RAINWATER CALCULATOR

Rainwater tanks fill 3 times a year on average. To calculate the best tank size to purchase, divide the annual harvest potential in litres by 3 and round the number up to the nearest appropriate tank size.

 

We recommend rounding up to the nearest 100 if this number is under 1000 and to the nearest 500 if above.

 

i.e. if you average rainwater harvest potential is 12,500 litres, dividing this by 3 gives approx 4166 litres (assuming a tank fills 3 times a year)

 

Hence, this will require a minimum 4500 litre tank.