Case study:Hogsmill River Connectivity Project

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Location: 51° 21' 21.99" N, 0° 15' 27.75" W

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Project overview

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Status	Complete
Project web site	http://www.wandletrust.org/?p=4800
Themes	Environmental flows and water resources, Fisheries, Flood risk management, Social benefits
Country	England
Main contact forename	Bella
Main contact surname	Davies
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site	http://www.wandletrust.org/?page id=20
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The overall aims of the project are:
1) To resolve fish passage and associated connectivity issues, and thus improve the WFD fish status of the Hogsmill River, by the removal or modification of a series of weirs/culverts which currently seriously impede or completely prevent upstream fish movement.
2) To improve in-stream habitat in two significant stretches of the Hogsmill River, which flow respectively through the Kingston University and the Hogsmill Sewage Treatment works, and thus improve the WFD fish status of the Hogsmill River.

Monitoring surveys and results

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Lessons learnt

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Challenges: -Access to site with machinery.

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 Sewage Treatment Works phase 1, 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) Project started 2012/08/01 Works started Works completed Project completed 2013/10/31 Total cost category more than 10000 k€ Total cost (k€) 100000100,000 k€ <br />100,000,000 € <br /> Benefit to cost ratio Funding sources Defra Catchment Restoration Fund 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 Barriers to fish migration, Flood risk management, Impoundments (not hydropower) Hydromorphology Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Removal and modification of weirs and culverts Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Community involvement 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 RRC Monitoring table - Hogsmill Additional documents and videos Upload additional documents CRF Project briefing note - Hogsmill Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information