Case study:Kimpton Park

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Location: 51° 22' 31.47" N, 0° 12' 37.15" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Social benefits
Country	England
Main contact forename	Joanna
Main contact surname	Heisse
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	London Borough of Sutton
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Divert existing Pyl Brook channel near culvert entrance through Hamilton Avenue recreation ground and reconnect it into the existing watercourse 113m downstream. The total length of the diversion channel is 164m which effectively increases the watercourse length by 51m. The new channel will incorporate a sinuous channel with riffles, pools and berms. The old channel will be partially infilled and will form an undisturbed island of habitat between the new and old channels. Some of the toe boarding will be removed and used in habitat elsewhere on site. New and upgraded footpaths, wildlife flower grass areas and bridge across Pyl Brook will be provided. The site is situated within the Kimpton Industrial Area and forms part of a wider proposal to create a Linear Park around the Industrial Estate. This forms part of the UDP objectives for the Industrial area and associated environmental and recreational enhancements in the area. The works are being carried out by the London Borough of Sutton. The Environment Agency have been consulted regarding the diversion and re-routing of a section of the Pyl Brook as part of the Planning Application and the Consenting process.

Monitoring surveys and results

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Lessons learnt

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Services on the site are the primary constraints. These consist of a gas main and foul sewer with manhole which are restricting the alignment and depth of the new channel. In addition the catchment itself is a constraint. London Clay underlies the site and downstream sections. However as the catchment rises a transition occurs to more permeable Chalk. This combination of a permeable upper catchment and urban build up may have contributed to the flashy nature of the Pyl Brook. Therefore the scheme has to cope with low base flows and peaky responses during storm events.

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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 London Subcatchment River name Beverley Brook (Motspur Park to Thames) and Pyl Brook at West Barnes Area category 1000 - 10000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 172172 m <br />0.172 km <br />17,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039022850 Other case studies in this subcatchment: Anton Crescent Wetlands Regeneration, Ashlone Wharf FCRM scheme, Barn Elms Sports Ground, Barn Elms Wetland Centre, South West London, Barnes Common, Barnes Common improvements, Beverley Brook Flow control structures, Beverley Brook d/s of Rock’s Lane, Beverley Park, Cuddington Park... further results Site Edit site Name WFD water body codes GB106039022850 WFD (national) typology WFD water body name Beverley Brook (Motspur Park to Thames) and Pyl Brook at West Barnes 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) 164 m0.164 km <br />16,400 cm <br /> Project started 2008/01/01 Works started Works completed 2011/01/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources S106 EA, London Borough of Sutton the client 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 Channel pattern/planform, Width & depth variation Biology Physico-chemical Other reasons for the project Landscape enhancement, Recreation Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling Floodplain / River corridor Planform / Channel pattern Creation of new channel, Habitat creation Other Non-structural measures Management interventions Social measures (incl. engagement) Aesthetics 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