Most probably there is nothing wrong with your computer. The parametrs
you have loaded in your model, can not calculate a logical prfile and
the programs just terminates. Try inputing very low flow data into your
river model, because most probably you are getting illogical water
surface elevations. You are getting exagerated values since probably
your flow data can not occur in such a constrain river reach.

Juan L. Melendez
lebonne@sanjuanstar.net