# Volume Calculations in GeoSurvey

There are three volume calculation methods in GeoSurvey:

- Volume Between Surfaces – Gives Cut/Fill quantities between two surfaces
- Volume to a Base Level - provides ‘bulk fill’ volume of a single model or overall difference between two surfaces
- Stockpile Volume – provides ‘bulk fill’ volume of a single model

Click on one of thes items above for more detailed info:

**Additional information**

- Max Tri Length restriction should be BLANK (Triangle Parameters).
- Use no-contour/no-tri and boundary strings to restrict triangulation instead of setting the Max Tri Length.

- ALWAYS compute volumes using more than one independent method. Consider doing

these in different software. *Don’t forget the simple common-sense approach such as calculating
surface area x average height to get a rough appreciation of what to expect.*

**General rule – cut/fill interpretation: **

Cut = the amount of material that has to be **removed** for the base surface to equal the
comparison (“Top”) surface.

Fill = the amount of material that has to be *added* for the base surface to equal the
comparison (“Top”) surface.
**Nett = Cut minus Fill quantity. **
- “Volume to a Base Level” is generally understood to be the most accurate method.
- Stockpile volume reports in GeoSurvey do
**not **provide cut/fill quantities.
**Adding a Boundary: **

(a) Append a Boundary with no heights from another job.

(b) Change it to a Discon

(c) Interpolate heights for its points from the existing triangulation surface

(d) Revert the string to a Boundary

(e) Run final triangulation on the model
**General rule - interpolation **must be done from an entire model’s triangulation surface
and not at the model fringes, otherwise incorrect heights may be obtained.