AutoCAD Civil 3D General

Posts: 199
Registered: ‎04-14-2009
Message 1 of 5 (381 Views)

Catchment Area Enhancements

381 Views, 4 Replies
11-15-2012 06:30 PM

I wish to have the ability to define runoff coefficient regions of a surface (using parcels, closed polylines, aecpolygons, mpolygons, etc...) such that when a catchment area is created, the weighted runoff coefficient is calculated. For a corridor surface, the runoff coefficient can be specified by the link code used to define the surface (defined in the code set style).


These surface coefficients should continue through pasting operations, i.e. a final design surface should have the runoff coefficents from the various corridor and grading surfaces used to define it.


Currently, I have to manually calculate the weighted runoff coefficient by first determining grass, aphalt, roof, areas per each catchment area.

Nathan Selles-Alvarez, P.E.
Senior Civil Engineer
Active Contributor
Posts: 40
Registered: ‎08-26-2010
Message 2 of 5 (367 Views)

Re: Catchment Area Enhancements

11-15-2012 09:30 PM in reply to: el_nath
I think that would be a huge help as well. Some sort of cover condition could go a long way I'm Civil 3D to adding intelligence to the model, including assigning cover parameters to surfaces... that would really start to make it more of a "BIM" system
Valued Mentor
Posts: 1,086
Registered: ‎01-07-2011
Message 3 of 5 (346 Views)

Re: Catchment Area Enhancements

11-16-2012 05:33 AM in reply to: cpennetti

Yes, along with %impervious, SCS curve numbers, N-imperv/Perv and D-Store Imperv/Perv.


Multipurpose these defined surface areas: There should be an additional database field for surface material thickness that can be used to define the subgrade datum for earthwork calculations.

Fred Ernst, PE
C3D 2015
Ernst Engineering
*Expert Elite*
Posts: 487
Registered: ‎01-14-2009
Message 4 of 5 (344 Views)

Re: Catchment Area Enhancements

11-16-2012 05:42 AM in reply to: el_nath

All of you should post this to the Wishes discussion group!  Also, on the AUGI wish list.

Lisa Pohlmeyer

C3D 2012 SP4, evaluating C3D 2015
Please use "Accept as Solution" if this solved your issue.
Posts: 199
Registered: ‎04-14-2009
Message 5 of 5 (337 Views)

Re: Catchment Area Enhancements

11-16-2012 06:21 AM in reply to: el_nath

You know I thought I did post this on the wish list. My bad (and working far too late!)

Nathan Selles-Alvarez, P.E.
Senior Civil Engineer

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