Case study:Crane Meadows Meander Connections

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Location: 51° 28' 26.93" N, 0° 24' 51.32" W

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Project overview

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Status	Complete
Project web site	http://www.cranevalley.org.uk/projects/crane-aquatic-refuge.html
Themes	Environmental flows and water resources, Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Urban
Country	England
Main contact forename	Tom
Main contact surname	White
Main contact user ID
Contact organisation	London Wildlife Trust
Contact organisation web site	http://www.wildlondon.org.uk
Partner organisations
Parent multi-site project	The Crane Aquatic Refuge Project
This is a parent project encompassing the following projects	No

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Project summary

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London Wildlife Trust have undertaken meander reconnection works at Crane Meadows Nature Reserve in Cranford, Hounslow.

The meanders were cut off from the river over 100 years ago when the river was subject to heavy modifications. The London Borough of Hounslow and the Environment Agency had previously reconnected three meanders at the site. LWT's input now brings this total to five.

In addition to the meander connections a backwater area was created to improve the river's resilience to pollution events and to enhance habitat for juvenile coarse fish.

Aims of this Project

1. To increase morphological and flow diversity in the river channel leading to better quality habitat for macrophytes and benthic invertebrates and improved habitats for fish.

2. To decrease flow conveyance and increase water storage capacity, contributing to the rivers hydrological response time being reduced during periods of high flows.

3. To provide new back water areas for aquatic organisms to shelter from the main flow of the river during times of disturbance, including pollution events.

4. To increase public awareness and appreciation of the issues affecting the Crane Catchment and the techniques used to solve them via a volunteer engagement programme.

A gravel riffle will be placed just downstream of the meander inflow to ensure all water flows through the meander when river levels are low.

The bund blocking the inflow of water to the meander will be removed.

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Crane Meadows, Cranford 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 Works started 2014/09/01 Works completed 2015/09/30 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 Recent pollution events Hydromorphology Flow diversity, increase water storage capacity, reduce flood risk Biology Improve habitat quality Physico-chemical Other reasons for the project Improve public awareness Measures Edit Measures Structural measures Bank/bed modifications Riffle creation Floodplain / River corridor Planform / Channel pattern Removal of channel blockages 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