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	Joshua
Main contact surname	Robins
Main contact user ID	User:JoshRRC
Contact organisation	Eastridge Estate and Windrush AEC Ltd
Contact organisation web site
Partner organisations	River Restoration Centre
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 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.

The project appears to have been a success with many of the objectives been achieved.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 Introducing gravel, Creation of fish passes 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