The helms pumped storage hydroelectric plant is located 50 miles east of fresno california in the sierra nevada mountain range. the facility consists of an upper reservoir known as the courtright reservoir with a storage capacity of 123000 acre ft. the wishon reservoir serves as the lower reservoir and has a storage of 129000 acre ft.. the plant features 3 reversible pump/turbine machines rated at 350mw each and the average head is known lo be 1625 ft. determine the amount of water contained in the upper reservoir in gallons. determine the potential energy of the reservoir in joules. given the efficiency of the penstock is 95%, determine the velocity of the water in the penstock.