Which of the following is NOT a component of a typical rectangular sedimentation basin?

A typical rectangular sedimentation basin is designed primarily to allow particles and solids suspended in water to settle out by gravity. The essential components of such a basin include baffling systems, which help to distribute flow evenly and minimize turbulence, adjustable weirs for controlling water level and flow rate, and sludge pumps for removing settled solids from the basin.

The absence of a filtration system from this list is what makes it the correct choice. Filtration systems are usually distinct components used for further treating water, typically after sedimentation has occurred. They are employed to remove any remaining particulate matter and improve water clarity but are not integral to the sedimentation process itself. Therefore, in a typical sedimentation basin setup, a filtration system would not be included as a direct component.