Assistance Needed with Managing Sewer and Storm Line Overlaps in AutoCAD

[ishaq03]

Hi Everyone,

I’m currently working on a project in AutoCAD where I need to manage sewer and storm lines within a drawing. Specifically, I need to:

• Identify and retain sewer lines that directly intersect with or oppose storm lines.
• Remove sewer lines that do not intersect with the storm lines.

To provide more context, the storm lines are currently coloured white, and the sewer lines are coloured red. I’ve been manually selecting and modifying these lines, but I believe there might be a more efficient way to handle this task, possibly through a LISP routine or another method within AutoCAD.

Here are my specific questions:

1. Is there an existing AutoLISP routine or tool within AutoCAD that can help automate this process of filtering and managing these line overlaps?
2. Are there any best practices or workflows recommended for handling this type of task in AutoCAD?

I’ve attached an example image and DWG file to illustrate the issue I’m facing.

Thank you in advance for your time and assistance.

[ec-cad]

Hmm,

I don't see a way to do that automatically, best you could do is to make a seperate selection set of lines on

the layers. Then the questions begin. Are you 'adding' some lines to the existing ?

Are there any rules about how many sewer lines can connect to a storm line ?

What if you draw a ray from a given sewer line, and find (no) intersections to (anything) ?

etc.

Good luck with it.

ECCAD

[Sea-Haven]

1st step for checking would be that the sewer and storm water pipes are made into a tree, using layers, a stormwater would have main runs then sub runs then sub sub runs etc, same with the sewer and the house connections would be just that on a different layer. having single segment linework is holding back look for touching objects, the other check should be are they to close when parallel.

If you look at Civil design software it uses this tree approach, have to think whether collision is included definitely the software has check for obstructions like water, telecom, elec etc. May be able to look for dummy layer a copy of sewer or stormwater.

Are you using say CIV3D or another 3rd party drainage design software.

[pendean]

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@Sea-Haven wrote:

...Are you using say CIV3D or another 3rd party drainage design software.

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OP seems to be doing it the hard way with just lines and plines (although the DWG contains MAP3D markers in it)

[Kent1Cooper]

That doesn't sound too difficult, and a little less so because everything on one of the Layers is Lines, and on the other, Polylines -- a routine could find all Lines on the Sewer Layer, and for each one, use its endpoints as a Fence to select any Polylines on the Storm Layer that cross it, and if there are none, delete it.  Is the task as simple as that?

But one significant question -- In this situation:

that one selected Line by itself does not intersect any Storm-Layer Polylines, so should it be removed [easy]?  Or because it's part of a "line" [not in the AutoCAD meaning of the word] of piping that does intersect some Storm-Layer Polylines, should it remain [much more difficult, if even possible]?

[And just in terminology:  What does it mean for a Sewer line to "oppose" a Storm line?]

A drawing with the same Layout twice, showing before and after conditions, would be helpful.

[Sea-Haven]

The smaller red lines are indicating sewer branches and yes would work better with your idea if they were on layer sewer-branch etc so can be turned off else would be detected possibly.