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.
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
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