Which Size Septic Tank?

How do you compute the dimensions of a septic tank? C = 2000 liters + 180 × 4 = 2900 liters, For 4 users, the minimum size of a septic tank could be 2.2m × 1.0m × 1.30m (7.2ft × 3.3ft × 4.25ft). There should be 1 to 1.5ft of free space above the water…