This option computes the volume of a stockpile given a boundary string around the base of the stockpile.
The boundary string can in fact be any closed string, it does not need to be actually entered as a
BOUNDARY string. Note: the program has a restriction and will only allow one Boundary string to be entered.
The program will first form the lower surface model using the points on the boundary string of the stockpile.
It will then form the upper surface model using all the points inside the boundary string and
compute the volume of each triangular prism formed.
The results will be displayed on the screen and optionally written to the listing file.
Points to Note
- The base, or ‘underside’of the stockpile is assumed to be flat. i.e. Prior to building the
stockpile, the natural surface is assumed to be flat from one side to another. This is
important! Consider the overall size of your stockpile base and inspect 0.1m contours
within to asses the validity of the base and whether this Stockpile Volume method is
- Stockpile volume reports do not provide cut/fill quantities. If cut/fill is required, then a
volume between surfaces should be calculated;
- The reported volume is a basic nett value;
- You should have a single, closed string that defines the base of the stockpile;
- The stockpile base string can be of any type or code, or on any layer. e.g. ‘Boundary’,
Discon, Traverse, BB, BTL, LL… provided the triangulation is correct;
- The stockpile can exist in amongst surrounding survey data so it does not need to be in
an isolated acs file.
How it Works
- Ensure stockpile bases have a single closed string.
- Inspect data, triangulate model, contour at 0.1m and resolve any errors.
- Review triangles and ensure there are no ‘holes’ (shade triangles).
- Topo>>Stockpile Volume. Click on stockpile base string.
- Choose listing file (*.LST) – this is advisable, though not mandatory.
- Click “compute”.
- Refer to *.LST file or copy/paste report into email or acs file as necessary.
- Verify volume report using a common-sense approach such as calculating surface area x
average height and via an alternative method such as ‘between surfaces.’
- User nominates stokpile 'boundary' string
- It Forms triangles for bottom surface only using points on the 'boundary' string
- Project points inside 'boundary' on the stockpile onto bottom surface and compute bottom RL
- Form triangles using all stockpile points
- Calculate the volume between stockpile and bottom surface using the triangular prisms.
- Display the results: Cut, fill volume & surface areas.
- Discard triangles, discard all interpolated points from job, discard bottom suraface.