



 
Hi Jeff, One acre is 43560 square feet so the volume of water is 43560 1 = 43560 cubic feet. One US gallon is 231 cubic inches which is 231/(12 12 12) = 0.13368 cubic feet. Since you can pump at 1000 gallons per minute that is 133.68 cubic feet per minute. Hence to pump 43560 cubic feet will take
Since there are 60 minutes in an hour that is
Penny Jeff, Here's how I would work this out. First remember that time = volume / pumprate. Note that I used UK gallons here. If you are using US gallons, you need to use 7.480519 instead of 6.228835 because US gallons are smaller than UK gallons. Stephen La Rocque.>
 


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