A lock staircase, or riser, is defined as two, or more, adjacent locks where the upper gates of one lock serve as the lower gates of the next. This means that there are no pounds between locks and on leaving one lock the next lock in the staircase is entered immediately.
New Staircase Locks 27/28 Darnford Park
On canal line
Photo: Artist’s impression by Peter Buck of Locks 27 & 28