What type of inlet protection should be used for a curb inlet with an associated open grate on the road?

The most appropriate choice for a curb inlet with an associated open grate on the road is combination inlet protection. This type of inlet protection is specifically designed to address both the curb inlet area and the open grate, effectively capturing sediment and debris before they can enter the drainage system.

Using combination inlet protection is essential in situations where both components are present because it ensures that runoff from the road is properly filtered. The design typically incorporates features that allow for the management of stormwater while preventing sediment-laden water from bypassing the protection measures. This ensures that sediment control is maximized while still allowing for efficient drainage.

Inlet protection types such as standard inlet protection, curb inlet protection, or at-grade inlet protection do not adequately account for the unique configuration of a curb inlet with an open grate. Therefore, they may not provide comprehensive control of sediment and erosion, which is critical in maintaining water quality and infrastructure integrity.