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HY-8 and Multiple Culverts

HY-8 and Multiple Culverts

HY-8 and Multiple Culverts

(OP)
I am getting an odd error in HY-8 when analyzing multiple culverts.

My situation is this - a new road crossing, with two arch RCP pipes.  The first is a 62x102 with the invert buried into the stream bed 12".  The second pipe is a 54x88 with the invert at the stream bed elevation.  When running the analysis, I get two different headwater elevations, and most of the flow is routed through the smaller culvert, and the roadway overtops.  

When I check the design flow for a similar condition in Hydraflow Express, I get adequate freeboard and no overtopping.  Any ideas?  I have attached the file in question.

RE: HY-8 and Multiple Culverts

(OP)
Update on this post.  I created a new HY-8 file and entered the data anew.  This time, I get the same W.S.E. for both culverts.  Now it appears to work.

I stumbled upon a similar post here from 10/2008 where the user had the same problem.  Perhaps an odd glitch in the coding?

Thanks in advance to anybody who might have responded.

RE: HY-8 and Multiple Culverts

Are you using the latest version? The previous version of HY8 definitely had a few glitches.  

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