Case study:Strategic redistribution of channel substrate

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Location: 52° 1' 30.76" N, 0° 42' 49.15" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Urban
Country	England
Main contact forename	Rob
Main contact surname	Clapham
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	The Parks Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This project was a follow-up from a previous project (Ouzel habitat improvements). Original project used large wooden deflectors in the channel to clean underlying gravels and kickstart natural process. However, the wood used was too small, and the channel over-large and -modified for the deflectors to be instigate significant change.

This project used a long reach excavator to re-form the channel, creating a series of deeper pools and riffle sections, where previously, the channel was wide, shallow and uniform in both flow and bed morphology.

There was evidence of water vole activity at this site, therefore banks were left untouched and the 'shoulder' or pinch-point' features were detached from the bank leaving a 30 cm 'gutter'. This prevented the possibility of any water voles becoming entombed in the bank. Following the work faggot bundles will be installed in these gutters to allow gradual build up of sediment an development of vegetation in the gaps.

Monitoring surveys and results

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Ongoing fish surveys are being undertaken at this location, as well as habitat assessment.

Lessons learnt

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name River Ouzel (Open University) WFD water body codes GB105033037971 WFD (national) typology Low, Medium, Calcareous WFD water body name Ouzel US Caldecote Mill Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present Yes Species of interest Dominant hydrology Dominant substrate River corridor land use Recreation grassland / grazed Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m 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) 150150 m <br />0.15 km <br />15,000 cm <br /> Project started 2015/10/28 Works started Works completed Project completed Total cost category Less than 1 k€ Total cost (k€) Benefit to cost ratio Funding sources Parks Trust 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 Follow up from a previous project - wooden deflectors used were too small and river too wide for deflectors to cause change Measures Edit Measures Structural measures Bank/bed modifications Long-reach excavator, Creation of pools and riffles 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