Hi All,
We're on acerage here and have town water, plus two rainwater tanks. 23,000 and 6,000 litres.
I have made some rough measurements: 10mm of rain puts 2,300 litres of water in the big one and 750 Ltrs. in the smaller tank.
The smaller tank collects off the shed. Not all of the water off the house flows into the large tank. Approx. 40% goes to a gravel pit.
Six taps connected to a pump provides water distribution on the two acres.
40 fruit trees do quite well on the supply. Ranging from nuts to mangoes, we have something in harvest all year round.
When you look at the figures 1 mm of rain is 1 Ltr over 1 sq mtr. The first mm needs to wet the surface before runoff is collected.
Hi Trevor,
A house 20x15 mtrs has a roof area of 300 sqmtrs. That means about 300 Ltrs per mm of rain once runoff starts. One decent shower of 6-10 mm would fill your tank.
Cheers Marty