It can be any "height" greater than zero.
There are three dimensions to a volume and as the volume increases in one of them, it can decrease in another. Also, volumes have no specific shape.
Assuming a cuboid, 3 cu ft could be in length × width × height:
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5*3=15 15*2=30 30 cubic feet
The question is ambiguous. Do you mean how many cubic feet are in a sphere with radius of 30 feet?
6,084*pi cubic feet or about 21,364.56 cubic feet.
30 feet by 30 feet by 4 inches = 300 cubic feet
10,800 cubic feet