HEC-RAS Culvert with obstruction
HEC-RAS Culvert with obstruction
(OP)
I am interested in using HEC-RAS to calculate the water surface and flows through a 60' long, 7' x 14' arch culvert pipe with a 3' wide 14" high sidewalk obstruction located in a portion of the pipe.
I have routed the stormwater runoff from the 500 acre watershed area through the existing 7' x 14' arch culvert pipe and calculated the pre-existing flows and water surface elevation for 10, 25, 50 and 100 year storm.
My question is how can you place an obstruction inside a culvert? It appears HEC-RAS will not let you do this.
I have routed the stormwater runoff from the 500 acre watershed area through the existing 7' x 14' arch culvert pipe and calculated the pre-existing flows and water surface elevation for 10, 25, 50 and 100 year storm.
My question is how can you place an obstruction inside a culvert? It appears HEC-RAS will not let you do this.





RE: HEC-RAS Culvert with obstruction
RE: HEC-RAS Culvert with obstruction
RE: HEC-RAS Culvert with obstruction
You may also be able to define your high/low chords to fit your needs or perhaps even use blocked obstruction in the upstream and downstream culvert sections.
Good luck!
RE: HEC-RAS Culvert with obstruction
RE: HEC-RAS Culvert with obstruction
The problem I experienced by modeling it as a bridge was that an error occured "Station data is not in increasing order, stationing needs to maintain (vertical walls) or increase. Any ideas how to get around this?
RE: HEC-RAS Culvert with obstruction
HEC-Ras although a great program isn't really set up to do what you are looking for.
Hope this helps.
RE: HEC-RAS Culvert with obstruction
RE: HEC-RAS Culvert with obstruction
The RAS Team had replied back to me and instructed me how to perform this study. They said use the ground line to account for the channel and top of sidewalk. Use the deck to account for the arch.