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how do you generate a hydrograph?

how do you generate a hydrograph?

how do you generate a hydrograph?

(OP)
Hi,
I was wondering what program do you use to generate a hydrograph. I just saw a hydrology report done by someone else and the person used Hydaflow Hydrographs Extension to design a detention basin. But the hydrgraph was manually input, so the engineer did not use Hydraflow to create the hydrograph. The hydrograph looked like a smooth bell curve. I think Hydraflow generates the triangular one. We use Modified Rational Method here in Southern California for smaller projects.

Do you have any idea which program was used, and where can I get it?

Thank you in advance!

RE: how do you generate a hydrograph?


Your local agency may have a specific Unit Hydrograph that is required for your location.  You may want to refer to the original drainage report or standard drainage manual.  I know that our state, county and city agencies all have unit hydrographs.  

RE: how do you generate a hydrograph?

Before you go screwing around with software, download this and read it cover to cover:

http://www.cpesc.org/reference/tr55.pdf

That should explain where the "bell shaped curve" hydrographs come from.


Then go here:

http://www.wsi.nrcs.usda.gov/products/w2q/h&h/Tools_Models/WinTR55.html

That software is basic and right from the horse's mouth.  After you understand how that stuff works, then move on to HEC-HMS or something similar.   

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com

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