Dear Volker Weitbrecht :
Note that BOSS RiverCAD and BOSS RMS for AutoCAD supports 400 cross-sections per reach, and 100 reaches can be contained in a single drawing file.
If you have any additional questions or need any further information, please contact me again.
Sincerely,
Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com