§ 7.2.5.1. Inlets

The drainage system will include inlets on streets, parking areas, and other areas to direct flow into the underground system. For inlets on streets, the HGL at the inlet should be below the gutter and the EGL not be above the top of curb or ponding depth. For area inlets the EGL should not be higher than the ponding depth.

An inlet could also be a pickup structure that channelizes flow from an upstream channel into the underground system. Careful analysis of the junction between the downstream underground system and the upstream channel should be performed to check both the HGL and EGL.