Dear Giulio Ghezzi :
Note that the NWS DAMBRK variable NTT (number of discharge and stage hydrographs) is automatically determined by BOSS DAMBRK. In BOSS DAMBRK you are allowed to define a maximum of 6 discharge and stage hydrographs, on a cross-section by cross-section basis.
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