Case study:Tanners Brook

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Location: 50° 56' 43.38" N, 1° 24' 50.80" W

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Project overview

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Status	Complete
Project web site	http://www.ecrr.org/Portals/27/Tanners%20Brook,%20Southampton.pdf
Themes	Flood risk management, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	Josh
Main contact surname	Peacock
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	Southampton Council, Arup, Southampton Golf Club
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Holly Brook is a tributary of Tanner’s Brook, a heavily urbanised watercourse which flows through Millbrook and into Southampton Water. Both watercourses are heavily modified in their lower reaches due to urban development and are subject to fluvial flooding at various locations. The Holly Brook channel has been straightened and culverted in some sections. Flow in the Holly Brook is predominantly uniform glides with a meandering planform and localised riffles and pools – overall it has limited geomorphological diversity. Further downstream it is constrained by urban development. In Southampton Golf Club the channel had been culverted, resulting in poor drainage. The 27 hole golf course is characterised by a highly managed undulating landscape with frequent copses of mature trees throughout the course. Holly Brook is currently culverted through the middle of the course, with the exception of a short stretch through a large woodland copse in the very centre of the course (designated as a Site of Importance for Nature Conservation). To the north of the golf course, the brook flows naturally through a mature woodland copse. To the south, the brook is culverted underneath Southampton Sports Centre.

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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 South East River basin Test and Itchen Subcatchment River name Tanner's Brook Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9898 m <br />0.098 km <br />9,800 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB107042016620 Site Edit site Name WFD water body codes GB107042016620 WFD (national) typology WFD water body name Tanner's Brook 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 Works completed Project completed 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 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 Measures Edit Measures Structural measures Bank/bed modifications 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