Which action best describes how to perform an outfall inspection?

• A. Visually observe flow and note discharge characteristics.
• B. Measure water chemistry parameters extensively.
• C. Replace the BMP on site.
• D. Close the outfall.

Answer: (A)

Focus on what you can observe right at the discharge point. The best way to perform an outfall inspection is to visually observe whether there is flow and to note the discharge characteristics such as color, turbidity, odor, sheen, and any visible debris. This quick, direct observation lets you confirm that the outfall is active during a storm event and quickly spot obvious problems like unusual discharges or signs of improper BMP operation. It’s efficient, noninvasive, and provides the information you need to decide if further steps are needed.

Extensive water chemistry testing isn’t typically part of a routine inspection; it requires sampling, equipment, and lab analysis and is used only when there are specific concerns. Replacing the BMP or closing the outfall are corrective or emergency actions, not inspection steps, and would come after you’ve identified an issue during the inspection.