Filter Ducting Sluice Gate helps in controlling a sluice that is designed to seal in one direction and commonly is used to control water levels and flow rates in rivers and canals. These are used in wastewater treatment plants. Filter Ducting Sluice Gate can be used to control and measure volume flow rates in open channels and rivers, primarily in connection to hydropower plants. These are often used to measure flow rate in open channels. These are also often used to modulate flow.