An ST-III sediment trap requires how many cubic feet of storage per acre of drainage area?

The ST-III sediment trap is specifically designed for managing sediment in various construction and land development scenarios. In Maryland, the design criteria for these traps state that they need to provide adequate storage capacity to effectively manage sediment loads from the drainage area.

The correct storage requirement is 5,400 cubic feet of storage per acre of drainage area. This amount is crucial because it ensures that the sediment trap can handle the volume of sediment that is likely to accumulate during rainfall events and that it can provide enough capacity to prevent sediment overflow and ensure effective sediment control.

This storage capacity is based on factors like expected runoff, sediment load, and the physical characteristics of the site. By adhering to this requirement, practitioners can help minimize erosion and sedimentation impacts downstream, promoting better environmental outcomes in compliance with state guidelines.