This culvert extends out to Harperrig Reservior

Culvert - https://www.openstreetmap.org/way/352160680

Reservior - https://www.openstreetmap.org/way/43267111

Water from Harperrig was historically used to feed the Water of Leith and its many mills.

Some water was diverted to Cubbiedean and Torduff reservoirs to be used as drinking water in Colinton. 