21. The mill has long since been demolished, leaving only a set of sluice gates . 22. There were sluice gates and arches on the western side. 23. There are also man-made hydraulic jumps created by devices like weirs or sluice gates . 24. To control water levels, sluice gates have been fitted into the two shallow pools. 25. Others swam to safety after attendants closed the sluice gates to slow the current. 26. Water can be partially diverted around a weir via an automatically controlled sluice gate . 27. At low tide the water drains through the sluice gates at Dunball by gravity. 28. Many of the dams in question do not even have sluice gates , they said. 29. There is a sluice gate at Thondamannar to prevent sea water enetering the lagoon. 30. The sluice gate tower and watchtower were dismantled in 1935.
