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Tieing Into Existing Berm

23 REPLIES 23
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Message 1 of 24
taneum
607 Views, 23 Replies

Tieing Into Existing Berm

This is a real doozy my boss wants done.  We have and existing sewer lagoon with 4:1 side slopes.  We are designing a bypass pipe outside of the 4:1 side slope but because of cover issues, we need to add some dirt to the side slope to fill above the pipe.  He wants to continue that 4:1 side slope up until it matches the profile elevation abaove the pipe.  Once that happens, then grade a 12' wide berm with 2% crown each way and then come back down the other side at a 4:1 until it matches existing grade.  We drew a target line at the tope of the existing 4:1 on the existing ground and used that as a start point. 

 

Here is the problem, we are using the "linkwidthandslope" sub-assembly, how do we tell it to go up at a 4:1 until it matches our design profile grade?  Horizontally, that right side of the sub-assembly wil be different in every cross section,but vertically it needs to match the profile.  The left side of the sub-assembly is working okay and tieing in at the top of the existing 4:1 slope.  The right side of the sub-assembly though is tieing in at the design profile grade vertically and at the alignment centerline horizontally.  When this happens, my slopes all differ and they cant, they need to go up at a 4:1 so the existing 4:1 slope continues going up.

 

Does this make sense to anyone?  Its a tough one.

 

Attached are some pictures.

23 REPLIES 23
Message 21 of 24
troma
in reply to: Lisa_Pohlmeyer

Does the LinkSlopeToElevation link allow you to target a profile, or just choose a set elevation?


Mark Green

Working on Civil 3D in Canada

Message 22 of 24
fcernst
in reply to: troma

Yes, so does LinkSlopeAndVerticalDeflection.

 

Capture.JPG



Fred Ernst, PE
C3D 2024
Ernst Engineering
www.ernstengineering.com
Message 23 of 24
troma
in reply to: fcernst

That would to be the way to go then.  The OP was worried:

 

 

"Lisa, good thought but the "linkslopetoelevation" want a constant elevation to project up to.  In my case, the 4:1 slope needs to continue project up until it meets the design profile elevation at that particular cross section."

 

but if you can target a profile, then start at the top of berm with this link, target the design profile at 4:1

 


Mark Green

Working on Civil 3D in Canada

Message 24 of 24
fcernst
in reply to: troma


Oh yeah...she had it nailed down from the get-go dude...

 

 



Fred Ernst, PE
C3D 2024
Ernst Engineering
www.ernstengineering.com

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