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HY-8 multiple culverts

HY-8 multiple culverts

HY-8 multiple culverts

(OP)
I was wondering if anyone might have an explanation for varying HY-8 results depending on how one models multiple culverts (I am using the latest release v7.1).

I am simply modeling 2 identical parrallel culverts.  One option is to set the "Number of Barrels" in the culvert properties to 2.

At one point I wished to check some alternatives with varying the inverts of the second culvert.  So I took the second approach of having 2 culvert definitions for the one crossing.  Using this approach, setting all properties identical for both culverts yeilds a different headwater for the same flows than using a single culvert definition with 2 barrels.

I have attached the file in question for those interested.

Any ideas?

RE: HY-8 multiple culverts

according to my computer, headwater is  the same - 20.63 for 158 cfs design flow on both crossings.  I can't see a difference.   

RE: HY-8 multiple culverts

(OP)
Thanks CVG, I opened the file again here and get 21.60 for both.  I swear it was not the case the day I sent this.  Although, I would be unlikely to believe it if someone else was stating the same.

I was abount to post this, then tried one more thing.  When I opened the file from HY-8, the headwaters agree.  When I launch HY-8 by double clicking the data file in Windows Explorer, I get 21.60 for the doubld barrel, but get 21.10 with the two culvert definitions.  It seems something does not get initialized when launching from Explorer.

RE: HY-8 multiple culverts

yep, its the same for me as well! anyway, good that you have it figured out now..

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