Several of the HEC RAS manuals are now online (under various levels of construction):
https://www.hec.usace.army.mil/conflu...
The 1D Sediment Manual is in Good shape:
https://www.hec.usace.army.mil/conflu...
For more information, check out the sections on:
Observed Data:
https://www.hec.usace.army.mil/conflu...
and the New Sediment Plotter:
https://www.hec.usace.army.mil/conflu...
We are continuing to improve the plotter during the 6.0 Beta test period.
The model used in this demonstration is documented in this paper:
http://www.sedhyd.org/2015/openconf/m...