I could see putting the bank stations at the OHWM if I were modeling a smaller storm event; however, this was for a 100 year storm, which was (probably not coincidentally) just barely contained in the channel. After my initial post, I did a little more research into the RAS calculations and...
I'm having to model a roadside ditch to satisfy a reviewer for a proposed culvert. I've been told by the reviewer that "The channel bank stations should be at the Ordinary High Water Mark, not at the top of bank" (which is how I've always done it). In essence, moving the Bank Stations from the...
That seems to be a standard comment on their first review letter. Make sure to talk to your reviewer, they may waive the requirement. I've gotten out of creating the duplicate (and/or corrected) effective model after explaining to the reviewer that I don't have accurate topo from 10-20 years...
I think I had this problem before.
Try opening the RUN file in notepad. In there are lines referencing the location of the DSS file. Try changing the pathname for those.
There was a CLOMR, but it was only for lining part of the channel with concrete. Since then, the City took over the project, extended the concrete channel, some box culvert modifications... Enough so that the previous CLOMR was useless.
Next Question.... Wasted numerous hours until I finally...
It's an existing road crossing, so can't extend the box. I'm now in charge of doing the LOMR that the previous administration should have done 3 years ago.
So, I'm going through RAS and doing the Method 4 & 5 Encroachment method to define my floodway. Everything is going fine for the first 3500 feet, until I get to the first cross section after it changes from concrete (upstream) to an earthen channel (also the first XSec after box culvert)...
This is an old existing residential neighborhood that had a lot of flooding problems. The Corps put in a detention basin upstream which relieved some of the problems. A consultant completed the LOMR for that project.
Recently, the City recently went in and upsized some box culverts which were...
It's residential subdivision with approximately 200 houses. Not really an option to model them as blocked obstructions.
It would either require me to have cross-sections every 40-50', which would be overkill. Or it would have blocked obstruction throughout the entire overbank, which would...
I have a channel running through a residential subdivision. Just wondering how you model houses in the overbanks.
I've seen two separate ways. One is using a little higher n value of 0.07 in the overbanks and using ineffective flow areas (for the storage, but essentially no conveyance). The...
