A pump storage facility takes water from a river at night when
demand is low and pumps it to a hilltop reservoir 500 ft above the
river. The water is returned through turbines in the daytime to
help meet peak demand. (a) For a single 30-inch pipe, 2,500 ft long
and carrying 20,000 gaVmin, what pumping power is needed if the
pump efficiency is 85 percent? The friction loss is estimated to be
15 ft of water. (b) How much...