RE: [GBlist] residential rainwater harvesting

[Brenda Norman <bnorman@ceiarchitecture.com>]

math error:
1250 sf  = 180,000 sq.in. (1250x12x12)
180,000 / 231 = ~780 gallons
-----Original Message-----
From:	Gilbert Midonnet [SMTP:gilbert.midonnet@btec.com]
Sent:	Wednesday, May 29, 2002 10:16 AM
To:	'GrenSheltr@aol.com'; greenbuilding@crest.org
Subject:	RE: [GBlist] residential rainwater harvesting

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.er.doe.gov/epic/HTML/indices.PDF> 
http://www.gsu.edu/~oprdeb/measure/anglo-amer.html
<http://www.gsu.edu/~oprdeb/measure/anglo-amer.html>  
http://www.fourmilab.ch/hackdiet/www/subsection1_4_2_0_1.html
<http://www.fourmilab.ch/hackdiet/www/subsection1_4_2_0_1.html> 
http://www.speckdesign.com/Tvolume.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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