Rainfall
in
Inches
 
1,000 2,000 3,000 4,000 5,000 10,000
 
1 625 1,250 1,875 2,500 3,125 6,250
2 1,250 2,500 3,750 5,000 6,250 12,500
5 3,125 6,250 9,375 12,500 15,625 31,500
10 6,250 12,500 18,750 25,000 31,250 62,500
30 18,750 37,500 56,250 75,000 93,750 187,500
40 25,000 50,000 75,000 100,000 125,000 250,000
50** 31,250 62,500 93,750 125,000 156,250 312,500
60 37,500 75,000 112,500 150,000 187,500 375,000
  *Gallons of Water Captured
 
The above Chart gives Approximate Number of Gallons collected over a year for Residential or Commercial Applications.
 
* Annual Rainfall(Per Inch) x 625 Gallons Per 1,000 Sq Ft Roof Surface.
 
** Average Rainfall Per Year for Atlanta GA
 
*** Actual Yield is + - 10% due to evaporation and splash.
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