For a purification plant serves 400000 capita with average rate of water consumption 250 lit/cap/day and filters operate with rate of filtration It is required to determine:- <150 m/day
a. numbers and dimensions of rapid sand filters,
b. capacity of the backwash storage tank that hold sufficient water for two consecutive 15 minutes washes at a velocity of 0.5 m/min., and
c. numbers and dimensions of ground storage tanks