sentences:  Bosley Reservoir, the main source of water for the canal, is situated about to the east of the flight, and a feeder supplies water to the summit pound just above the top lock.The locks are unusual for narrow canals, in that they are fitted with mitre gates at both top and bottom, as opposed to the more usual clapper top gate.The chambers are constructed from large blocks of stone, with mason's marks visible on many of them.