What is the volume of a settling tank measuring 100 ft. long, 25 ft. wide, and 8 ft. deep?

To determine the volume of a settling tank, you can use the formula for the volume of a rectangular prism, which is calculated by multiplying the length, width, and depth of the tank.

In this instance, the settling tank measures:

• Length: 100 ft

• Width: 25 ft

• Depth: 8 ft

The volume calculation would be:

Volume = Length × Width × Depth

Volume = 100 ft × 25 ft × 8 ft

Volume = 20,000 ft³

Thus, the correct choice, representing the volume of the settling tank, is indeed 20,000 ft³. This value reflects the total space within the tank available for sedimentation processes to occur, making it essential for ensuring proper water treatment in surface water systems.