What characteristic defines a designed waterway for stormwater management?

A designed waterway for stormwater management is characterized by an erosion-resistant lining, which is crucial for maintaining the integrity and functionality of the channel over time. This lining helps prevent soil erosion along the banks and bottom of the waterway, ensuring that stormwater can be efficiently transported without degrading the waterway or surrounding environment.

Erosion can significantly alter the design and effectiveness of a waterway, potentially leading to sediment build-up, increased flooding risk, and a negative impact on water quality. By incorporating erosion-resistant materials, such as concrete, riprap, or geotextiles, these designed waterways can better withstand the forces of turbulent water flow during storm events.

Other options, while potentially related to waterway characteristics, do not specifically define a designed waterway intended for stormwater management. Temporary use would refer to a short-term solution rather than a permanent infrastructure, natural formation would imply an existing feature rather than a constructed one, and seasonal variable capacity addresses the ability to handle different flow volumes but does not directly relate to the construction and durability of the waterway itself.