As a result, fifteen of them have unusually large sideways-extended pounds, to store the water needed to operate them. A final six locks take the canal into Devizes. The locks take 5–6 hours to traverse in a boat.
Fifteen of the locks are unusually large and extend sideways to store water needed for their operation. The final six locks lead the canal into Devizes.  The time required to traverse the locks is 5–6 hours.