For water supply to a town, water is pumped from the river 3km away into a reservoir. The maximum difference of levels of water in the river and the reservoir is 20m. The population of the town is 50000 and the average per capita water demand is 120 /d. If the pumps are to operate for a total of 8 hours and the efficiency of pumps is 80%, determine the horsepower of the pumps. Assume f = 0.03, the velocity of flow as 2 m/s and maximum daily demand as 1.5 times the average daily demand. Commercially available pipe diameters are: 300, 400, 450 and 500 mm.

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