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Hi
Shiva, You can divide your basement into two rectangle, A and B, one 40 ft by 28 feet and the other 16 feet by 22 ft. The watre is 16 inches deep so and you can use our volume calculator to calculate the amount of water in the basement.
For a total of 14681.9 gallons. At 50 gallons per minute it will take 294 minutes which is about 5 hours and hence with 2 pumps about 2.5 hours. I hope this helps, Shiva, Steve looked at my response and suggested that I mention that the last couple of inches will probably not pump out at full speed because of the water shape/air gulping. Harley  


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