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Learned about this site the other day (on TSP,) thought it was cute enough to pass along -- http://www.save-the-rain.com.
It reports in metric, but you can do the math pretty easily. You feed it your address and it brings up a google-maps satellite view. You zoom in and draw an outline around your roof and it takes that and rainfall for your area and tells you how much rain you could harvest in a year. Wish it reported by month, since the Dec-Jan rainfall doesn't help my garden much, but free is a good price.
MrB+
It reports in metric, but you can do the math pretty easily. You feed it your address and it brings up a google-maps satellite view. You zoom in and draw an outline around your roof and it takes that and rainfall for your area and tells you how much rain you could harvest in a year. Wish it reported by month, since the Dec-Jan rainfall doesn't help my garden much, but free is a good price.
MrB+