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Fasnakyle Tunnel [Outfall]

Fasnakyle Power Station, Inverness-shire.

Tunnels (20th Century), Hydro electric scheme.

"The Fasnakyle tunnel is more complex, consisting of 12,340 feet (3,760 m) of low pressure tunnel which ends at a surge shaft near a hill called Creag Liath. The tunnel passes under three streams, the Allt Blar na Gamhna, the An Cam-Allt and the Allt Innis an Droighinn, on which intakes were constructed to divert some of their flow into the tunnel. From the surge shaft, a high pressure shaft descends 340 feet (100 m), and from the bottom of the shaft, 5,025 feet (1,532 m) of high pressure tunnel descend to the power station.

In the final section, the tunnel splits into three tunnels, which are lined with steel, and each feeds a 22 MW vertical Francis turbo-alternator. The need to preserve the amenity of Glen Affric and an acute shortage of steel meant that this approach was preferable to final steel pipelines laid on the surface, and it was the first time that this solution had been used in Britain." [Wikipedia]

Alternative Names: Loch Beinn A' Mheadhoin - Fasnakyle Tunnel

Notes: Given length is the combination of the low- & high-pressure tunnels which meet at the surge shaft.

Hydrographic Feeds: Loch Beinn A' Mheadhoin

Hydrographic Resurgences: River Glass