Because of the database structure that is implemented in AutoCAD, we cannot access all of the cross section data at once. Therefore, we are not able to provide a table view of the Manning's values for all cross sections.
However, this is a very good idea, and I will ask our developers to look into other ways that we might be able to implement this.
Sincerely,
Chris E. Maeder, M.S., P.E.
Senior Technical Engineer
chris.maeder@bossintl.com