Thirlmere Aqueduct

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The Thirlmere Aqueduct was constructed by the Manchester Corporation Water Works to carry approximately 250 Ml/d from Thirlmere Reservoir to Manchester. The construction of the reservoir and aqueduct was authorised by the Manchester Waterworks Act of Parliament. The first phase was completed in 1897 and, for the pipeline sections, subsequent phases were completed in 1925.

The aqueduct is 95 miles 1642 yards long. Its most common form of construction is in cut and cover which consists of a concrete covered channel 2.16m wide and 2.16m or 2.39m high of "D" section. There are 3 3/4 miles of cut and cover section comprising approximately 300mm thick concrete horseshoe section. Typically, the conduit has one metre cover and traverses the contours of hillsides.