AutoCAD Civil 3D :: Inlet Bypass And Street Section Modeling

Jun 27, 2012

We recently began experimenting with SSA and are trying to verify the inlet calculations that were done in excel to make sure we understand the software before putting it into everyday use. We've created a custom parabolic street section and applied it to the bypass links, and as far as that aspect goes, we understand it and it's all working great.

How to model inlets directly across from each other in a street section. The issues arise when the top width (of Inlet 1, in the attached graphic, for example) exceeds the half section width and flows over the crown into the opposite side of the street (to Inlet 2, in attached graphic).

We have tried weirs and flow diversions to no avail. Attached is an example of what I'm trying to explain. Inlets 1 and 2 are opposite from each other, and both connect into a MH labeled SD-J 29+33.00. Link-05 connects to the next downstream MH, and there are 2 links that follow the gutter lines to the North used as bypass links from Inlets 1 & 2.

Civil 3D 2014
Windows 7 Professional
Intel Xeon E31270 @ 3.4 GHz
8 GB, 64-bit

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