Thirlmere Aqueduct - Thirlmere Dam

Thirlmere Dam

The dam at Thirlmere54°33′41″N 3°04′05″W / 54.5615°N 3.0680°W / 54.5615; -3.0680Coordinates: 54°33′41″N 3°04′05″W / 54.5615°N 3.0680°W / 54.5615; -3.0680 rises 64 feet (20 m) above the old stream bed, and the reservoir when full has a surface area of 814 acres (3.29 km2), and a holding capacity of 8,235,000,000 imperial gallons (37,440,000 m3) above the level to which water may be drawn (540 O.D.) The total dry weather yield of Thirlmere Reservoir is reckoned at about 40,500,000 imperial gallons (184,000 m3) per day, out of which compensation water in respect of the area now draining into the Lake 10,120 acres (41.0 km2)), amounting to 4,658,000 imperial gallons (21,180 m3) per day average), is sent down the St. John's Beck. Manchester Corporation has acquired the drainage area of 10,800 acres (44 km2) (in addition to other lands).