Probably 15,300 gallons. 20 x 40 = 800 sq ft x 5 = 4000 cu ft. I just re filled my 20 X 40 pool and it has a deep end of 8 !/2 feet. plus sides that slope towards the "square" in the center of the deep end.I don't think that matters ,though. When the water started coming into the shallow end at that point I had put in 10,200 gallons.Based on the walls being 3 1/2 feet high I calculated I had already put 5 ft of water in the pool. I used a hydrant meter to measure the water. So this is what I am basing my calculations on
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box = 18 x 36 x 3 = 1944 cu ft wedge = 1/2 x 5 x 36 x 18 = 1620 cu ft total = 3564 cu ft = 26661 us gal
twelve
My foot is actually about 1 foot long!
A square foot equals an area 12"Wide x 12"Long x 1"Deep. A cubic foot equals an area 12"W x 12"L x 12"D. Therefore, a cubic foot contains 12 square feet. A cubic foot contains 7.48 gallons of water (trust me). You divide a cubic foot by 12 to get 12 square feet, therefore you would divide 7.48 by 12 to get the amount of water contained in 1 square foot. 7.48 divided by 12 equals .623 gallons. For every inch of rainfall there will be .623 gallons of water falling on every square foot.
12 inches = 1 foot