I am running a *.stm file in C3D 2012 and then in C3D 2013 and I am getting different results. Specifically, the some of the HGL have changed by up to 0.9 ft, the friction slope in the newer version is typically 0.000, and there are differences in some of the EGL, velocity head and minor losses. The design codes appear to be the same in both. I have tried a couple other *.stm files and am getting different results w/ them also. Is there a setting or something that I am missing?
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Please verify that which versions of 2012 and 2013 that you are running. There were some changes in 2012 SP2 and 2013 SP1 that might cause the disjointed calculations.
Can you open a support case?