Case study:Day Brook Rain Gardens

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Location: 52° 59' 31.17" N, 1° 8' 43.60" W

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Project overview

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Status	Complete
Project web site	http://http://www.susdrain.org/case-studies/case_studies/nottingham_green_streets_retrofit_rain_garden_project.html
Themes	Flood risk management, Habitat and biodiversity, Monitoring, Social benefits, Urban
Country	England
Main contact forename	John
Main contact surname	Brewington
Main contact user ID	User:John Brewington
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Groundwork Greater Nottingham, Nottingham City Council, Severn Trent Water
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This pilot retrofit SuDS project was a result of collaboration between the Environment Agency, Nottingham City Council, Groundwork Greater Nottingham and Severn Trent Water. The construction phase was completed in May 2013.

The scheme was designed to achieve the following objectives;

•Document and evaluate the design and construction of a series of rain gardens within an existing highway setting. •Maximise surface water interception, attenuation and infiltration. •Test the effectiveness of rain gardens in managing surface water from the public highway. •Encourage participation from local residents in the design and future management of the rain gardens. •Evaluate the effectiveness of the scheme as an engagement tool around the sources of urban diffuse pollution and flood risk. •Highlight the role that retrofit SuDS can play in improving the quality and reducing the volume of surface water flowing to urban watercourses.

Monitoring surveys and results

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Lessons learnt

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Challenges and lessons learned The following challenges were managed during the project;

•Limited time to design and construct the scheme. •Varying support for the scheme amongst residents and general lack of understanding of how surface water contributes to flooding and poor water quality. •Safety concerns – residents and safety audit helped refine rain garden design.

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Catchment and subcatchment Select a catchment/subcatchment 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) 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