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Culvert Modeling in HEC-HMS

Culvert Modeling in HEC-HMS

Culvert Modeling in HEC-HMS

(OP)
I am having trouble modeling a culvert in HEC-HMS.  I am using version 3.01.  I tried version 3.4 but it had several bugs.

I have a watershed broken into two sections, seperated by a canal.  There is a culvert under the canal.  Basically, I want to model the contribution from the upper watershed as a truncated, flat top hydrograph, with the flat portion the peak culvert capacity.  I thought this might be easiest to do as a Source (in which case I would run the upper watershed model seperately, and get data for a hydrograph and input it into the source), but I am having trouble linking the source upstream of the other watershed.  I also want to do some channel routing, probably just using the Lag method.

Any suggestions on the best way to do this?

RE: Culvert Modeling in HEC-HMS

I would probably use another program as Hydro Culv or HY-8.
Keeping HMS to estimate the peak flow at the culvert inlet.
You could use HEC RAS to model the reach with the culvert on it.

lower watershed? A sketch maybe?

RE: Culvert Modeling in HEC-HMS

Route the watershed entering the culvert to a diversion element.  The diversion element can be defined with a Qin per Qout table that may look like:

Qin     Qout
0          0
X          X
99999    X

Where X is the maximum culvert capacity and 99999 is some number larger than the expected peak runoff rate.  Outflow from the diversion element will match the runoff hydrograph up to a maximum discharge of X.  Everything else will be diverted.  From the diversion element, both the outflow and diverted flow can be routed downstream separately.   

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