



 
Alexandra, You need to know the total square footage of the surface of the three tanks. The evaporation rate is 1 gallon per hour for each square foot of surface area. There are 24 hours in a day so that's 24 gallons per square foot each day. If the correct amount is approximately 50,000 gallons in one day then the total surface area is 50,000/24 or a little more than 2,000 square feet. Penny  


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