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Re: E-M:/ Water challenge



1 gallon = 231 cu inches and a little math will get you to 7.48 gal per cu ft.  For porus soils the empty space between gravel/sand pieces may be as much as 50%  So at 43560 sq ft per acre, one foot deep there would be 43560 cubic ft of which 1/2 would be potentially water or a grand total of as much as 325,829 gallons. 
 
For various purposes, hydrologists sometimes refer to an acre foot of water.  Our lake is approx 200 acres and the top foot of it would be over 65 million gallons.
Regards,
Chuck