Case study:Gunville Phase I

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Location: 51° 13' 14.48" N, 1° 46' 51.48" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Martijn
Main contact surname	Antheunisse
Main contact user ID	User:Martijnantheunisse
Contact organisation	Wiltshire Wildlife Trust
Contact organisation web site	http://www.wiltshirewildlife.org
Partner organisations	Environment Agency, Natural England, Wessex Water, Wiltshire Fishery Association
Parent multi-site project	Case_study:Strategic Framework for Restoration of the River Avon (SFfRRA)
This is a parent project encompassing the following projects	No

Gunville Phase I

Project summary

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Commissioned by Wiltshire Wildlife Trust and funded through a successful Catchment Restoration Fund bid, Cain Bioengineering submitted a very professional interpretation for the 750m stretch of river, incorporating a mixture of geotextile and earth back-fill berms, brushwood sediment traps, gravel riffles, large woody debris and live tree hinging. The general theme of the works was remeandering, channel narrowing and bank regrading. The creation of off-line ponds provided fill for the geotextile berms and created valuable riparian habitat. Due to the nature of the site and the partners involved (being part of the MoD training estate, with fishing rights given to theServicesDry Fly Fishing Association (SDFFA)), stakeholder consultation was crucial in the on-going development of the project. As a result of this consultation and mitigation for Water vole (Arvicola terrestris), designs had to be adapted several times during the project, leading to a bespoke, dynamic restoration which should be readily able to withstand the variety of pressures faced by the river.

Monitoring surveys and results

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Monitoring consists of invertebrate surveys, electro-fish surveys and fixed-point photography. Data was collected throughout 2013 and 2014 through volunteer effort. Results have yet to be analysed.

Lessons learnt

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Future projects should incorporate time for delays such as flooding, water vole mitigation and other potential difficulties. Despite not being public land, improved communications with local residents would have made progress much smoother.

Image gallery

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Upstream of Gunville hatches, prior to project delivery

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 Hampshire Avon (Upper) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 212212 m <br />0.212 km <br />21,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108043022350 Other case studies in this subcatchment: Longstreet A 91a, River Avon Habitat Enhancement, Fifield, River Avon at East Chisenbury, West Amesbury Site Edit site Name WFD water body codes GB108043022350 WFD (national) typology WFD water body name Hampshire Avon (Upper) 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) 750m0.75 km <br />75,000 cm <br /> Project started 2012/06/01 Works started 2012/10/10 Works completed 2012/11/16 Project completed 2012/12/13 Total cost category 100 - 500 k€ Total cost (k€) Benefit to cost ratio Funding sources Catchment Restoration Fund 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 Over-wide, over-deep dredged channel with little flow variability Biology Poor species diversity Physico-chemical Other reasons for the project Impoundment from downstream hatch structure Measures Edit Measures Structural measures Bank/bed modifications Restoring gravel bed, Introducing large woody debris Floodplain / River corridor lowering river bank, Wetland habitat Planform / Channel pattern Enhancing flow diversity, Habitat restoration, Meandering channel Other Non-structural measures Management interventions Flow management Social measures (incl. engagement) Awareness raising 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