here is the basic formula to figure how much pumping you need to do. It takes aprox 25,000 gallons of water to cover one acre of land with 1 inch of water. So 40 acres would take 1 million gallons of water to be 1 inch deep. Six inches deep would be around 6 million gallons of water. Find out how much water your pump will pump in one hour and you can calculate the number of days it will take. PM me if you need me to calculate it
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