HEC-22 Inlet Capacity Calculations
Note: Pavement drainage requires consideration of gutter flow and inlet capacity. The design of these elements is dependent on storm frequency and the allowable spread of storm water on the pavement surface.
The primary methodology used by CivilStorm to perform pavement drainage and inlet computations is described in Chapter 4 of the HEC-22 manual: Urban Drainage Design Manual, 2009. This chapter is included as Pavement Drainage on page 4-1. Related charts can be found in the Appendices. Most of the information presented in HEC-22 Chapter 4 was originally published in the 2nd edition, August 2001 Pub No FHWA-NHI-01-021FHWA, and AASHTO’s Model Drainage Manual, 1991.
This section presents an overview of the HEC-22 methodology used by CivilStorm . For more information, refer to Pavement Drainage on page 4-1 or the HEC-22 documentation.