Case study:Creamery Weir fish barrier easement

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Location: 54° 52' 23.38" N, 4° 4' 4.97" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology
Country	Scotland
Main contact forename	Rob
Main contact surname	Mitchell
Main contact user ID	User:Robmitchell
Contact organisation	RAFTS
Contact organisation web site	http://www.rafts.org.uk
Partner organisations	Galloway Fisheries Trust, SEPA
Parent multi-site project
This is a parent project encompassing the following projects	No

Creamery Weir before removal

Project summary

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This project aimed to overcome a barrier to migratory fish to allow access to over 10km of habitat. A feasibility and options report led to the selection of removal as a preferred option. Design of the removal option took place in Winter 2015/2016, and the removal process began in August 2016 (completing within one month).

There were significant volumes of sediment that had accumulated behind the weir so the project had a strong element of hydromorphological restoration, as well as enabling fish passage. Any large stone located within the sediment was reused to create rock steps in the new channel, with the remainder being disposed of in line with waste regulations. These also acted as bed checks to guard against upstream incision, although in reality plentiful bedrock outcrops also served this purpose.

A disused sluice gate downstream of the weir site was also removed to ensure effective fish passage.

Finally, the left bank of the river channel is relatively steep and a public road is situated at the top of it. In order to stabilise this bank and guard against erosion, mixed seed-impregnated erosion protection matting has been installed.

Monitoring surveys and results

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Removal took place relatively recently, and so monitoring has yet to be undertaken. Site visits are planned for early 2017, and in the longer term Galloway Fisheries Trust will carry out electrofishing surveys upstream of the site in order to compare the data with pre-works survey results.

Lessons learnt

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It was difficult to identify a cost-effective and reliable method of determining the original bed level beneath significant amount of stored sediment upstream of the weir. The final decision was to remove the sediment in a careful and 'staged' manner, ensuring that hydromorphological expertise was on site to determine the point at which the original bed level was reached. This made it difficult to estimate clear costs of sediment disposal, but estimates proved relatively reliable.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 2014/09/01 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 Impassable barrier to migratory fish Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal Floodplain / River corridor 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