Case study:Hedleyhope Burn

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Location: 54° 46' 56.48" N, 1° 44' 6.98" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Completed rock ramp easement. Photograph courtesy of the Wear Rivers Trust

Project summary

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The River Deerness catchment has multiple WFD failures, for both fish and water quality. Funding from the Catchment Restoration Fund as well as Durham County Council and Durham University allowed for the provision of a rock pool fish easement at a road culvert on at Cornsay Colliery located on Hedleyhope Burn (a tributary of the River Deerness), completed in September 2012. Hedleyhope Burn is 9.2km in length. The road culvert has been cutting of fish access to 5km of good quality habitat, as under most flow conditions the culvert becomes impassable. This 30m corrugated steel pipe has rapid and shallow uniform flows when water levels are low, and concentrated high velocity flows at high water levels. An extensive erosion pool at the downstream exit to the culvert exhibits the force of water leaving the culvert. A wide concrete step 15 to 20 cm above the surface of the water also obstructs fish passage into the culvert. The solution was to replace the existing scour pool with a series of rock pools to provide a variety of flows for fish, as well as drowning out the concrete step by increasing water levels back into the culvert and creating a slower and deeper flow, improving fish passage. Flood risk was not increased as the site is in a deep depression with no buildings close by. The site is owned by Durham County who also contributed half of the cost. The Wear Rivers Trust helped with the design of the rock pool easement. Due to the location in a high rainfall upland area, 2-3 tonne rocks were used to form a continuous line of bank protection to protect the site a high flow levels. Larger gravels were also used, and willow spiling is due to be installed at a later stage.

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Catchment and subcatchment

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Site

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Name	Cornsay Colliery
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Closed culvert
Reference morphology	Bedrock cascade
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	Improved/semi-improved grassland/pasture
Average bankfull channel width category
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Project background

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Reach length directly affected (m)
Project started	2012
Works started
Works completed
Project completed	2012/09/01
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Benefit to cost ratio
Funding sources	catchment restoration fund, Durham county council and Durham University

Cost for project phases

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Reasons for river restoration

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Mitigation of a pressure	Barriers to fish migration
Hydromorphology	Continuity for organisms, Continuity of sediment transport
Biology	Fish
Physico-chemical
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Measures

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Structural measures
Bank/bed modifications	creation of rock pools downstream of culvert
Floodplain / River corridor
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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Monitoring documents

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Image gallery

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Additional documents and videos

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WR KT A4 Cornsay.pdf

Additional links and references

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Supplementary Information

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