Water water everywhere and not a drop to drink

Hunts Lock in Northwich, 2 narrow boats in the lock plus this cabin cruiser which meant they were stuck at the back which was close enough as the lock keepers shut the lock gates but it got decidely tricky as the water lowered and the leak on the back lock gate became obvious, apparently the next set of locks has a worse lock gate leak but these pair were going to stop off in town at the service point to clean there tanks out.