Case study:Hedleyhope Burn

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Location: 54° 46' 56", -1° 44' 7"
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Project overview

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Status Complete
Project web site
Themes Fisheries
Country England
Main contact forename Steve
Main contact surname Hudson
Main contact user ID
Contact organisation Wear Rivers Trust
Contact organisation web site http://www.therrc.co.uk
Partner organisations
Parent multi-site project

Case_study:The River Deerness 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

Catchment

River basin district Northumbria
River basin Wear

Subcatchment

River name Hedleyhope Burn from Source to Deerness
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 309
309 m
0.309 km
30,900 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Improved grassland
Waterbody ID GB103024077290



Site

Name Cornsay Colliery
WFD water body codes GB103024077290
WFD (national) typology
WFD water body name Hedleyhope Burn from Source to Deerness
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
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

Reach length directly affected (m) 130
130 m
0.13 km
13,000 cm
Project started 2012
Works started
Works completed
Project completed 2012/09/01
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Defra Catchment Restoration Fund, Durham County Council, Durham University

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

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


Measures

Structural measures
Bank/bed modifications creation of rock pools downstream of culvert
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

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Physico-chemical quality elements

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