in a pumping station 18000m3 water to be raised per day from an intake well to a sedimentation tank under the static head of 21m. Lengths of suction pipe and raising main are 40m and 150m respectively. Diameter of pipes is 50cm. There are two shifts of working of pumps each of 8 hours. Coefficient of friction is 0.04 and combined efficiency of motor pump is 80%.