What is one essential requirement when constructing a temporary slope drain?

The requirement for a diversion or earthen dike to direct water into a temporary slope drain is crucial because it ensures that runoff is effectively channeled into the drain system. This minimizes the potential for erosion by controlling where water flows and preventing it from creating unintended pathways that could lead to additional sedimentation and destabilization of surrounding areas.

By directing water into the slope drain, the design helps manage stormwater runoff and reduces the likelihood of excess water cascading down the slope, which can exacerbate erosion. This practice not only aids in protecting the soil but also helps in maintaining the integrity of construction sites by keeping water concentrated in designated areas that can be easily managed, particularly during rain events.

The other options, while they may have some merit in different contexts, do not address the primary function of a temporary slope drain as comprehensively as the requirement for a diversion or earthen dike.