2-645-356 - © CM Dixon/Heritage Images

Plantation and Filter station on East bank of Thirlmere, Cumberland, 20th century. Thirlmere is a reservoir in the Borough of Allerdale in Cumbria and the English Lake District with a filter station and dam at the northern end. Constructed in the 19th century by the Manchester Corporation to provide the industrial city of Manchester with water supplies, the 96 mile-long Thirlmere Aqueduct still provides water to the Manchester area.