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In the StormNet how does one model a drop inlet that isn't necessarily against a curb. Choosing a Neenah grate is appropriate, but if the inlet is out in the middle of a field I am not sure what the correct settings would be when looking at the "roadway & gutter specifications".
This is a question I asked back on the Boss message board a while back as well and no solution was available. I should have clarified that I am particularily interested in a sump situation... i.e. a grate (or in Virginia: a drop inlet) that is in a field/lawn/etc. A generic HEC-22 median grate is on grade however. In place of this, I have taken to just modeling a sump grate as a junction assuming that a standard drop inlet is quite large and there is not likely to be any significant ponding, but a times we use small diameter inlets such as 12" and it would be nice if SSA developed the functionality to have a grate inlet in sump conditions with water able to enter on all sides.
If I haven't missed something in SSA or you do not know of a solution to my question, please tak this into consideration as Autodesk continues to tweak the product.
Junctions assume 100% flow, but you could apply a ponded area to that junction to simular the expected peak flooding area.
I think you could model the yard inlet as a the equivalent Neenhah grate, but in a sag condition. The roadway/gutter data would apply to your ditch slopes, but it would assume 1/2 of the flooding cross-section.
Do you have a specific grate family that you use or can point me to a use case? If so, send me a copy. matt dot anderson at autodesk.com
Matthew Anderson, PE CFM Product Manager Autodesk (Innovyze)
was this ever resolved? I've got the same requests; i'd like to be able to build my own inlet library, as the standards that come with SSA dont really apply to VDOT standard parts. How would i go about adding the following systems in Section 100 of the drainage manual;
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