Texas Class D Water License Practice Exam

When calculating the volume of a vertical cylinder, the critical measurements needed are the area of the base and the depth (or height) of the cylinder. The formula for the volume of a cylinder is given by V = A × h, where V is the volume, A is the area of the base, and h is the height or depth of the cylinder.

The area can be determined from the shape of the base (typically circular), and the depth defines how tall the cylinder is. Both these measurements directly affect the calculation of volume.

In contrast, weight and pumping level do not play a direct role in determining the cylinder's volume. Although weight might be relevant in other contexts, such as calculating the load or pressure exerted by a substance within the cylinder, it is not a necessary measurement for volume calculations. Pumping level could relate to the operation of a system or the efficiency of a pump, but it does not contribute to the geometric calculation of volume itself. Thus, the measurement that is not necessary when calculating the volume of a vertical cylinder is weight.