
There are other volume calculation programs similar to QSOnscreen out there in cyberspace. Most are commercial products but Cut+Fill by Robert Goddard is freeware like QSOnscreen and I thought it would be a good idea to run QSOnscreen with the same test data which is included with the Cut+Fill download package to see how the results compare. Robert Goddard is a fellow construction professional who takes a keen interest in the various methods of earthworks calculation. You can download the latest version of his Cut+Fill program from here. 1. Spoil heap comparison with AutoCAD addonThis is the spoil heap whose volume is being calculated. The spoil heap boundary is shown with existing levels in black. The image also shows a 25m grid which can be used to calibrate it in QSOnscreen. This is a screenshot of the QSOnscreen output. The calculated total of the spoil heap is 2401m3. This is a screenshot of the Cut+Fill output. The calculated total of the spoil heap is 2353m3. Cut+Fill will also output a breakdown of the final quantity as traditional dimensions used by a quantity surveyor. The spoil heap volume reported by the AutoCAD addon is 2406m3. This gives an overall variance of about 2% between the three calculations. 2. Comparison with SiteWorx Practice PlanThis is the Vertigraph SiteWorx practice plan whose cut and fill volumes are being calculated. Existing level contours are shown in green and finished level contours are shown in red. In addition, the building and car park are to be reduced down to appropriate formation levels as noted on the plan. The overall site area is given as 75,670 m2 which I used to calibrate QSOnscreen. The complexity of this exercise required that the overall site was divided up into appropriate sections for calculation by QSOnscreen and the resulting quantities were accumulated as a separate operation at the end to give the final totals. I decided to divide the site up into 6 arbitrary sections as per the coloured up plan above. These are screenshots of the 6 QSOnscreen outputs (A to F).
The accumulated total for the six partial site areas is shown in the table above. This is a screenshot of the Cut+Fill output. The total volume of cut is 30527m3 and the total volume of fill is 59243m3. As reported by SiteWorx, the total volume of cut is 32422m3 and the total volume of fill is 55482m3. This gives an overall variance of about 6% between the three calculations. However, the QSOnscreen and Cut+Fill results are very similar (< 1% variance). 3. Car Park comparisonThis is a comparison between QSOnscreen and Cut+Fill using the car park example from the QSOnscreen tutorial which ships with the program. This is a screenshot of the QSOnscreen output for the car park which appears in the QSOnscreen program operation tutorial. The calculated total volume of cut is 28.7m3 and the total volume of fill is 23.0m3. This is a screenshot of the Cut+Fill output. The calculated total volume of cut is 27.5m3 and the total volume of fill is 24.7m3. This gives an overall variance of about 6% between the two calculations. If you want to experiment with any of the above calculations in QSOnscreen yourself you can download the relevant images and (.qso) data files here

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