A pump of 80% efficiency lifts water from one large open tank to another; the difference in water surface elevations is 20 feet. The pipe is relatively smooth (f = 0.0122), and has 3 elbows, each with a loss coefficient of 2/3. The pipe is 4-inches in diameter and 40 feet long. The kinematic viscosity of water is 10-5 ft2/sec. What horsepower must be supplied to the pump in order to convey 2 CFS through the system?