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Plate IV: Detail of dam face. Diversion pipes to left. Dam crest breach on right.

Plate V: Tunnel portal downstream

Plate VI: Fluming discharge in penstock via sediment trap

As mentioned above, the tunnel entrance and the headworks at the tunnel entrance are no longer visible. The tunnel outfall (in the upper gully of the Glen Gyle Creek) has been blocked up or has collapsed and it is not possible to enter the tunnel itself (Plate V, Site 6). The water race that the tunnel exits into is 5ft. 3in. wide (1.6m) and 3ft. 8½in. (1.13m) deep. This race is in good condition for most of its length, although quite overgrown in places. It is also difficult to follow where it crosses gullies. The water was contained in wooden fluming within this race. There are no traces of the structures that would have carried it across these gullies. The fluming carried the water for approximately 400m before it flowed into concrete penstocks (Plates VI and VII, Site 7). The nature of these penstocks is described in detail in the excerpt from the AJHR reproduced above. The AJHR report does not mention two points in relation to these penstocks. Firstly, much of the penstock structure was constructed of bricks which were then concreted over. Secondly, there was a lip on the left hand side of the structure that was designed to enable excess water to flow over. There is no significant water-course on this side of the penstocks, suggesting this did not happen often. The penstocks are in a reasonable condition, but are being damaged by trees that are growing around and through it, causing the concrete to crack significantly.

From the penstocks, the water was carried in pipes to the sluice faces. Remains of sluice pipes can be found along the course the sluice pipe

Katharine Watson Archaeology July 2003     Page 8

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