Yes. 1) Create mesh of existing topo, measure volume. 2) Modify contours to proposed topo, measure volume again. (Optional: modify contours of a copy
of the existing topo mesh.)
This method provides bank volume of the changes without regard to changed density of fill.
ArchiCAD 12; Artlantis Studio 2
MacBook Pro 2.4 Core2Duo, 2GB, OSX(10.5) and XPpro(SP3)