What is the primary purpose of storm drain inlet protection?

The primary purpose of storm drain inlet protection is to pond water and allow sediment to settle out. This practice helps to reduce the amount of sediment and other pollutants that enter the storm drainage system. By implementing this measure, stormwater runoff is temporarily held back, giving sediments—such as soil, debris, and other particulates—time to settle before the water continues to flow into the storm drains. This is crucial for maintaining water quality, as sediment can carry various pollutants that can harm aquatic ecosystems and water sources.

While enhancing drainage system capacity, increasing water flow rate, and preventing overflow during heavy rains are important considerations in stormwater management, these outcomes are secondary to the primary goal of improving water quality through sediment control. Thus, focusing on sedimentation through inlet protection addresses the most immediate concerns associated with water pollution and stormwater runoff.