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Grading Volume Tools Vs. Surface Volume Tools.

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Message 1 of 3
mikeevans
584 Views, 2 Replies

Grading Volume Tools Vs. Surface Volume Tools.

I am in the process of doing a volume balance on a site and wonder if anyone has a work around for this.

I know the grading volume tools will automatically adjust the surface to get a zero balance between the two surfaces but the surface volume tools does not. I was thinking about it and came to the conclusion that I could use the grading volume tools to generate a volume report and balance the surface levels to zero with a bit of "twickery".

Unfortunately it was not a simple operation and failed but here's how I did it.

I imported the existing and proposed surfaces then created a grading group, created a 1m long featureline and graded it as 0.1m flat with the auto surface creation on.

Then pasted the proposed surface into the GG surface and trimmed to a boundary line. From that I was able to use the grading volume tools to create a cut and fill volume and then balance to zero. Unfortunately it only balanced the area of the grading (moving it 8'000m up wards) so I failed to work.

Now I don't really want to create grading around the whole development in order to do this as I know that it will blow up my PC but it seems to be the only method left. Unless anyone knows another method to achieve the same result?.
2 REPLIES 2
Message 2 of 3
Anonymous
in reply to: mikeevans

This would certainly depend on many factors about the specifics of your
site, but...

Why not create a TIN volume surface (eg vs fg), then raise/lower the fg
incrementally, rebuilding the volume/checking the result until you are
'close' enough. There are so many variables (usually) involved in this
situation, it seems like a waste of time trying to get an actual 0 balance
this way.

That's what I've found works *best* for the situations I typically
encounter. Hope it helps.

wrote in message news:5593267@discussion.autodesk.com...
I am in the process of doing a volume balance on a site and wonder if anyone
has a work around for this.

I know the grading volume tools will automatically adjust the surface to get
a zero balance between the two surfaces but the surface volume tools does
not. I was thinking about it and came to the conclusion that I could use the
grading volume tools to generate a volume report and balance the surface
levels to zero with a bit of "twickery".

Unfortunately it was not a simple operation and failed but here's how I did
it.

I imported the existing and proposed surfaces then created a grading group,
created a 1m long featureline and graded it as 0.1m flat with the auto
surface creation on.

Then pasted the proposed surface into the GG surface and trimmed to a
boundary line. From that I was able to use the grading volume tools to
create a cut and fill volume and then balance to zero. Unfortunately it only
balanced the area of the grading (moving it 8'000m up wards) so I failed to
work.

Now I don't really want to create grading around the whole development in
order to do this as I know that it will blow up my PC but it seems to be the
only method left. Unless anyone knows another method to achieve the same
result?.
Message 3 of 3
mikeevans
in reply to: mikeevans

Thanks that's a bit easier than my method although a bit timely guess work but Autodesk it would be nice to have an auto Balance button in the surface volume tools so that you can use to design for overburdens of spoil as well as nearly zero balances.

It wouldn't have to actually modify the levels just give an approx recommendation as to how much it needs to be raised/lowered by to achieve a result.

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