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permaculture - Calcultations for rain water catchment

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  • From: "Steve Diver" <steved@ncatark.uark.edu>
  • To: permaculture@listserv.oit.unc.edu
  • Subject: Calcultations for rain water catchment
  • Date: Mon, 20 Oct 1997 16:00:29 +0000

Some useful figures and calculations for rain water catchment:

1st
Inches rainfall x Square feet of surface area = Amount

2nd
Amount x 0.625 Factor

Factor = (12-inch depth per cubic foot and 7.5 gallons per cubic
foot of water) or (7.5 divided by 12 = 0.625)

Example:

30-inches per year is equivalent to 18.75 gallons per of water
collected from each square foot of surface area.

30-inches of rainfall collected from the roof of a 1,600 square
foot home = 30,000 gallons water

30-inches of rainfall collected from the roof of a 2,500 square
foot home = 46,875 gallons water

Storage tank capacity will depend on total rainfall, surface area
collected, seasonal rainfall patterns, and seasonal water use patterns.

If ya'll got any other handy calculations and figures, please
share them.

Steve Diver


--
steved@ncatark.uark.edu




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