Dunalastair Dam Project


Perth and Kinross, Scotland


Scottish water


Dam | Water reservoir


Dunalastair Dam is located some 20km west of Pitlochry. It acts 'as a head pond and diversion weir on the River Tummel' to divert water into the Dunalastair/Tummel Aqueduct. This 'contour headrace' or lade leads to Tummel Bridge hydroelectric power station. The dam dates fom 1933 and is made of concrete and is 11m in height and 88m in length. It has two hoist operated vertical gates (7.6m square), a gravity overflow spillway (21.7m in length), 3 bays with footbridge, steel line gravity syphons (four), twin intake gates to the 4KM aqueduct, a fish ladder and various walls.

Dunalastair Water has an area of 165 hectares, being 2.5 km long and 800 metres wide at its broadest point. It was formed by the damming of the River Tummel by the Grampian Electric Supply Company in 1933 as part of the Tummel hydro-electric power scheme. The reservoir is narrow at its head, taking the form of a slender wooded glen with the Dunalastair estate situated on the northern bank. The reservoir has roads running on both its northern and southern shores. The B846, which is the road between Pitlochry and Rannoch railway station runs on the northern shore while a minor road from Kinloch Rannoch runs on its southern side. The Water is hemmed in by high ground to the north and south, with Beinn a' Chuallaich to the north and Schiehallion to the south.

The dam itself is 65 metres wide and has two floodgates and several spillways due to the quantity of water which sometimes needs to be released Into the River Tummel. The main purpose of the dam is to act as an intake which supplies water to an open 15 metre wide concrete aqueduct that runs to the south of the River Tummel. The aqueduct flows for 5 km losing very little height, keeping to the 200 metre contour before feeding the Tummel hydroelectricity power station at the head of Loch Tummel through two large pipes.


Kite supplied the site with galvanised handrail systems to secure the walkways and roof edge points used by inspectors and maintenance regularly. The system consisted of our two-ball tubular level standards posts that were fitted on the solid edges of the dam along with all the service walkways. Most of the service points were secured and protected to guarantee the highest level of safety for any site visitor.


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