When i do what you say, the result volume surface is in the wrong elevation.
Example: my surface "1" is in (+-) elevation 235.600 and my surface "2" starts from 235.850 to 235.450 (it's like a cup), when i do the volume surface, the result goes to elevation 0.0 (+-), and when i do contour elevation 0.0, it gives me the interserction but in the wrong elevation! how do i put this in the right elevation? because what i want is the (surface 1)-(surface 2)
thanks for your time
If you don't have a good understanding of how Sites work within Civil 3D, I would recommend that you don't use a featureline, just use the same tool and assign the elevations to the polyline instead. If you want more inforomation on why I recommend this, check out THIS.
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