Bottom slope definition

[ypodomi]

According to the HEC-2 input descriptions (RMS manual, paragraph 4.11 – Channel Improvements, p. 4-62), if a value between .00001 and 0.1 is specified in the Invert elevation data entry, then this value describes the channel improvement bottom slope, which is then propagated upstream etc.

We are currently using the BOSS RiverCAD package and cannot make the program “understand” the bottom slope definition. The excavation pattern doesn’t appear at all in the cross-section. We have, therefore, entered the invert elevation manually section-by-section (having calculated it inside excel). This works, but it is really tedious. Is the bottom slope definition different inside RiverCAD?

Does anyone have any clue on how the bottom slope should be defined?

[Chris Maeder]

Note that the bottom slope is handed off to HEC-2, and HEC-2 uses this value to compute a cut through the defined cross sections. As such, it is not something that RiverCAD generates on the cross section plots--it is handled by HEC-2.

If you continue to run into problems with this, please send me your file and I will look at it.

Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com