A scrubber is used to remove sulfur dioxide (SO2) from the flue gas from a coal-fired power plant. The scrubber works by spraying high-pH water downward through a tower while the flue gas passes upward, transferring the SO2 from the gas to the water. The influent flue gas enters the tower at a rate of 50000 m³/h and contains 645 mg/m³ of SO2. The scrubber must reduce the SO2 in the exhaust flue gas by 90 percent to meet emission requirements. The maximum possible concentration of SO2 in the water is 820 mg/L. Calculate the required water flow rate to meet emission requirements. Assume there is no SO2 in the influent water and the air and water flow rates doe not change in the tower.