Case study:Habitat Improvements on the River Colne at West Drayton
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- 1 Project overview
- 2 Image gallery
- 3 Catchment and subcatchment
- 4 Site
- 5 Project background
- 6 Reasons for river restoration
- 7 Measures
- 8 Monitoring
- 9 Additional documents and videos
- 10 Additional links and references
- 11 Supplementary Information
|Project web site|
|Themes||Fisheries, Habitat and biodiversity|
|Main contact forename||Phil|
|Main contact surname||Belfield|
|Main contact user ID|
|Contact organisation||Environment Agency|
|Contact organisation web site||http://www.gov.uk/government/organisations/environment-agency|
|Partner organisations||Environment Agency, West Drayton Angling Club|
|Parent multi-site project|
| This is a parent project
encompassing the following
Overall aims included:
- Increase survival rate of juvenile coarse fish by increasing amount of suitable habitat.
- Increase variety of in-channel habitat throughout the previously dredged section to provide habitat for juvenile and adult coarse fish.
Specific aims were:
- Create backwaters in low ground along the true right bank.
- Create new marginal habitat amongst areas of heavy siltation on the true right bank.
- Open up old ditch that used to flow in the smaller u/s weir pool.
- Add localised gravel shoals to the river bed.
Description of works:
- Creation of projections using coir rolls along line of silt deposition boundary, open at downstream end and lightly planted to create shallow marginal habitat for juvenile fish.
- Raise bed in localised areas using gravel shoals to add variety to instream habitat. Shoals should strengthen natural features where deposition is occurring naturally. Mitigate loss of water holding areas by creating backwaters.
- Use present low lying land and re-open old features that have become filled in and overgrown. New wetted ditch to provide alternative migratory route for coarse fish and extend type of habitat found in Bigely Ditch.
- If possible lower height of sluices at mill or footbridge. - Dredging in 1998 resulted in loss of habitat suitable for juvenile fish including loss of marginal habitat by siltation.
- Enhancements have potential to extend wet-woodland and increase potential water vole habitat.
Monitoring surveys and results
River Habitat Survey
River Corridor Survey
Catchment and subcatchment
Select a catchment/subcatchment
Other case studies in this subcatchment: Colne Brook, Fishery/habitat enhancement on the Grand Union Canal, Uxbridge Moor Backwater
Cost for project phases
Reasons for river restoration
Hydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Additional documents and videos