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Using Neenah Grates in Stormcad

Using Neenah Grates in Stormcad

Using Neenah Grates in Stormcad

(OP)
I want to use a Neenah grate in Stormcad that does not fit any of the "grate type" options based on HEC 22 that StormCad allows you to choose from.  I want to use Neenah R-3402E.  The "G" dimension is 2 5/8 x 6 1/2.  Since this does not fit any of the HEC 22 types then how do you properly model the chosen inlet capacity accurately?  If I pick the closest type then the program will calculate the gutter spread, etc. based on the capacity it calculates but not on the actually square foot opening of the inlet I have chosen.  Has anyone ran into this problem before?

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