Rainwater tanks are a popular alternative source of water to town supply. They are being used to supplement reticulated water supply in households and other facilities. The usefulness of a rainwater tank is dependent on the amount of rainfall in the region, the collection area (usually the roof ), the size of the tank and the demand.
In a sports club, non-potable water use such as toilet and urinal flushes or irrigation can account for a significant part of its water demand - in some cases it can be as high as 50% of the club’s water use. This increases with the size of playing fields or greens used by a club. Therefore, rainwater capture can play an important role in addressing non-potable water use at a sports club; it not only eases the pressure on the country’s water system, but can also reduce a club’s running cost in areas where water rates and waste water rates are high.
The following figures for water storage tanks are calculated by BRANZ, based on average NZ rainfall and a 140 m2 roof space.
A 1,000 litre tank provides between 63,000 - 93,000 litres annually, good for garden-only purposes.
A 5,000 litre tank provides between 76,000 - 120,000 litres annually, good for laundry and toilet-only purposes.
A 23,000 litre tank provides between 83,000 - 134,000 litres annually, good for laundry, toilet, and garden purposes.