What is the function of a diversion channel in drainage systems?

The function of a diversion channel in drainage systems is to redirect water flow to prevent flooding. These channels are specifically designed to manage and guide the movement of excess water away from areas that are at risk of flooding, such as developed urban environments or low-lying regions. By effectively directing the flow of water, diversion channels protect structures, infrastructure, and natural ecosystems from water damage, erosion, and other flooding-related hazards.

While other options might contribute to water management or landscape design in various contexts, they do not accurately represent the primary purpose of diversion channels. For instance, they do not serve primarily as storage facilities for later use or as elements for aesthetic landscaping enhancements. Additionally, while filtration and cleaning are important in water management, the specific role of a diversion channel is focused on the control and rerouting of water flow, making it essential for flood prevention.