Quicksurf 2011 Dredging Calculation Problems

[RTE618]

Hi,

I was hoping someone could assist me with a conflict I'm running into with dredging calculations using Quicksurf 2011. The main issue I'm having is when I run the Area Volume command the surface "cut" is only being taking from border of the polyline I create, not the entire area it includes. The existing surface from the hydro survey I'm using is created correctly. It's just when I create a boundary with a certain elevation, the depth is only recognized on the line itself, not within the entire area.

Anyone run into the same issue or have any suggestions?

Thanks