Applies To
Product(s):	StormCAD, CivilStorm, SewerGEMS
Version(s):	V8i, CONNECT Edition
Area:	Modeling
Original Author:	Scott Kampa, Bentley Technical Support Group

Problem

How can the following user notification be resolved: "Grate inlet opening width cannot be larger than the depressed gutter width."

Solution

The width of the grate inlet cannot be greater the the width of the depressed gutter. Check the catch basin properties to make sure the correct input is entered. Keep in mind that the width in the catch basin is perpendicular to the direction of flow.

For an inlet that does not conform to the HEC-22 standard methodology used by the grate, curb, slot ditch and combination Inlets in the Inlet Catalog, consider using the "Gutter Depth vs. Captured Flow", "Flow to Inlet vs. Flow Captured" inlet types. These enable you to provide an externally-obtained rating curve to model the performance of your inlet. See more here: Modeling Custom Inlets Using Inlet Capture Curves

See Also

Why does the gutter need to be defined in both the catch basin and gutter element?