Suppose that a water treatment plant has a Parshall Flume with a 4 ft wide throat. a) If the upstream depth of the water (ha) is 1 ft and the depth of the water in the throat section (hb) is 0.65 ft, what is the flow rate in gpm? b) If ha is 0.60 ft and hb is 0.48 ft, what would be the flow rate in gpm?