What is an "overflow structure" in stormwater systems?

An overflow structure in stormwater systems is designed specifically to manage excess water. It serves a critical function by allowing additional flow to exit the primary stormwater management system when the capacity of that system is exceeded. This is important for preventing flooding and controlling water levels during heavy rainfall events. By directing excess water away, overflow structures help protect infrastructure and minimize erosion, while also ensuring that the remaining water management systems can operate effectively without being overwhelmed.

This functionality is essential to maintaining the balance and safety of stormwater management systems, especially in areas prone to heavy rains or rapid snowmelt. The other choices do not capture this key role; measuring rainfall is important for understanding water inputs, water quality filters focus on treatment rather than flow management, and aesthetic features have no operational purpose in stormwater flow management.