• boundary conditions MIKE 21 FM HD

    I'm studying hydraulic engineering at University of Udine, Italy. I'm doing some tests with hydrodinamc module of MIKE 21 FM.
    I’m dealing with some questions to solve.
    I need to know the relations that MIKE 21 FM HD uses between the variables along an open boundary: more in detail i need to know how the velocity components are calculated if i select a level boundary condition or a flux boundary or a discharge one.
    In the same way i would like to know the equations used to determine the level (surface elevation or total water depth) if a velocity or a flux boundary are imposed.
    Is there anyone who can help me?
    Thank you.