SIERRA RAINWATER HARVESTING<br /><br />
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How much rain can I collect?
The general rule of thumb for calculating the amount of rainfall you can collect is based on the following formula...

1" of rain x 1 sf = .623 gallons of rainwater

Or use this formula

1" of rain per 1000 sf = 623 gallons of rainwater


There are approximately 90k drops of water in a gallon of water. 

One faucet leaking a drop a second will loose almost 1 gallon of water a day.

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