Case study:Water of Dye Fish Pass Project

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Location: 56° 56' 22.97" N, 2° 37' 41.45" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries
Country	Scotland
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation	River Restoration Centre
Contact organisation web site
Partner organisations	River Dee Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

River Dee Trust fish passage easement through two manmade obstructions on the Water of Dye (works in 2008).

Project summary

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The Water of Dye is a tributary of the Water of Feugh - itself a tributary of the River Dee. 15km along the 26km length of the Dye are two weirs - the upper acting as a partial impoundment to supply a nearby drinking water storage reservoir and the lower Crump weir acting as a flow accelerator for flow monitoring purposes.

Fisheries surveys conducted between 1997 and 2006 showed that the weirs were acting as significant barriers to upstream Atlantic salmon migration - cutting off 11km of good spawning and nursery habitat.

In 2008, two fish passes were installed on the two weirs. This initially involved constructing pre-weirs below the pre-existing weir structures, in order to raise tailwater levels to ease fish passage. In addition, the upper weir also had a 'step-pool' pass installed, as the weir was deemed to be particularly steep for fish passage. This allowed to fish to climb the weir in two 'jumps'.

In order to determine the ecological success of the project, the River Dee Trust conducted pre/post-restoration electro-fishing surveys, to track any changes in fish abundance above and below the weirs. These surveys determined the following:

- Statistically significant increase in salmon parr above the weir in 2010 and 2011, compared with pre-restoration baseline.

- In 2011, salmon parr numbers u/s of weir were found to be not statistically different to abundances d/s for the first time - indicating that the fish pass had been successful in promoting free u/s passage for spawning.

- Decline in trout fry and parr above weir following fish pass installation, however the control site d/s showed no significant decline. Possibly due to outcompetition for habitat and territory by salmon, which are naturally far more suited to the habitat. A similar issue was seen following fish pass installation on the Tweed.

Monitoring surveys and results

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Lessons learnt

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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 North East Scotland River basin Dee Subcatchment River name Water of Dye Area category 10 - 100 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 778778 m <br />0.778 km <br />77,800 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Upland Moorland/Grassland Waterbody ID Site Edit site Name Water of Dye WFD water body codes 23329 WFD (national) typology Small, Mid, Organic WFD water body name Water of Dye - upper catchment 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 Salmon, brown/sea trout Dominant hydrology Dominant substrate Peat/Bedrock River corridor land use 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 Edit project background Reach length directly affected (m) Project started 2008 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Life-Nature Conservation of Atlantic Salmon in Scotland 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 River Dee Trust Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Installation of fish passes in two existing weirs 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 Fish Yes Yes No Yes Yes Improvement 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 http://www.riverdee.org.uk/FileLibrary/Content/Publications/2012%20Survey%20Bulletin Dye%20fish%20passes.pdf River Dee Trust - 2012 Bulletin http://www.riverdee.org.uk/FileLibrary/Content/Publications/Dye%20fish%20passes%202011 %20survey%20bulletin.pdf River Dee Trust - 2011 Bulletin Supplementary Information Edit Supplementary Information