AutoCAD Civil 3D Wishes

AutoCAD Civil 3D Wishes

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Valued Contributor
89 Posts
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Registered: ‎05-04-2010
Post 1 of 7

average slope calculation

1294 Views, 6 Replies
05-20-2011 09:43 AM

It would be nice if autocad could generated an average slope calculation table.  With elevation, length, of each contour, total length, and then show average slope in percent with the math shown. This is a requirement of Santa Clara county. I do not know if other counties have this requirement, but if they do it would be a big help for me and others if AutoCAD did this.

 

Thank you,

 

Roger

Michael Merlino
Civil Engineering Technician / "CAD Manager"
SAN JOSE, CA, USA
Distinguished Mentor
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Registered: ‎03-18-2008
Post 2 of 7

Re: average slope calculation

05-20-2011 11:04 AM in reply to: MichaelMerlino7407

Where's the math you mention?

 

I'm a programmer, not an engineer, so please forgive my question. What are you wanting the slope of in the report?

 

The reason I'm asking is we are working on a slope reporting application for existing lanes along an alignment that gives edge of pavement elevations, crown elevations, and lane slopes at specified stations.

Mike Robertson
FL. Dept. of Transportation
CADD Applications Developer
*Expert Elite*
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Registered: ‎05-21-2003
Post 3 of 7

Re: average slope calculation

05-20-2011 11:34 AM in reply to: MichaelMerlino7407

" length, of each contour"

 

And I thought people around here were loony! All we have to show is a slope map with ranges. The higher slopes are either partially or fully deducted from the lot area.

 

Allen

Employee
720 Posts
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Registered: ‎08-25-2009
Post 4 of 7

Re: average slope calculation

05-20-2011 11:39 AM in reply to: MichaelMerlino7407

Roger,

 

Could you post a small example of what you are looking for?

 

Regards,

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

Valued Contributor
89 Posts
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Registered: ‎05-04-2010
Post 5 of 7

Re: average slope calculation

05-20-2011 11:49 AM in reply to: MichaelMerlino7407
 
Michael Merlino
Civil Engineering Technician / "CAD Manager"
SAN JOSE, CA, USA
New Member
1 Posts
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Registered: ‎07-21-2011
Post 6 of 7

Re: average slope calculation

07-21-2011 11:16 PM in reply to: peterfunkautodesk

It is a relatively simple but time consuming exercise which requires the designer to measure the plan length of contour lines on a parcel of land..

The maths then amounts to :

 

S= 100 * I * L /A

 

Where

S = Average slope

I  = Contour interval

L = Total length of all contour line on parcel being considered

A = Area of subject parcel

 

Obviously the contour intervals have to be constant for this to work properly.

 

Regards

 

     

 

Distinguished Mentor
910 Posts
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Registered: ‎03-24-2009
Post 7 of 7

Re: average slope calculation

07-26-2011 12:01 PM in reply to: MichaelMerlino7407

Here's an option I created, if you don't want to wait for Autodesk: http://blog.civil3dreminders.com/2011/07/average-slope-by-contour-lengths.html

 

I'll be up in the bay area in a couple of weeks if you want an in person demo.

 

Christopher

http://blog.civil3dreminders.com/

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