Thank you very much for the information Chad. However, even in page 64-65, the manual does not specify what it is (the Hm). If the soil-air interface is assigned to be a variable boundary, my model works well with the precipitation period but does not make sense with the evaporation flux. On the other hand, if the specified flux was assigned to the interface (either positive or negative values), the model works OK. Thus, I am really confused. Is there any comment or suggestion please?
Hi, Can any one explain what is the minimum pressure head in FEMWATER please? When a variable flux boundary is assigned (in FEMWATER), is it necessary to specify the ponding depth and minimum pressure head (in the variable BC options)? Thank you very much for your help.