learnt

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Image gallery

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Tree works

Hinged tree

Brushwood mattress

Narrowing works

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Anglian River basin Witham Subcatchment River name Upper Witham Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 4646 m <br />0.046 km <br />4,600 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105030056760 Other case studies in this subcatchment: Aubourn Rock Ramp and Habitat Works, Belton Floodplain Reconnection and River Restoration, Dysart Park, Grantham Habitat Improvement, Grantham Blue Green - Urban Reach, Little Ponton, Manthorpe Floodplain Reconnection, Papermill Weir Section in-channel restoration, River Witham Great Ponton, Stainby Road, Colsterworth, Upper Cringle Floodplain Restoration Project... further results Site Edit site Name Syston and Barkston WFD water body codes GB105030056780 WFD (national) typology WFD water body name Witham Confluence Cringle Brook to Confluence Brant Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Native Crayfish and Brown Trout 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) 2370023,700 m <br />23.7 km <br />2,370,000 cm <br /> Project started 01/09/2014 Works started Works completed Project completed Total cost category 10 - 50 k€ Total cost (k€) 2100021,000 k€ <br />21,000,000 € <br /> 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 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 Land drainage Hydromorphology Biology Fish Physico-chemical Phosphate Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Tree works including hinging and daylighting, creation of log fronted and faggot mattresses, installation of flow deflectors and vanes. 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 Project Case Study Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information