Milngavie Reservoir, Scotland. 

Slow flight around Milngavie Reservoir. Alt: 400ft.
Milngavie water treatment works is a Scottish Water-operated water treatment facility located in Milngavie, Scotland. It is primary source of the water for the city of Glasgow (and the Greater Glasgow area) in western Scotland. Part of the Victorian Loch Katrine water project, construction was started in 1855 and the works was opened by Queen Victoria in 1859, replacing the previous water supply sourced from the River Clyde at Cuningar Loop in Dalmarnock.