A 600 ha watershed receives annual rainfall of 2, 500 mm. The average annual evapotranspiration from the watershed is 1, 100 mm and 700 mm/yr infiltrates into the ground and recharges a 5,000 sq middot m. aquifer underlying the watershed. There is no other inflows or outflows into or out of the aquifer. There is a river flowing through the watershed with inflow rate of 5 m^3/s which discharges into a reservoir at watershed outlet. The annual water storage in the reservoir increases by 2.5 times 10^6 m^3. In a certain year, a farmer drills a well into the aquifer for irrigation purposes. a) If 40% of irrigation water goes to evapotranspiration and 15% infiltrates and recharges the aquifer, how much water does the farmer pump without depleting the storage of the aquifer? b) What is the annual flow of the river (m^3/s) at the watershed outlet?