Parameters
On the Parameters tab of the Create Waste Dump form, set the design parameters of the generated dump or stockpile.
Design
The design parameters (for both Bottom up and Top down methods) are Slope angle, Elevation level, Lift height and Berm width.
Slope angle
The Slope angle is the angle between the horizontal and the line that joins the toe and the crest of each lift. The angle is measured in degrees with a range between 0° and 90° and decimals of a degree. In practice the range is normally between 20° and 40° degrees depending on the materials of the dump and the dump foundation.
Berms
Select the Berms check box when the sides of the dump or stockpile are not constant. In this case, Lift height and Berm width parameters are required:
The Lift height is the vertical distance between the toe and the crest of each lift. Due to clipping by the surface DTM, the Lift height of the generated dump may sometimes be less than this specified value. The height is measured in grid units.
The Berm width is a constant horizontal distance between the crest and the toe of each adjacent lift. The Berm width is measured in grid units.
Design Method
If you have chosen to generate the dump or stockpile in a top down direction, you can either specify the Z of the top surface, the shape of which is represented by the initial boundary polygon. If a Target volume is specified, the process will adjust the Z of the top surface until the target is achieved.
If you have chosen to generate the dump or stockpile in a bottom up direction, the toe boundary is draped onto the topography, projected down to the lowest point of the surface and then projected upwards to the specified Z, or to meet the specified volume.
Report
Swell factor, Density and Compaction parameters are optional. If they are left blank, the process will not calculate volume, in loose and dense form, or tonnage. If they are specified, the process write them to the Report file and use them to calculate the following values:
- Density, Slope Angle, Swell Factor, and Compaction Factor (if specified)
- LCMs and BCMs (the volume of the material in Loose and Bank Cubic Metres)
- Toe Polygon Area (the projection of a polygon where the bottom of the dump meets the topography). There are two types of area: Projected (in Top view) and Actual (the absolute area)
- Top Surface Area (the designed or projected top surface of the dump)
- Top Surface Z (the specified or calculated elevation of the top surface)
- Height (min to max)
- Overall (Interramp) Angle
Density
Enter a (Bank) Density value.
The Density parameter allows the tonnage to be calculated. Density is measured in tonnes per BCM to two decimal places.
Swell
Enter a Swell factor as a percentage.
The Swell factor is always positive and is equal to or greater than 0%. It is measured as a percentage, for example 40%.
Compaction
Enter a Compaction factor as a percentage.
The Compaction factor is always positive and is equal to or greater than 0% and is less than 100%. It is measured as a percentage, for example 20%.
If it is omitted, then the Compaction factor is assumed to be equal to 0% by default. In this case, the loose volume and the compacted volume are the same.