Inlet Openings
Inlet openings are divided into 4 classifications, as illustrated in the following figure:
![](GUID-80B03B7F-CD27-4B74-9F14-9DC7CEC24ACD-low.png)
Inlet Openings
For details on each type of inlet, refer to the HEC-22 Manual, Chapter 4 (see "Pavement Drainage").
The gutter depression is the depression of the gutter relative to the pavement normal cross-slope. Local depression is depression at the location of the inlet. See Gutter and Local Depression.