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 |