Case study:River Ouse at Sharpsbridge Rock Ramp Fish Easement Project

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Location: 50° 58' 5.20" N, 0° 2' 56.53" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Water quality
Country	England
Main contact forename	Ian
Main contact surname	Dennis
Main contact user ID
Contact organisation	Royal HaskoningDHV
Contact organisation web site	http://www.royalhaskoningdhv.com/
Partner organisations	Environment Agency, Ouse and Adur Rivers Trust, C A Blackwell
Parent multi-site project	Case_study:The Middle Ouse Restoration of Physical Habitats (MORPH)
This is a parent project encompassing the following projects	No

Sharpsbridge rock ramp scheme post works © Royal HaskoningDHV

Project summary

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Sharpsbridge is a road bridge, with two culverts that carry flow under the road and an island in the channel downstream. The footings of the road bridge are formed of a solid concrete slab which acts as a weir, backing up flow. The height of the drop between the concrete slab and the water level was causing a barrier to fish passage. Previous work was undertaken to place rubble rock at the downstream extent of the concrete slab to enable fish migration; however, this began to function as an additional barrier. The aim of this project was to improve fish passage in one of the culverts, to allow free movement of fish upstream. In order to eliminate the barrier to fish passage, the water levels in the downstream weir pool were raised by the addition of a rock ramp structure.

Preparation

• The western channel was blocked using temporary dams and pumps to move water through the eastern side of the bridge. During high water flows, the dams were periodically removed to prevent flooding.

Works

• The existing rubble rock weir was removed.
• A 4.5 m wide rock ramp was constructed in-situ, using granular fill and geotextile at the base, concrete at the upstream end, and rock armour forming the surface of the ramp.
• Kentish ragstone (a hard limestone) was used for the main perturbation boulders because of its durability.
• Rocks were positioned approximately equidistant, with increasing height of rocks upstream, to ensure a smooth gradient of flow over the former head drop.

Post-construction works

• Works to rectify the site compound were undertaken. Signs were erected to divert canoeists around the eastern channel.

Monitoring surveys and results

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Lessons learnt

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• The project team was able to draw upon experience from Belgium and The Netherlands to help determine the best layout of the large boulders on the ramp.
• Carbon calculators were used, and were able to highlight the transport of materials as a high carbon cost, leading to the successful sourcing of local materials to construct the ramp.

Image gallery

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Sharpsbridge under construction (1) © Royal HaskoningDHV

Sharpsbridge under construction (2) © Royal HaskoningDHV

Sharpsbridge under construction (3) © Royal HaskoningDHV

Looking downstream post works © Royal HaskoningDHV

Looking upstream post works © Royal HaskoningDHV

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 Ouse from Cockhaise Brook confluence to Spithurst Area category 100 - 1000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 161161 m <br />0.161 km <br />16,100 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB107041012710 Other case studies in this subcatchment: Spring Meadow Meander Restoration Site Edit site Name WFD water body codes GB107041012710 WFD (national) typology WFD water body name Ouse from Cockhaise Brook confluence to Spithurst 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 2009/01/01 Works started Works completed Project completed 2012/12/31 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 Royal HaskoningDHV Stakeholder engagement and communication Ouse and Adur Rivers Trust Works and works supervision Environment Agency and C A Blackwell Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management, Impoundments (not hydropower) Hydromorphology Continuity for organisms, Continuity of sediment transport, Quantity & dynamics of flow Biology Fish Physico-chemical Oxygen balance Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Rock ramp construction 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 Environment Agency Healthy Catchments Guidance - Case Study Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information