Mike. Thanks (and Hi). The first method won't give me the results I need because banding (and generating banded volumes from) the volume surface gives me those volumes at "depth increments" and not "elevation increments". Does that make sense?
The strata model idea sounds more like what I'm trying to get at - I have no idea where to look for info on that. I guess I'll check F1 to start.
Thanks.
There is an older tutorial for this on my site... (it's free to download)
basically you need a grid of points across this silted area
for each point on grid you will create the elevation data in a xls, or mdb file
then within C3D you create point groups and xdref/point overrides to map the different data to the same grid points
use this point groups to build the various silt strata
so you would have point groups like Zero sediment these points would be the as designed channel bottom
6 Months Sed projected depths; etc