AutoCAD Civil 3D - Stormwater

[#1]

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

[#2 · Accepted solution]

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

[#3]

Thanks Matt..!

[#4]

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?

[#5]

Walter -

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

The Standard 484 Shape factor is the SCS Unit Hydrograph. 

[#6]

Thank you.

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