open TELEMAC-MASCARET The mathematically superior suite of solvers

I am new in Telemac...I was trying to run the Baxter tutorial case...following the tutorial...I had a few questions regarding the boundary conditions...because I did not find an explicit explanation in the tutorial pdf...firsly, in the downstream boundary a rating curve is supposed to be provided...so in Blue kenue what should be the boundary code?? Should it be Open boundary with prescribed H?
Also in FUDAA..in the tutorial it is shown that liquid boundary files and rating curve are just added...how do I know that which file is imposed on which boundary...Also shouldn't there be two inflow hydrograph files...for Baxter and Tule??