Which trap requires 5,400 cubic feet of storage per acre?

The Riprap Outlet Trap (ST-III) is designed specifically to meet the high volume requirements for sediment storage, which is why it requires 5,400 cubic feet of storage per acre. This substantial capacity is necessary to effectively capture and retain sediment in areas where water runoff can lead to significant erosion and sediment transport.

The design utilizes riprap as part of the outlet structure, which aids in dissipating energy from runoff and prevents erosion at the outlet's discharge point. This method is particularly effective in dealing with the larger volumes of water and sediment that can occur during heavy rainfall events.

In the context of Erosion and Sediment Control, understanding the storage requirements of various sediment traps is crucial for effective site management and compliance with regulatory standards. The requirement of 5,400 cubic feet is indicative of the significant role that the Riprap Outlet Trap plays in maintaining water quality and minimizing sediment transport in disturbed areas.