A separate addendum consisting of the complete FHWA documentation for HEC-12 "Design of Highway Pavements" is provided as part of the documentation for user training courses. Contact your account representative for additional information.




This implementation of HEC-12 supports;


Grated Inlets,

Curb Inlets,

Slotted Inlets, and,

Combinations of grate and curb inlets.



The capture efficiency of an inlet can be increased by having a locally depressed gutter section (inches, mm).


The inlets may be located on either continuous grades or in sumps.