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Solved by Matt.Anderson. Go to Solution.
Using Rational Method for hydrology...
If the above is true you are using the wrong tool (SSA) for your peak flow storm sewer network analysis. Hydraflow Storm Sewers uses a "form" of the HEC 22 methodolgy that you should be using.
I'm not sure how the method of hydrology really matters here... ?
This is a misuse of the Rational Method. Dynamic modeling software requires the use of hydrograph methods such as EPA SWMM, SCS or your local unit hydrograph method.
Using the Rational Method with a dynamic software like SSA for pipe sizing is the problem.
The correct application of the Rational Method for pipe sizing involves the use of a system tc (time of concentration) along with CxA. Software such as Storm Sewers and StormCAD do this.
Hydrology method discussion aside - I assume that in profile view you are viewing the HGL/EGL values at the initial onset of the analysis, ie, at time equal start.
Use the Output > Output Animation dialog box to step thru the analysis reporting time to simulate the flow thru the system.
I've added SCS hydrology to my model
This is not an acceptable hydrologic method for urban storm sewer pipe design.
The SCS method was devloped primarily as a hydrologic method to be used for earth dam design, spillway design and flood prevention. The method was derived from data within primarily agricultural watershed environments.
The Rational Method is the industry standard of practice hydrologic method for storm sewer system design for typical subdidvision and highway drainage applications.
Long time reader, first time poster.
I am having difficulty exporting the EGL line generated in the Profile Plot. When I expand the CAD Export Options, there are twenty layers and they are all selected. When I open the exported CAD file in Civil 3d (2012 and 2014), there are only 19 layers with the missing layer being the EGL line. Has anyone encountered this problem before?
Thank you.
Matt,
I was having this same problem and stumbled onto your message after hours of head scratching. I'm doing a peak flow analysis similar to the OP... Is there a way to to get the profile plot to plot to the moment of the peak by default? That way we don't have to do through the whole animation everytime we run the analysis just to see the peak?
Or for that matter, is there even an easy way to jump right to the peak other than trying to pick it out from the date and time dropdown in the output animation dialog box?
I am using SCS and i am having the same error . Please see attached.