Answer
$3000\pi \ m^3\approx 9420~m^3$
Work Step by Step
Since the diameter of the cylinder is $20.0 m$, then the radius is $r=10.0 m$. Now, the volume is given by
$$
V=\pi r^2 h=(10^2 )(30) \pi=3000\pi \ m^3\approx 9420~m^3
.$$
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