How is surface temperature computed ?

[burkhart68]

In dealing with surface pool evaporation, I need to understand how is the surface temperature computed by CS. When I force it through a user formula Ts(t) in the IHM, it seems to be recomputed and doesn't correspond to the imposed one. When I try to force a Dirichlet value for the variable itempb (ground temperature) in a rough Wall boundary condition, CS refuses to run. Thanks for clarifying this point ! Stephane Burkhart