What is the purpose of using temporary or permanent channel structures during concentrated runoff?

Using temporary or permanent channel structures during concentrated runoff is primarily intended to safely conduct runoff without causing erosion. These structures are designed to manage the flow of water, especially in areas prone to high runoff due to precipitation or land disturbances. By directing the water through these engineered channels, the velocity of the runoff can be controlled, reducing the potential for erosive forces that could damage the surrounding land or infrastructure.

The design of these channel structures typically incorporates features that stabilize the soil and prevent erosion, such as vegetation, riprap, or other materials that can absorb or slow down the water flow. This is crucial in preventing sediment from being washed away into nearby water bodies, which can lead to pollution and degradation of aquatic ecosystems.

In contrast, increasing erosion or diverting water away from the site can lead to negative impacts on both the environment and construction sites, causing additional issues such as sedimentation and poor water quality. While enhancing landscape aesthetics may be a side benefit of properly designed channel structures, the primary focus is on erosion control and managing concentrated runoff effectively.