Case study:River Alt and Croxteth Brook Restoration Project.

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Location: 53° 27' 20.92" N, 2° 54' 24.71" W

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Project overview

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Status	In progress
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits, Urban
Country	England
Main contact forename	Helen
Main contact surname	Rawlinson
Main contact user ID
Contact organisation	The Cass Foundation
Contact organisation web site	http://www.cassfoundation.org.uk
Partner organisations	Community Forests North West
Parent multi-site project
This is a parent project encompassing the following projects	No

Work in progress - June 2014. The photograph highlights the dramatic new landform before the river went 'live' in September 2014

Project summary

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The River Alt & Croxteth Brook Restoration Project is a partnership that will use CRF funds to enable healthier, more productive and diverse ecosystems by removing culverts to create ‘renaturalised’ water courses. It will also make maintenance of the water courses easier, including the removal of rubbish and other obstructions, thus reducing the risk of flooding in the wider catchment.

Monitoring surveys and results

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Lessons learnt

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Image gallery

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Original river flowing into culvert

Pre excavation Feb 14

Pre excavation Feb 14

Inspecting channel substrate and eratics Mar 14

Exposed culvert at downstream tie in July 14

Steady progress Channel holding rainwater Sept 14

Green retaining wall at the upstream tie in Oct 14

Bank erosion before geotextile installed Oct 14

Erosion control installed Nov 14

November 14

300 people including 250 local school children planted trees Dec 14 to Feb 15

Lancashite Wildlife Trust installing the perimeter fence Jan 15

Planting heavy standards Jan 15

March 14

April 14

Big Tree Plant Dec 14

July 15

Pre planted coir pallets and rolls establishing well June 15

One of nine community mosaics embedded in the path

July 15

July 15

July 15

July 15

July 15

Upstream green retaining wall May 16

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district North West River basin Alt or Crossens Subcatchment River name Alt Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9898 m <br />0.098 km <br />9,800 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB112069060580 Site Edit site Name WFD water body codes GB112069060580 WFD (national) typology WFD water body name River Alt 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 2012/07/01 Works started Works completed Project completed 2015/03/01 Total cost category Total cost (k€) 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 Hydromorphology Channel pattern/planform, Substrate conditions Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring and survey projects 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 CRF Project briefing note - River Alt Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information