Which of the following measures volume in water treatment?

The measure that accurately reflects volume in water treatment is cubic feet. This unit is commonly used to express the capacity of tanks, pipes, and other containers within water treatment facilities. Volume measurement is essential for determining how much water a system can handle, the amount of chemicals needed for treatment, and the overall operational capacity of the facility.

Cubic feet provides a clear indication of three-dimensional space occupied by water, making it a standard metric in engineering and design processes associated with wastewater treatment. In contrast, the other options relate to different parameters: pounds per gallon focuses on weight rather than volume, horsepower measures power output, and watts quantify electrical energy. Each of these units plays an important role in various aspects of water treatment, but only cubic feet serves as a direct measurement of volume.