Explanation: Given Data: Village population = 200 The average rate of water demand = 100 litres per capita per day average filtration rate = 100 liter/hour/m2 = 100 x 24 liter/day/m2 Ratio of maximum demand to average demand = 1.5 Design dicharge = 1.5 × Village population x average rate of water demand= 1.5 x 200 × 100 = 30000 liter/day/m2 Area of rapid sand filter=