CALCULATION OF WATER TANK CAPACITY Number of person – 5 nos Number of liters (Aprox) - 175 liters/day/no Number of years - 3days, Capacity of tank = 3 x 5 x 175 = 2625 liters =2.6 cubic meter Depths of tank = 1.21 m Size of the tank = 2.16 square meter = 1.47 x 1.47 Free board = 0.3m Size of the Tank = 1.5(L) x 1.5 (B) x 1.5 (D)