1 cubic foot = 7.48051948 US gallons
radius (r) = d/2 = 4/2 = 2
Volume of a cylinder = Pi*r2*h
V = Pi*22*4 ~= 50.2654824 cubic feet * 7.48051948 gallons/cubic foot ~= 376.01 gallons
4 gallons.
29,610.94 gallons (rounded)
4745 gallons Best estimate I have.
A cylindrical tower with a diameter of 10 feet and a height of 30 feet has a volume of: 2,360 cubic feet.
217147
3.14x4=12.56x2=25.12cubic feet 1 cubic ft=7.48 gals 7.48x25.12=187.8976gals
An 18-inch pipe (inside diameter) 3,000 feet long could hold up to 5,301.44 US gallons.
Pipe is generally cylindrical and the dimension refers to the inside diameter. One cubic foot contains 7.48 gallons. The volume of a one foot long 20" diameter pipe is: pi(1.667/2)^2 = 2.18 cubic feet. At 7.48 gallons per cubic foot the total volume is 16.3 gallons.
=== ===
a 4 feet diameter tank holds 94 gallons/foot. Therefore 94 x 3 =282 gallons
There will be about 5757 US gallons in a full tank of this size. A cylinder's volume is the area of the base times its height. The area of the base is pi times the square of the radius of that base. A radius is half a diameter. Half of 7 feet is 3 1/2 feet. If we take pi times the square of that, we'll get about 38.48 square feet. Multiply that by the 20 foot length and you'll get about 769.6 cubic feet. There are about 7.5 gallons in a cubic foot of water. Multiply the 769.6 feet3 (the volume) by 7.5 gallons/foot3 and there's the (approximately) 5757 gallons (US) in that tank.
I am on my sixth beer so I don't know if you talking about a 16 foot perimeter or a 16 food diameter... if its a 16 foot diameter then 22773.83 gallons... That's to the very top. if its a 16 foot perimeter which would be totally illogical but oh well, it would be 2306.69 gallons... that means the diameter would of your pool would only be 5.1ish feet.
There are 907.9202769 feet2 of water, but you will have to convert that into gallons.