Case study:River Adur - Shipley weir removal

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Location: 50° 59' 2.61" N, 0° 22' 1.40" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Gareth
Main contact surname	Williams
Main contact user ID	User:Glwilliams
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	Ouse and Adur Rivers Trust and Royal HaskoningDHV
This is a parent project encompassing the following projects

Shipley weir

Project summary

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The Adur Restoration of Physical Habitat Action plan (ARPHA) aims to improve riparian habitats, restore natural river and floodplain processes, reduce downstream flooding and improve biodiversity.

The latest success for this project is the removal of Shipley tilting gate. This Environment Agency owned and maintained structure on the Knepp estate on the Western arm of the Adur was preventing fish passage and impounding the river upstream. In partnership with the Ouse and Adur Rivers Trust (OART) the South Downs Fisheries and Biodiversity team led a project to remove the gate and stabilise the clay banks with brushwood terracing. This not only removed a significant barrier to fish passage but it has also helped restore natural river processes which will be beneficial to wider biodiversity as whole. The Arun and Adur operations field team with specialist help from the Ouse operations field team were the main contractors. Using their experience of the Knepp restoration project just downstream they carried out a very professional job and were praised by the designers, OART and everyone else involved with the project. The Arun and Adur Asset Performance Team helped with the engineering aspect as well as contractor management and finance.

This project has achieved Water Framework Directive (WFD) objectives for this waterbody and is an excellent example of another successful partnership project with OART.

Monitoring surveys and results

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A fish survey was carried out before the structure was completely removed and this data will be used to compare future surveys and monitor the effects this project has had on the existing fish communities and whether the work has increased the diversity of species present in this stretch of the Adur.

Lessons learnt

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Starting this project late in the year meant we had had to pull out when the weather turned. The welfare unit left on site was repeatedly flooded costing the project up to £40,000. Lesson learnt, try and secure funding as early as possible so you can programme the works to co-incide with the nice weather.

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 East River basin Adur and Ouse Subcatchment River name R. Adur West Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 8585 m <br />0.085 km <br />8,500 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB107041012290 Site Edit site Name WFD water body codes GB107041012290 WFD (national) typology Low, Small, Calcareous WFD water body name R. Adur West 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) Project started Works started Works completed Project completed Total cost category Total cost (k€) 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 Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern 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 Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information