Case study:Marine Colliery river blockage

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Location: 51° 43' 7.31" N, 3° 9' 45.46" W
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity
Country Wales
Main contact forename Hywel
Main contact surname Abbott
Main contact user ID User:Hywel Abbott
Contact organisation Groundwork Wales
Contact organisation web site http://www.groundworkwales.org.uk
Partner organisations Natural Resources Wales
This is a parent project
encompassing the following
projects
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Project summary

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A large tree has fallen across the river channel and become trapped against the main trunk sewer that crosses the river. The branches of the trapped tree had collected a large quantity of floating debris including tree branches, large items of litter, shopping trolleys, tyres and large amounts of small litter items. The build of debris had created a dam in the river channel creating an impassable barrier to fish migration and a major eye sore in the river.

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Lessons learnt

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Catchment and subcatchment



Site

Name Marine Colliery
WFD water body codes GB109056032900
WFD (national) typology
WFD water body name Ebbw R - source to conf Ebbw Fach R
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 Yes
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category 5 - 10 m
Average bankfull channel width (m)
Average bankfull channel depth category Less than 0.5 m
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) 3030 m <br />0.03 km <br />3,000 cm <br />
Project started 2015/08/26
Works started
Works completed
Project completed 2016/09/14
Total cost category Less than 1 k€
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 Less than 1 k€ Groundwork Wales Hywel Abbott
Stakeholder engagement and communication Less than 1 k€ Groundwork Wales Hywel Abbott
Works and works supervision Less than 1 k€ Groundwork Wales Hywel Abbott
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Barriers to fish migration
Hydromorphology
Biology Moderate
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
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

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

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

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Before measures After measures Qualitative Quantitative


Monitoring documents



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Additional links and references

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Supplementary Information

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