Case study:Hogsmill Sewage Treatment Works phase 1

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Location: 51° 24' 4.18" N, 0° 17' 16.08" W

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Flood risk management, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	Toby
Main contact surname	Hull
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site
Partner organisations	Natural England, Epsom & Ewell Borough Council
Parent multi-site project
This is a parent project encompassing the following projects	No

Hogsmill River Before works

Project summary

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Enhance a section of the Hogsmill through the STW by creating marginal and wetland area berms, backwaters and scrapes. This is within a wider wildlife area within the STW, encompassing wildflower grassland, tree planting and visitor interpretation trail and enhancement works to Surbiton Lagoon. Section 106 development gain from planning permission. Original scheme no longer valid so work proposed to the Hogsmill to enhance the channel edge habitat.

Monitoring surveys and results

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Photographs pre-works

Lessons learnt

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Spring 2013:
A number of large log deflectors that were placed there to attempt to improve flow and scour are currently ineffective due to the over wide channel. The Hogsmill STW phase 2 project will build on this previous work undertaken by Thames Water.

Good population of large fish, probably chub (approx 40-60cm)
Parts of the Hogsmill River support extensive aquatic vegetation and some London rarities such as small pondweed Potamogeton berchtoldii.The upper reaches have a diverse invertebrate community including some species characteristic of chalk streams. Caddisflies and mayflies have been found, as well as the more pollution tolerant beetles, freshwater shrimps and freshwater limpets.

Image gallery

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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 Hogsmill Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 192192 m <br />0.192 km <br />19,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039017440 Other case studies in this subcatchment: Bonesgate Phase 2, Elmbridge Meadows, Hogsmill River Connectivity Project, Moor Lane Allotments, River Hogsmill Restoration Project, Three Bridge, Kingston Site Edit site Name WFD water body codes GB106039017440 WFD (national) typology WFD water body name Hogsmill 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) 330 m0.33 km <br />33,000 cm <br /> Project started 2011/01/01 Works started Works completed 2011/01/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Thames Water 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 Riparian development Hydromorphology Biology Physico-chemical Other reasons for the project Recreation Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling Floodplain / River corridor Creation of wetland Planform / Channel pattern Creation of backwater 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