Case study:Mill Road Weir, Pontypool

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Location: 51° 42' 38", -3° 2' 58"
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Project overview

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Status Planned
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://groundworkwales.org.uk/
Partner organisations Natural Resources Wales
This is a parent project
encompassing the following
projects
Photo of weir before work carried out

Project summary

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Healthy Rivers will install a fish pass ramp on the weir to improve fish migration upstream. Currently the weir poses a barrier to upstream fish migration particularly to smaller fish. The ramp in the centre of the weir will create an attractive flow of water and will reduce the need for migrating fish to leap out of the water to get over the weir. Healthy Rivers will also install eel mats on a wing wall beside the weir to improve access upstream for elvers.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Severn
River basin South East Valleys

Subcatchment

River name Afon Lwyd - source to conf Dowlais Bk
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 500 - 1000 m
Maximum altitude (m) 575
575 m
0.575 km
57,500 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Acid Grassland
Waterbody ID GB109056032910



Site

Name Mill Road Weir
WFD water body codes GB109056032912
WFD (national) typology
WFD water body name Afon Llwyd
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 Parkland and housing
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 more than 0.1
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 10
10 m
0.01 km
1,000 cm
Project started 2016/01/02
Works started
Works completed
Project completed
Total cost category 1 - 10 k€
Total cost (k€)
Benefit to cost ratio
Funding sources Natural Resources Wales

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 1 - 10 k€ Groundwork Wales Hywel Abbott
Post-project management and maintenance Natural Resources Wales
Monitoring Natural Resources Wales



Reasons for river restoration

Mitigation of a pressure Barrier to fish migration
Hydromorphology Heavily modified
Biology poor
Physico-chemical
Other reasons for the project improve fish migration


Measures

Structural measures
Bank/bed modifications Weir modification
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

Element When monitored Type of monitoring Control site used Result
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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