What is the main purpose of providing outlet protection for newly constructed stormwater conveyance channels?

The primary purpose of providing outlet protection for newly constructed stormwater conveyance channels is to prevent scour and minimize downstream erosion. This is crucial because when stormwater exits a channel at high velocities, it can cause soil erosion at the outlet point. Over time, this erosion can lead to significant damage in the surrounding environment, including destabilization of banks, sedimentation in water bodies, and deterioration of aquatic habitats. By implementing outlet protection measures such as riprap, concrete aprons, or other erosion control materials, the energy of the discharge is dissipated, which greatly reduces the potential for scour and protects the integrity of the downstream area. This proactive approach not only helps safeguard human-made structures but also preserves natural ecosystems, highlighting the importance of erosion and sediment control techniques in stormwater management.