AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Distinguished Contributor
martin888888
Posts: 231
Registered: ‎01-27-2011
Message 1 of 6 (178 Views)

Lowering a surface

178 Views, 5 Replies
11-01-2013 10:35 AM

I have a 5 acre surface which includes a 2 acre parking lot.  I want to lower only the parking lot area to bottom of subgrade level and then grade back to surface at 10:1 for mass grading purposes.  Anyone have any good ways to do this? Thanks

Active Contributor
hmartinez5
Posts: 41
Registered: ‎06-24-2011
Message 2 of 6 (172 Views)

Re: Lowering a surface

11-01-2013 10:52 AM in reply to: martin888888

I would create a Featureline of the parking lot area. Raise the featureline to the EG surface. Then Lower by Subgrade depth and daylight to EG with the desired slope with the grading tools. Finally add the Featureline and grading to a surface to calculate the volumes required.

*Expert Elite*
troma
Posts: 2,520
Registered: ‎05-21-2008
Message 3 of 6 (169 Views)

Re: Lowering a surface

11-01-2013 10:55 AM in reply to: martin888888
New surface.
Paste in the surface you have.
Add a boundary (parking lot)
Lower the surface by the subgrade depth.

Do the 10:1 slope as suggested by hmartinez5


Credit where credit is due! Give kudos or accept as solution whenever you can.

Distinguished Contributor
martin888888
Posts: 231
Registered: ‎01-27-2011
Message 4 of 6 (98 Views)

Re: Lowering a surface

11-04-2013 07:57 AM in reply to: troma

Thanks.  After adding a boundary and lowering the surface I beleive you will then have to paste it back into your orginal surface

*Expert Elite*
troma
Posts: 2,520
Registered: ‎05-21-2008
Message 5 of 6 (93 Views)

Re: Lowering a surface

11-04-2013 08:07 AM in reply to: martin888888
Sounds like a circular reference to me....paste A into B, then paste B into A? Bad idea.

If you need the complete site, with part lowered and part not lowered, I would take A (complete site original), paste into B, add boundary to B and lower it.
Do your 10:1 thing and paste that onto B.
Then make surface C, paste in A, paste in B.


Credit where credit is due! Give kudos or accept as solution whenever you can.

Distinguished Contributor
martin888888
Posts: 231
Registered: ‎01-27-2011
Message 6 of 6 (62 Views)

Re: Lowering a surface

11-05-2013 09:05 PM in reply to: troma

Exactly.  Thanks

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