21. Three basins are associated with each lock chamber . 22. The new lock chambers feature sliding gates, doubled for safety, and are long, wide, and deep. 23. The 1828 design originally filled the lock chamber through the use of culverts in the lock masonry. 24. The lock chamber was long and wide. 25. The lower gages had horizontal butterfly valves in size which were used for emptying the lock chamber . 26. Two flash locks were constructed and the date 1717 is visible on one of these lock chambers . 27. A navigable sluice was constructed at Turnbridgedike, including a lock chamber which was and 17 discharge gates, each. 28. Cross culverts branch off from these main culverts, running under the lock chambers to openings in the floors. 29. Were this change done in a single lock chamber , the water volume lost would be three times as much. 30. Each lock chamber will have three water-saving basins, which will reuse 60 % of the water in each transit.