Case study:Padgate Brook River Restoration - part of the Warrington FRM Scheme

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Location: 53° 23' 34.83" N, 2° 33' 50.94" W

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/10_padgatebrook.pdf
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits
Country	England
Main contact forename	Connor
Main contact surname	McIlwrath
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Warrington Borough Council
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Padgate Brook lies to the east of Warrington town centre (Map 1). It is a small watercourse which feeds into the River Mersey. The brook has been subject to a number of alterations over the years to reduce flood risk. One of the main changes was to straighten and deepen the brook through the Twiggeries and construct flood embankments along both banks. This effectively cut off the brook from the adjacent floodplain (Photo 1 and Appendix 1). As part of the Warrington Flood Risk Management (FRM) Scheme, Padgate Brook has been restored to a more natural course and the embankment along the left bank has been removed. This has created a more natural river system and allows water to spill onto the floodplain on a regular basis. This approach has improved the level of flood protection for the surrounding properties to a 1 in 100 year level and has restored 5ha of reedbed. Key facts: the scheme has reduced the risk of flooding to over 200 properties; the natural approach fits in with the character of the site avoiding the use of heavy engineering in a green space; maintenance requirements have been significantly reduced by creating a self-cleansing channel and using a wildflower mix on the set back embankment; restored 500m of the watercourse and 5ha of reedbed; created a sustainable FRM system.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Padgate Brook WFD water body codes WFD (national) typology WFD water body name 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 2015 Works started Works completed Project completed Total cost category Total cost (k€) £250k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Environment Agency Grant in Aid, Environment Agency Flood and Coastal Risk Management, Warrington Borough Council 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 Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Removal of embankments, Floodplain reconnection, Reedbed creation 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