RE: [GBlist] residential rainwater harvesting

[Gilbert Midonnet <gilbert.midonnet@btec.com>]

ok, being my usual geeky self, I wanted to review the calculation below. 720 gallons seemed high to me.

 

There are 231 cubic inches to the gallon; 7.48 gallons per cubic foot

 

1250 square feet = 15,000 square inches.

 

One inch of rain equals 15,000 cubic inches.

 

15000/231=64.9 gallons

 

or, another way,

 

there are 1728 cubic inches in a cubic foot (12x12x12)

15000/1728=8.68

8.68x7.48=64.9

 

-- glm

 

 

http://www.er.doe.gov/epic/HTML/indices.PDF

http://www.gsu.edu/~oprdeb/measure/anglo-amer.html 

http://www.fourmilab.ch/hackdiet/www/subsection1_4_2_0_1.html

http://www.speckdesign.com/Tvolume.html

-----Original Message-----
From: GrenSheltr@aol.com [mailto:GrenSheltr@aol.com]
Sent: Wednesday, May 29, 2002 7:54 AM
To: greenbuilding@crest.org
Subject: Re: [GBlist] residential rainwater harvesting

someone I met here whose house was also on eco-friendly house tour indicates his roof on1250 sq ft house generates some 720 gallons of water for every 1" of rain - was an amazing number for me    Linda Lloyd

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