Which action focuses on stopping spills from migrating by controlling flow at the source?

• A. Containment barriers (booms/dikes)
• B. Absorbents
• C. Proper drainage control
• D. Preventing runoff at the source

Answer: (C)

The idea is to stop a spill from moving by shaping and controlling the water flow at its origin. Proper drainage control works by designing and maintaining the way water drains in the area—routing runoff away from the spill, directing it to safe collection or treatment, and closing or redirecting channels that could carry contaminants off-site. By controlling where the water goes, you prevent the spilled material from migrating in the first place.

Absorbents and containment barriers are reactive measures used after a spill has occurred: absorbents soak up material, but they don’t stop water from moving; barriers like booms and dikes trap or slow a spill that’s already in motion. Preventing runoff at the source is related, but drainage control encompasses the broader system of pathways and infrastructure that keep surface water from carrying contaminants away, which is why it’s the most effective answer here.