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Galloway Fisheries Trust

Fisheries House, Station Industrial Estate, Newton Stewart, Dumfries & Galloway, Scotland. DG8 6ND
Telephone: 01671 403011 · Fax: 01671 402248 · Scottish Registered Charity No. SC020751

Looking downstream on the River Cree

Brown Trout

Looking upstream on the River Bladnoch

Felling of commercial forestry in Galloway Forest Park

Looking upstream on the River Luce

North American Signal Crayfish

The sandy beach at Loch Grannoch

Belted Galloway Cattle, or 'Belties'

Fly fishing on the River Cree

Murray's Monument

A small upland burn

A stoneloach

The High Cree, looking towards Cairnsmore of Fleet

A small waterfall on the Buchan Burn

A salmon from the Kirkcudbrightshire Dee

Tongland compensation flow study

02 July 2013

One of the most significant bottlenecks at the top of the ‘Long Trough’

One of the most significant bottlenecks at the top of the ‘Long Trough’

A section of wide, shallow water that may also hinder fish movement beneath the fish ladder

A section of wide, shallow water that may also hinder fish movement beneath the fish ladder

We recently undertook a series of flow trials at Tongland to provide some baseline data into attraction flows required to assist adult migratory fish up the lower stretch of river between Tongland Power Station and Tongland fish pass. This area of the river has been highlighted as a key area for a review of the current compensation flow regime and freshet releases in light of the recent Galloway Hydro CAR licence review undertaken by SEPA.


On the first day of the study, the compensation valve of Tongland Dam was closed so that the channel could be investigated under a minimum flow of 5 mgd released via the fish pass. Once the channel had been walked at this flow, a number of areas were highlighted (including natural falls and wide shallow sections) where it is expected adult fish may encounter at least a delay in passage as they ascend the river towards the fish pass. A series of measurements were taken at these bottlenecks under the minimum flow. After which, the compensation valve was opened fully and the river channel surveyed under maximum flow of 32 mgd, provided through the compensation valve and fish pass.


Two further days of trials focussed at looking at the problematic sections under a range of intermediate flows that included the current statutory compensation flow of 15 mgd provided through the compensation valve and fish ladder.


A report is being provided to Scottish Power and the Dee DSFB on the findings of this survey work and Rowan would like to thank Scottish Power staff, Jim Storrie from SEPA and Tim Ewing, head bailiff on the Dee who assisted in this work over much of the three days.


SEPA plan to complete their own data collection to help assist in a review of the current Water Framework Directive classification of the lower Dee (which currently meets Good Ecological Potential). A number of electrofishing sites are hoped to be surveyed on the lowest classification section (between Glenlochar Barrage and Tongland Power Station) during August, weather permitting.


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