Case study:Avon Barriers Project: Ferengair Weir

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Location: 55° 46' 3.70" N, 4° 1' 22.57" W

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Project overview

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Status	In progress
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Scotland
Main contact forename	Alan
Main contact surname	McCulloch
Main contact user ID	User:Alan.McCulloch
Contact organisation	SEPA
Contact organisation web site	http://www.sepa.org.uk
Partner organisations	Rivers and Fisheries Trusts of Scotland
Parent multi-site project	Case_study:Avon Barriers Project
This is a parent project encompassing the following projects	No

Fernegair Weir

Project summary

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Fernegair Weir is one of two barriers on the Avon Water that are the focus of the Avon Barriers Project. This project is being undertaken in partnership between The Rivers & Fisheries Trust for Scotland, SEPA, South Lanarkshire Council and the Clyde River Foundation.

Ferniegair weir is approximately 60m wide. The crest has a lower section at the left bank (looking downstream). The majority of the crest is approximately 2.5m above the downstream bed level. The structure is skewed to the direction of flow at an angle of approximately 30 degrees.

Historical maps indicate that there has been a mill on this site since at least the mid-1700s, predating the railway viaduct and the A72 bridge. It is therefore likely that there has been some form of impoundment in the river at this general site for some time. OS Mapping from an 1858 survey indicates a “dam” present at the site of the current weir, and no railway viaduct at this time (see Figure 2-3). It is estimated that the present weir was built between 1880 and 1920.

No as-built drawings are available for the structure. Previous reports suggest that the construction of the weir is timber frame, which has since been encased with a concrete apron in the 1940’s. It is believed that this was built directly onto the bedrock which outcrops along much of the reach.

Feasibility & optioneering for improving fish passage across this structure has just been completed and the options are being assessed with a view to moving forward to design and build.

Monitoring surveys and results

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The RAFTS habitat scores highlight this weir and the upstream weir at Millheugh as the highest priority barriers in the Clyde catchment. Providing fish passage will open up significant areas (up to 35km) of excellent quality habitat to migratory salmonids.

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district South East River basin New Forest Subcatchment River name Avon Water Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 8282 m <br />0.082 km <br />8,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB107042011300 Other case studies in this subcatchment: Avon Barriers Project, HLS New Forest, Holmsley Inclosure Stream Restoration Site Edit site Name Avon Water: Ferengair Weir WFD water body codes WFD (national) typology WFD water body name 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 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 Edit project background Reach length directly affected (m) Project started 2015/01/01 Works started Works completed Project completed Total cost category 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 Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Obstruction to fish Physico-chemical Poor WFD water body conditions Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir modification Floodplain / River corridor Improving fish migration Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information