What is the purpose of diversion dikes and berms in erosion control?

Diversion dikes and berms are specifically designed to redirect water away from areas that are prone to erosion. Their primary role is to manage the flow of water, especially during storms or heavy rainfall, ensuring that clean water runoff does not travel over disturbed soil that could lead to erosion and sedimentation issues. By directing this clean runoff away from vulnerable areas, diversion dikes and berms help protect the soil structure and maintain the integrity of the erosion control measures in place.

This function is crucial in controlling the quality of water that enters nearby water bodies, as it minimizes the risk of sediment-laden water being generated. It also reduces the potential for soil loss and degradation in construction sites or other areas where the ground may have been disturbed, leading to increased erosion potential. In summary, the use of diversion dikes and berms is a preventive measure aimed at controlling water flow to mitigate erosion risks effectively.