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.3 The storage existing in a river reach at a given time is 13 acre-ft, and at the same time, the inflow to the reach is 450 cfs and the outflow is 500 cfs. One hour later, the inflow is 500 cfs and the outflow's 530 cfs. Calculate the change in storage during the hour in cubic meters and acre-feet.

Fig: 1

Fig: 2