Case study:Salisbury Avon Restoration Project

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Location: 51° 3' 41.42" N, 1° 48' 1.15" W

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Project overview

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Status	In progress
Project web site
Themes	Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	John
Main contact surname	Rattray
Main contact user ID
Contact organisation	Wiltshire Wildlife Trust
Contact organisation web site	http://www.wiltshirewildlife.org
Partner organisations	Environment Agency, Natural England, Wessex Water, Wiltshire Fishery Association
This is a parent project encompassing the following projects

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Project summary

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The Hampshire Avon has historically been dredged, over-widened and impounded in many places due to past river management. This has led to a reduction in the river’s geomorphological processes, which has, in turn, led to a decline in the habitat quality and quantity throughout the reach. This decline, despite recent sympathetic management, has continued due to the lack of variation in channel form and flows, as well as riparian land use.

Description of Works This project focuses on two 750m reaches of the Hampshire Avon at Figheldean and West Amesbury, identified in the Strategic Framework for the Restoration of the River Avon (SFfRRA) as being in need of restoration for habitat quality. The restoration aims to return a more natural flow regime at the two sites, in order to promote natural bed scouring and increase riparian habitat for a variety of organisms. This will be achieved through:

• the narrowing of over-widened channels to promote bed scouring and increase Ranunculus growth;
• re-meandering of channelized sections, through the creation of berms and the use of woody debris, to restore natural deposition/erosion processes;
• introduction of woody debris to aid channel narrowing and create in-channel habitat for fish and invertebrates;
• creation of gravel riffles to create fish spawning habitat and flow variation;
• tree planting for channel shading and to provide future woody debris;
• riparian habitat creation/enhancement, such as scrape creation for invertebrate and bird life and bank re-profiling to reconnect the river to the floodplain (re-wetting wet woodland/pasture).

Each restoration project completed will act as an example to future projects in the area. Through appropriate publi-cation and engagement this project will help to raise awareness of river restoration techniques and implementation on the River Avon catchment. Restoring natural functions to the river system will also increase the potential of the river to adapt to a changing climate in the future as part of a living landscape.

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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 South Devon Subcatchment River name Avon Area category 10 - 100 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 513513 m <br />0.513 km <br />51,300 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB108046004940 Site Edit site Name Hampshire Avon WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Actively meandering 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) Project started Works started Works completed Project completed Total cost category 100 - 500 k€ Total cost (k€) 286.470286.47 k€ <br />286,470 € <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 Hydromorphology Structure & condition of riparian zone, Width & depth variation, Freshwater flow regime, Flow velocities Biology Physico-chemical Other reasons for the project Climate change mitigation, Socio-Economic Measures Edit Measures Structural measures Bank/bed modifications Creation of gravel riffles to create fish spawning habitat and flow variation Floodplain / River corridor Tree planting for channel shading and to provide future woody debris Planform / Channel pattern Re-meandering of channelized sections, through the creation of berms and the use of woody debris, to restore natural deposition/erosion processes; the narrowing of over-widened channels to promote bed scouring and increase Ranunculus growth. 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 Briefing Note Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information