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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Catchment and subcatchment

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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

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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

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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

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

Measures

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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

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quality elements

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

Biological quality elements

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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

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

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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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

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