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Site Records

Subterranea Scotia

Clachan Power Station - Surge Pond

Clachan Power Station sign


The surge shaft at Clachan is an inclined shaft, 20' in diameter and sloping at 39 to the horizontal, in line with the pressure shaft to the power station which lies below it, as the following illustration should make clear:

Clachan surge shaft and pressure shaft

Illustration: Clachan surge shaft and pressure shaft
Illustration by: Scanned by Mike Ross, from 'The Engineer', April 1956


A more detailed illustration of the area of the surge shaft, pond, expansion gallery, and construction adit (this is really best viewed at high-resolution; click on the image and a high resolution version will be displayed):

Clachan surge shaft and surge pond

Illustration: Clachan surge shaft and pond
Illustration by: Scanned by Mike Ross, from 'The Engineer', April 1956


A General view of the surge pond, high on the hillside above Loch Fyne. A slight hollow closed by a small dam, at the right side of the pond is the end of the aqueduct bringing water from the Kilblaan catchment. The top of the surge shaft itself is below the large concrete sructure covered with metal joists and grille.

Clachan surge pond

Photo: Clachan surge pond
Photo by: Mike Ross


Another view of the surge pond, taken from on top of the Kilblaan aqueduct, which is flowing beneath the concrete slabs.

Clachan surge pond - Kilblaan aqueduct

Photo: Clachan surge pond
PPhoto by: Mike Ross


This view is taken standing on the concrete structure atop the surge shaft, looking through the grille. The shaft was in fact surging on the occasion of this visit, the water level rising and falling with a period of approximately 5 minutes. Here it is at the top of the surge...

Clachan surge shaft - high water

Photo: Clachan surge shaft
Photo by: Mike Ross


As the level drops, the top of the shaft becomes visible...

Clachan surge shaft - water level dropping

Photo: Clachan surge shaft
Photo by: Mike Ross


...now the water is at its lowest level, perhaps 60' down the shaft. The cascade of water flowing down the shaft represents the inflow from the Kilblaan catchment.

Clachan surge shaft - low water

Photo: Clachan surge shaft
Photo by: Mike Ross

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Last updated 5th March 2003
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