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

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Location: 53° 23' 35", -2° 33' 51"
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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



Site

Name Padgate Brook
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
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Desired post project morphology
Heavily modified water body No
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Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
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River corridor land use
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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
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Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology
Biology
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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)
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Monitoring

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Supplementary Information

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