Case study:Eastridge Estate restoration project

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Location: 51° 25' 59.06" N, 1° 32' 51.71" W

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Vaughan
Main contact surname	Lewis
Main contact user ID
Contact organisation	Eastridge Estate and Windrush AEC Ltd
Contact organisation web site
Partner organisations	Natural England, Environment Agency
Parent multi-site project
This is a parent project encompassing the following projects	No

The newly narrowed channel

Project summary

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The River Kennet was the subject overviews by the Environment Agency and Natural England. These overviews revealed that the Kennet was in an unfavourable condition with respect to its SSSI designation. Problems included barriers to fish migration, of which there were 3 major and 1 minor. Barriers usually refer to weirs which completely block any way for fish and eels to get to their spawning grounds. Weirs can also prevent the conveyance of sediments throughout a reach. The water meadows surrounding the channel were also classified as being in 'poor' condition.

The project objectives were to:

• Achieve favourable condition for the length of the Kennet through the estate.
• Achieve favourable condition for the Kennet, Lambourn and water meadows on the estate.
• Increase hydrological connectivity between the river and floodplain.
• Remove barriers to fish migration.
• Improve wild trout numbers.
• Improve the overall water quality of the fishery.

The measures used to combat these issues included the introduction of 3,000 tonnes of gravel along the profile. This was to allow for the formation of natural features such as riffles. The channel was narrowed by 5m in places to also allow for natural flows and variations withinin the channel. To address the four barriers to migration, fish and eel passes were built. Trees were cut back to reduce the amount of shade and introduce more light into the channel.

At points along the reach the banks were lowered to promote flooding onto the wetlands. Parts of the wetlands were also excavated to provide a better environment for the wildlife on the wetlands.

Monitoring surveys and results

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The project appears to have been a success with many of the objectives being achieved. There is evidence of changes to the morphology and flow patterns in the newly enhanced channel. The channel is also free of any significant impoundments, with increases in gravel bedded habitats. There also appears to be a increases in the abundance and diversity of submerged and emergent macrophytes in the channel and along its margins. Fish populations of fish have also increased and it is hoped that one day there will be a self sustaining population.

Lessons learnt

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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 Thames River basin Kennet and Pang Subcatchment River name Middle Kennet (Marlborough to Newbury) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 264264 m <br />0.264 km <br />26,400 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB106039023172 Other case studies in this subcatchment: Habitat Improvement: Stonebridge River Reserve, Og and Marlborough Fish Migration, River Kennet Restoration at Durnsford Site Edit site Name WFD water body codes GB106039023172 WFD (national) typology WFD water body name Middle Kennet (Marlborough to Newbury) 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 2012/09/01 Works completed Project completed 2013/10/01 Total cost category 100 - 500 k€ Total cost (k€) Benefit to cost ratio Funding sources Environment Agency 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 Poor river connectivity Biology Barriers to fish migration Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Creation of fish passes, Introduction of gravel Floodplain / River corridor lowering river bank Planform / Channel pattern Channel narrowing, Introducing large woody debris 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