AutoCAD Civil 3D - Stormwater

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Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 1 of 6 (228 Views)
Accepted Solution

Shape Factor

228 Views, 5 Replies
09-13-2011 02:00 PM

Does anyone know which value of Shape Factor SSA uses? In my office, before I joined, Hydraflow was being used where Shape Factor was one of the input values. When I used SSA for my project, it didn't ask for Shape Factor value. So I am not sure if it assumes a particular value.

 

Thanks,

KD

Employee
Matt.Anderson
Posts: 2,901
Registered: ‎05-13-2005
Message 2 of 6 (224 Views)

Re: Shape Factor

09-13-2011 03:40 PM in reply to: kdave

Review Dimenionless Unit Hydrograph.  The Standard 484 is pretty typical, but there are other pre-defined values available



Matthew Anderson, PE
Product Manager
ICP
Autodesk, Inc.

Contributor
kdave
Posts: 19
Registered: ‎09-13-2011
Message 3 of 6 (211 Views)

Re: Shape Factor

09-14-2011 06:06 AM in reply to: Matt.Anderson

Thanks Matt..!

Member
Posts: 4
Registered: ‎06-27-2012
Message 4 of 6 (164 Views)

Re: Shape Factor

06-27-2012 06:03 AM in reply to: Matt.Anderson

I am not able to find out which shape factor the program is using.  Where do you find that information?  Can it be changed/selected?

WaltBPE
Employee
Matt.Anderson
Posts: 2,901
Registered: ‎05-13-2005
Message 5 of 6 (156 Views)

Re: Shape Factor

06-28-2012 05:13 AM in reply to: kdave

Walter -

 

Change the Hydrology Engine to TR-20 and review the Dimensionless Unit Hydrograph. 484.png

 

The Standard 484 Shape factor is the SCS Unit Hydrograph. 



Matthew Anderson, PE
Product Manager
ICP
Autodesk, Inc.

Member
Posts: 4
Registered: ‎06-27-2012
Message 6 of 6 (152 Views)

Re: Shape Factor

06-28-2012 01:54 PM in reply to: Matt.Anderson

Thank you.

 

It would be nice if the shape factor input was placed with the rainfall selection criteria rather than by tself.

WaltBPE

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