How to create an offset of existing groond in the View section?

[ali.alavinia4]

How is the volume of drainage behind the embankment with a thickness of 20 cm along the cross section and above the existing ground automatically calculated automatically? Stripping Top Soil is not the solution.

[hamidatut72]

it's easy to do. you need to create the third surface by pasting and then raising/lowering it. then add the pasted surface to your sample line group and add it to your computed material/compute a new one. so now compute the materials with 3 surfaces. adjust the above/below. finally, you end it up.