Hi,
In the next version (7.2, to be release later this year I think?) you will find a rainfall-runoff model which offers the possibility to define rainfall in different ways, one of them being reading a hyetograph from a file.
This rainfall-runoff model is already available on the trunk. Look at subroutine /telemac2d/runoff_scs_cn.f. There is also a new test case in examples/telemac2d/pluie.
Meanwhile, the only way to define rainfall as a hyetograph in current version is to program this in subroutine prosou.f (look at the RAIN or EVAPORATION part, variable RAIN_MPS that you can define as a function of time). There should be some example on the forum?
Best regards
PL