Case study:Sainsburys, Hertford

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Location: 51° 47' 53.23" N, 0° 4' 47.69" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Sarah
Main contact surname	Smith
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
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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Removal of sheet steel piling and reprofiling and naturalisation of the bank for 120m. Remaining sheet piling which cannot be removed will be brick clad and coir rolls placed at base of piling. Redevelopment of site for a Sainsburys supermarket on the banks of the River Lee.
Funding and commitment to delivery. Flood Defence Consent has been granted and works are due to start on site imminently; Expected duration of works is 2 months.

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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 Upper Lee Subcatchment River name Lee Navigation (Hertford and Ware) Area category 100 - 1000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 113113 m <br />0.113 km <br />11,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB106038033240 Other case studies in this subcatchment: Amwell Loop Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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) 150 m0.15 km <br />15,000 cm <br /> Project started 2011/01/01 Works started Works completed 2011/01/01 Project completed Total cost category 500 - 1000 k€ Total cost (k€) Benefit to cost ratio Funding sources Private developers 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 Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Installation of coir rolls, Removing of sheet piling 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