A water supply system consisting of two pipes supplies a hospital with water at a normal pressure of 28 m.w.c. The hospital is located between the reservoir and the storage tank. The supply reservoir may be assumed to be at zero elevation, the storage tank at an elevation of 30 m, and the hospital at an elevation of 15 m. The discharge pressure of the reservoir is 53 m.w.c. The height of the water in the storage tank is maintained at 30 m above ground level. The piping installed between the reservoir and the hospital consists of a 760 m long cast iron pipe of 250 mm diameter. The piping between the storage tank and the hospital consists of a 1200 m long cast iron pipe of 200 mm diameter. For cast-iron pipes, use C = 140 for the pipe

1. Calculate the hydraulic head at the storage tank, reservoir, and the hospital.
2. Determine the flow available for the hospital from the reservoir and the storage tank.
3. Determine the power demand in kilowatts for this operation if the overall efficiency of the reservoir pump and the motor is 75%.