A canal lock is used to raise or lower the water level and are usually kept together in flights such as those at Bingley five rise locks.
Watch the video to know how a canal lock works as explained by Chris Hopcroft. This is a short film made for ‘The Fourteen Locks Education Through Restoration Project’. A person interested in Marine Engineering or any other pupil of a Primary school can find it very informative.
Source: Tom Maloney on Youtube