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
Parent multi-site project
This is a parent project encompassing the following projects	No

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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. 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.

Description of Works 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.

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 de-bris;
• 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

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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

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Name	Hampshire Avon
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology	Re-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

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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

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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

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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 de-bris;
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

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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Project Briefing Note

Additional links and references

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Link	Description

Supplementary Information

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