7. Pumped hydroelectric storage is an effective way to store energy until it is needed. Off-peak electricity is used to move water via electric pumps from a low pool to an elevated reservoir.Then, when the electricity is needed during peak times, the water is released, which turns a turbine and generates electricity. There is a pumped-storage reservoir that is shaped like a long rectangular pool with a surfacearea of 1 acre. Once the water is released, it falls out of the bottom of the reservoir and flowsover a waterfall that is 50 meters in height. How deep must the reservoir be to operate a 40 MWhydro-turbine for 6.0 hours each day? Assume that this hydro facility is 100 percent efficient.Note: 1 acre = 4046.9m².