Before revision: History and development Pound lock Model of early river pound lock, constructed in Lankheet water park, Netherlands The natural extension of the flash lock, or staunch, was to provide an upper gate (or pair of gates) to form an intermediate "pound" which was all that need be emptied when a boat passed through.
After revision: turf-sided Monkey Marsh Lock on the KennetAvon Canal at ThatchamTheHistory and development Pound lock Model of early river pound lock, constructed in Lankheet water park, Netherlands The natural extension of the flash lock, or staunch, was to provide an upper gate (or pair of gates) to form an intermediate "pound" which was all that need be emptied when a boat passed through.