What is the required minimum storage capacity for sediment basins controlling drainage areas of 3 acres or more?

The required minimum storage capacity for sediment basins controlling drainage areas of 3 acres or more is 134 cubic yards per acre. This specification is in alignment with guidelines designed to ensure that sediment basins effectively capture and manage sediment from runoff, especially in larger drainage areas where there is a higher potential for sediment transport. By requiring this specific storage capacity, the regulation aims to safeguard water quality by preventing excessive sedimentation in downstream water bodies.

The 134 cubic yards per acre requirement also allows for an adequate volume to address varying storm events, thus ensuring that the sediment basins function correctly and efficiently under different weather conditions. This volume is calculated based on factors such as sediment load, basin efficiency, and the need to accommodate the volume of runoff, thus promoting effective erosion and sediment control practices in Virginia.