A sedimentation basin is 90 feet long, 30 feet wide, and 12 feet deep. What is the surface area of the tank in square feet?

To determine the surface area of the sedimentation basin, it is important to understand that the surface area refers to the measurement of the area of the top surface of the basin itself. For a rectangular basin, the surface area can be calculated using the formula for the area of a rectangle, which is length multiplied by width.

In this case, the length of the basin is 90 feet and the width is 30 feet. By applying the formula:

Surface Area = Length × Width

The calculation would be:

Surface Area = 90 feet × 30 feet = 2700 square feet.

This indicates that the top surface area of the tank is indeed 2700 square feet, confirming that this is the correct measurement for the surface area of the sedimentation basin.