A 1-inch storm event causes runoff which feeds into a stream. In the 1.5-mile reach of the stream, the initial inflow at t1is 330 cfs and the rate of outflow is 245 cfs. After 3 hours, t2, the inflow and outflow are 210 cfs and 105 cfs, respectively. The storage at t2has been observed to be 29.5 acre-feet. Assuming a linear change in flow rates over this time period, determine the change in storage in 3 hours and the initial storage volume (allin acre-ft)