check the zero points and other settings that are required to do the calculations., each calculations has some different requirements, also check...
best is to create surface in maxsurf, render it in rhino ,, use for calculation autohydro or hydromax, and for detail construction design sc or...
i see.. u know a lot of software name only lol :D
its not free for Teacher ( how to know u r ? ) ... ;) buy it
hmmm vn - china !