Which of the following is NOT a runoff control method?

• A. Rolled erosion control products
• B. Diversions
• C. Check dams
• D. Slope drains

Answer: (A)

Rolled erosion control products are primarily designed to help establish vegetation and stabilize soil surfaces in order to prevent erosion rather than specifically controlling runoff. These products are typically used to cover bare soil areas, facilitating the growth of plants that can absorb rainfall and reduce the speed at which water moves across the surface, thereby minimizing erosion.

In contrast, the other options are methods specifically intended for controlling runoff. Diversions help redirect surface water flow away from vulnerable areas. Check dams are installed in channels to slow down water flow and allow sediment to settle out before it can be carried away. Slope drains are used to manage water from slopes, directing it safely down the slope and preventing erosion and runoff issues.

Understanding the distinct purpose of each method clarifies why rolled erosion control products do not function in the same capacity as the other listed options in managing runoff.