Case study:Ouzel habitat improvement

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Location: 52° 1' 28.80" N, 0° 42' 51.81" W

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Project overview

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

upstream deflector

Project summary

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Section of the Ouzel in Milton Keynes. The river has modified in the past, for example, channelization works have created a more uniform channel cutting off meanders and reducing hydromorphological diversity in flow and channel bed forms.

Works over an 80m section included 3 single and 1 paired deflector. The aim of these works was to increase diversity of flows and bed profile over this section. It is anticipated that over time, underlying gravels, currently overlaid by fine sediment will be kicked up by localised scour (from deflectors) and also improve habitat quality for invertebrates and for fish spawning.

Monitoring surveys and results

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• Pre-enhancement fish survey undertaken.
• Post-enhancement surveys planned.
• River habitat assessment survey (Central Habitat Assessment)

Lessons learnt

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Image gallery

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Upstream deflector installation

Downstream paired deflectors

Downstream single deflector

File:Ouzel OU plan.pdf

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Anglian River basin Upper and Bedford Ouse Subcatchment River name Ouzel US Caldecote Mill Area category 100 - 1000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 183183 m <br />0.183 km <br />18,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105033037971 Other case studies in this subcatchment: Woughton on the Green bank stabilization 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 No Invasive species present Yes Species of interest Dominant hydrology Dominant substrate River corridor land use Recreational 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) 8080 m <br />0.08 km <br />8,000 cm <br /> Project started 2014/08/10 Works started 2014/09/10 Works completed 2014/09/10 Project completed 2014/09/10 Total cost category Less than 1 k€ Total cost (k€) Benefit to cost ratio Funding sources WFD GiA Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Environment Agency Rob Clapham Stakeholder engagement and communication Works and works supervision Less than 1 k€ Environment Agency Rob Clapham Post-project management and maintenance Less than 1 k€ Environment Agency Rob Clapham Monitoring Less than 1 k€ Environment Agency Rob Clapham 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 Increase in-channel hydromorphological diversity 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 Quantity & dynamics of flow Yes No Yes Yes No Substrate conditions Yes No Yes Yes No Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish Yes No No Yes Yes 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 Habitat mapping Yes No Yes Yes No 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