1 cubic foot of water equals 7.5 gallons. Your tank holds 64ft x 64ft x 16ft of water, or 65,536 cubic feet. 65,536 cuft x 7.5 gallons = 491,520 gallons.
My guess would be 7.48 gallons since that is how many gallons of water is in a cubic foot
I'm assuming water -- then you would have 748.05 gallons of water in 100 cubic foot volume.
One cubic foot of water is 7.4805 gallons.
My answer would be 18.75 gallons
There are 7.48052 US gallons per cubic foot.
7.518 gallons.
That's 27 cf of water. And, at 7.48 gal/cf, that gives you... 201.96 gallons, or 202 gallons rounded...
1 cubic foot of water is 7.48052 US gallons.
One cubic foot of water is about 7.48 (7.48052) US gallons.
141.06 gallons
In a 17 foot by 13 foot pool each foot of depth would contain 1653.08 gallons of water. If the pool had a average depth of 4 feet there would be 4 X 1653.08 or 6612.32 gallons.
One acre-foot is about 325,851 US gallons.