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Knowle Locks on the Grand Union Canal
Originally there were six narrow locks here. During the extensive upgrading of the Grand Union Canal in the early 1930s these were replaced by the five wide locks in which pairs of boats could navigate together, side by side. Remnants of the original structures can still be seen to the east of several of the current locks.
Side ponds were installed alongside each lock in order to optimise efficiency in the use of water. Pairs of ground paddles can still be seen by each lock, though the sideponds are no longer in use.
The locks are numbered 47 to 51 starting from the bottom of the flight.
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