Which temporary control measures can be designed as needed in runoff management?

Temporary swales and check dams are specifically designed to manage runoff during construction or other temporary disruptions to the landscape. These measures are flexible and can be adapted to suit the specific conditions of the site, such as slopes, soil types, and the volume of runoff expected.

Temporary swales are shallow, grassy channels that can direct runoff and promote infiltration, which helps to reduce erosion and sediment transport. Check dams, on the other hand, are small barriers built across swales or channels to slow down the flow of water, allowing sediment to settle out and preventing it from being carried downstream.

In contrast, permanent drainage systems are built for long-term use and are not designed to be temporary. Only silt fences provide a specific function related to sediment control but do not encompass a broader range of runoff management options, and grassed waterways are also generally permanent features intended for long-term sediment transport and erosion control, rather than being temporary measures.

This is why temporary swales and check dams are the appropriate choice for temporary control measures in runoff management.