What is the maximum allowable slope for a Type A temporary swale?

The maximum allowable slope for a Type A temporary swale is indeed 10 percent. This standard is established to ensure proper function and effectiveness of the swale in managing water runoff and erosion control. The moderate slope allows for adequate flow without causing excessive water velocity, which could lead to erosion of the swale itself or surrounding areas.

A slope of 10 percent strikes a balance between ensuring effective drainage and reducing the risk of erosion. If the slope were to exceed this percentage, the increased water velocity could compromise the swale’s ability to temporarily hold and manage runoff safely. Therefore, adhering to the 10 percent maximum is crucial for maintaining the performance and integrity of Type A temporary swales in erosion and sediment control practices.