Case study:West Amesbury

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Location: 51° 10' 10.99" N, 1° 48' 2.31" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, 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, The Piscatorial Society
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

Moor Hatches site from bridge (facing downstream)

Project summary

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The project’s aims were to undo the effects of detrimental physical alteration in the past, such as dredging and channelization; sediment issues; and loss of habitat for fish and plants. These aims were tackled through the following objectives:

Drought proofing rivers Mitigating climate change (hydrology, temperature) by reinstating natural processes of erosion and deposition and planting trees for shade and as a future source of natural woody debris.

Reducing the amount of sediment within the channel By promoting scour of the river bed through increasing flow velocity and by installing brushwood structures to act as sediment traps, the project will improve the site for salmonid spawning as well as helping to maintain the signature ‘gin clear’ waters of a chalk stream.

Create habitat for fish, plants The structures installed in this project are aimed to provide habitat for a variety of plants, fish, invertebrates, birds and mammals, either through the introduction of food in the form of woody debris and leaf matter, or the provision of spawning habitat and cover.

Monitoring surveys and results

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The project site is being monitored by the Piscatorial Society. Monitoring involves invertebrate sampling, electro-fish survey and fixed point photography. Results have yet to be analysed.

Lessons learnt

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Archaeological considerations and heavy rainfall/flooding both caused considerable delay and a change in the scope of this project. Due to the proximity of the Stonehenge World Heritage site, English Heritage was not happy with the original restoration plan, so the project was delayed to re-plan. During this time the area received record rainfall, leading to flooding which prevented work from being undertaken. For future projects, further time should be allowed to fully investigate potential archaeological issues and allow for bad weather/environmental delays.

Image gallery

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From hatches facing upstream, prior to project delivery.

From hatches facing upstream, post 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: Gunville Phase I, Longstreet A 91a, River Avon Habitat Enhancement, Fifield, River Avon at East Chisenbury 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) 400m0.4 km <br />40,000 cm <br /> Project started 2012/02/21 Works started 2012/10/01 Works completed 2013/12/02 Project completed Total cost category 50 - 100 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 Impoundments (not hydropower) Hydromorphology Flow velocities, Channel pattern/planform, Continuity of sediment transport Biology Fish, Invertebrates, Macrophytes Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Regrading of banks, Bed raising, Construction of meanders Floodplain / River corridor wetland restoration, Habitat creation Planform / Channel pattern Re-meandering, Improvement of natural flows 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 Summary Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information