A diversion earthen dike is used to direct what into a temporary slope drain?

A diversion earthen dike is designed to manage surface water, particularly stormwater, by directing it into a temporary slope drain. Stormwater, which results from precipitation events such as rain or melting snow, can lead to erosion and sedimentation issues if not properly managed. The primary function of the dike is to intercept the flow of stormwater and direct it away from vulnerable areas or directly to drainage systems that can handle it effectively, thereby minimizing the potential for erosion and sediment transport.

While rainwater runoff is a component of stormwater, the term "stormwater" encompasses any water that runs off during a rain event, including that which might come from developed surfaces, parking lots, or other impervious areas. Groundwater and contaminated water are not the direct focus of a diversion dike's purpose in this context, as the primary goal is managing surface runoff generated during rain events.