Page:Handbook of Meteorology.djvu/291

 {|cellpadding="7" cellspacing="0" style="margin:3em auto;" rainfall per acre per acre rainfall per acre per acre The U S or Queen Anne gallon used in the foregoing table contains 231 cu in or 0.1368 cu ft. The Imperial or British gallon contains 277.3 cu in. To reduce U S to Imperial gallons multiply by 0.83⅓.
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To find the quantity of rainfall per square mile, multiply the quantity per acre by 640.

One inch of rain per acre is at the rate of 113 tons per acre or 7320 tons per sq mi.

One pound equals 0.5507 in.