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How much can I collect?
A one-inch rain on 1000 square feet of collection surface will yield about 550 real world gallons of rainwater.

How much collection surface (roof) do I need?
Figure on at least 1500 square feet minimum for two people here in the Hill Country with our average rainfall of 32 inches a year.

How much do I need to store? 
Allow about 5000 gallons storage capacity for every family member.  This will get you through the worst of droughts.

How much does it cost?
A very, very ballpark figure is $15,000 for a 10,000-gallon whole-house system including storage tank, prefiltration, pump, secondary filtration and disinfection.

What are the recurring costs?
Replacing the UV bulb every 14 months ($75), replacing sediment filter every 30 days ($3.50) and replacing the activated carbon filter every 90 days. ($10)

What's the most important thing to remember when designing my system?
The inlet on your collection tank has to be lower than the lowest downspout on your collection surface.  When siting your tank, you also need to keep in mind the considerable weight of water--more than eight pounds per gallon.  This means that a 10,000-gallon tank that's full of beautiful rainwater weighs 80,000 pounds.  You want this big monster sitting somewhere flat, smooth, and, ideally, a little soft...

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