I really appreciate the help. Attached are two files: 1 file has 0 values on the volume table, and the other file has Sample line group Properties.
Surface 3 is the surface that has the existing actual survey points . Do I have to pick another surface : the other two are the surfaces I created in the Corridor as surface boundaries , Top and Datum .
Are you trying to get an earthworks volume? You're almost there.
In the Sample Line Group Properties, on the Sections tab, what I would do from where you are:
Change the Quantity Type for Material (5) to Earthworks.
Go up to where it says Select Surface: and in the drop down is Surface3. Press the Plus Sign. Now go back to the dropdown and pick the surface that represents corridor datum. Press the Plus Sign.
Set the Condition of Surface3 to Base and of Datum to Compare. Press OK.
Run your vol report and you should have volumes.
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