Case study:Salmonid, coarse fish and wetland bird habitat and flood plain linkage project, Hampshire Avon

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Location: 50° 46' 54.79" N, 1° 47' 30.27" W

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Project overview

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Status	Complete
Project web site	http://www.hampshireavoncatchmentpartnership.org.uk/
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Leanne
Main contact surname	Sargeant
Main contact user ID	User:H
Contact organisation	Wessex Chalk Streams and Rivers Trust
Contact organisation web site	http://www.wcsrt.org.uk
Partner organisations	Barbel society, Avon Tyrell Estate, Wiltshire Fisheries Association, Wessex Chalk Streams Project, Game and Wildlife Conservation Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

Avon tyrell post works

Project summary

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The project improved habitat for: • water meadow and wetland botanical and invertebrate communities • wading birds by improving the wetted area in adjoining fields • nesting song birds in new, very low-growing, bankside willow cover • helped trap sediment and nutrients on water meadows and within enhanced ditch systems • better wetting of water meadow systems will help buffer flood peaks on the lower Avon • Eels: improved connectivity with the floodplain and enhanced ditch systems By cleaning spawning riffles the abundance of benthic macro-invertebrates and associated fly life will increase within project areas. This will have a knock-on benefit of better food provision for fish, riparian birds and bats.

The Lower Avon Project at Avon Tyrell was completed using funding from CPAF. A total of 29 large woody debris and live hinged willows were added to the channel to encourage diversified flows and cover for Salmonids and other fish species. The 100m2 of gravel cleaning and 50m2 of cover habitat for fry and Parr were carried out. The project has created 3 backwaters at least 0.5m deep with shallow profiled margins, creating a total of 500m2 of new habitat.

The Salmonid Riffle improvements on the Nadder and Wylye involved 6 sites which were improved by the Partnership as part of this CPAF funding, with a further 3 riffles improved as part of other schemes going ahead in 2015/16. The project enhanced 300m2 of riffle gravel salmonid spawning habitat at 9 sites and created 150m2 of cover habitat for parr and fry downstream of the works.

Monitoring surveys and results

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Fish using new woody habitat at Avon Tyrell. Salmon redds on new riffles and cleaned gravels. Monitoring of juvenile fish using fry bays. Presence of coarse fish fry in fry bays. Presence of waders. Fixed point photography to show the changes made by the project. This monitoring will all help with future delivery of projects and give us demonstration sites we can show to angling clubs and landowners. The only monitoring that was not able to take place were the red counts as the weather was too severe, making the water too muddy and clouded to be able to undertake surveys.

Lessons learnt

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The collaborative working went very well, especially with building in a monitoring plan through collaboration with other Catchment Partners. The project gave some good case studies that can be used in conjunction with other angling clubs to get them delivering some of the same types of projects on other reaches in the catchment.

Image gallery

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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 Hampshire Avon Subcatchment River name Hampshire Avon (Lower) Area category 1000 - 10000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 152152 m <br />0.152 km <br />15,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB108043015840 Other case studies in this subcatchment: River Avon Stream project, Salisbury Avon Restoration Project, Strategic Framework for Restoration of the River Avon (SFfRRA) Site Edit site Name Avon Tyrell, Burcombe, Stapleford, Quidhampton WFD water body codes WFD (national) typology WFD water body name Hampshire Avon (Lower) Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation EU - Special Area of Conservation Local/regional site designations Protected species present No Invasive species present No Species of interest Salmon 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 2015/04/01 Works started Works completed 2016/05/31 Project completed 2016/05/31 Total cost category more than 10000 k€ Total cost (k€) Benefit to cost ratio Funding sources Catchment Partnership Action 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 Biology Fish: Abundance Physico-chemical Other reasons for the project Nursery habitat for coarse fish and wading bird feeding habitat. Measures Edit Measures Structural measures Bank/bed modifications The project created 150m2 of cover habitat for parr and fry downstream of the gravel cleaning works.The project also created 50m2 of cover habitat for fry and Parr. The project has created 3 backwaters at least 0.5m deep with shallow profiled margins, creating a total of 500m2 of new habitat. Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions The project enhanced 300m2 of riffle gravel salmonid spawning habitat at 9 sites.The project also carried out an additional 100m2 of gravel cleaning. 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 Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information