Balance cut and fill volumes

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We have crated grading groups for our house labs and also

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for our balancing pond.

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We are now going to use these to balance our cut and fill volumes.

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First,

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we are going to use degrading volume tools to

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help us establish the optimum level for a building pad

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from the home ribbon tab, create design panel, select grading creation tools

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use the first button on the tool bar to set the grading group,

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change the site to house plots

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and set the group name

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to house four

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on the toolbar. Click on the grading volume tools button

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except a grading group.

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The grading volume tools will be displayed,

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expand the dialogue using the expand and collapse button. On the right hand side,

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the volume of the group will have been

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automatically calculated and is shown in the dialogue.

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We have a net volume of 218 cubic yards of cut.

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The optimum level for our building pad would be at a net volume of zero.

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You can incrementally raise and lower the grading group by a set value

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using these buttons.

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We're going to balance the volume automatically

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using automatic balancing

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by clicking on this button.

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The required volume is zero.

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Click. Ok.

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The grading feature lines will be automatically raised and lowered

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until the volume is as close to zero as possible.

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You can see in the history

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that the group was raised by 1.6 ft.

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We can repeat this for the other house slabs in the site

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to determine the optimum levels for each.

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We are now going to calculate the cut and fill volume for our pond.

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We have designed our road corridors and created

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surfaces for the formation levels of the roads.

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We can bring these into our model and then

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determine the volume of the roads and pond together.

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We can then use the pond to balance the site volume

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in prospector expand the surfaces collection under the data shortcuts,

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right,

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click on the mcallister boulevard datum surface and choose create reference,

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select a star for the surface that uses background contours.

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Repeat this for each of the other corridor datum surfaces.

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The surfaces are now available in the drawing services collection

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from the analyze ribbon tab. Click on the volumes dashboard button

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use the create new volume surface button

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to create a new volume surface

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name it V

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to mcallister boulevard.

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Don't worry about changing the style

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set the base surface to existing ground on

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the comparison surface to the corridor datum surface.

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The base surface is always the existing surface

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and the comparison surface is your design surface.

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This will create a volume surface made up of depths of cut and fill,

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which is then used to provide cut and fill volumes.

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Repeat this procedure for the other corridor datum surfaces

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in the volumes dashboard,

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there will be an entry for each volume surface with a calculated cut and film

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note that the calculation can include bulking and compaction factors

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for adjusting the volumes. When considering the transportation of material,

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the graft on the left can be turned on and off using this button

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and it shows the combined cut and fill of all the volume surfaces. In the dashboard,

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we have a net volume of 18 178 cubic yards of cut for our roads.

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We want to reduce this and reuse the material in our pond,

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create a volume surface for the pond

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by adding it in the volumes. Dashboard

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name it Volta pond

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and set the base and comparison surfaces.

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We need to first balance the pond using the grading volume tools.

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We currently have a volume of 16,300 cubic yards of fill,

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balance the pond volume to zero using the automatic balance option.

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Now, I can go back to the volumes dashboard

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and note the site volume.

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You may need to select the vault upon surface and rebuild it.

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We have net 18 178 cubic yards of cut.

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So we need the pond to have the same amount of fill.

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Go back to the grading volume tools click on the auto balance button,

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set the required volume of the pond to 18 178 and click. OK.

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The pond grading has been raised to achieve our new net volume.

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Back in the volumes. Dashboard

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use the recompute volumes button

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to refresh the volume calculation.

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You can now see in the graph

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that the total net volume is 0.93.

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We have used the pond to balance the cut resulting from the road design.

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In this example,

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we have shown you how you can use grading groups and services to trade off cut and fill

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to achieve an overall balance site volume.

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In practice,

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it may not be possible to raise a pond like this and

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we might need to use other design objects to trade our volumes.