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Quick update: We consulted with the local floodplain official, who ran around trying to figure out why he didn't know about the revised map. He has placed the property under violation of their ordinance, pending an H&H study to determine the impact of the encroachment. If a study reveals no...

Was able to get in touch with them after posting. They recommended taking it to the local floodplain and building officials to see how they wanted to handle it, seeing as it was a slip-up on their part in the first place by issuing a building permit for a building located in a floodway. The...

I have been asked to submit a LOMR-F for a development that has been completed in a flood zone. The property used to be in an unstudied A-Zone, but apparently there was a detailed study done for another project that affected this property, defining a floodway and BFE's. This development was...

Thanks for the advice, that seems like it should make sense to the reviewer. We are submitting for a CLOMR now, so we have our own proposed maps of new floodplain/way limits. Once that is approved and the project is built and we submit for a LOMR, how does FEMA go about getting the actual map...

This project is my first formal submittal to FEMA so I'm not sure how they handle this. When I run check-ras it gives me a message describing how it is inappropriate to model a junction unless certain criteria are met (my reaches don't meet the criteria). It says the reaches should be modeled...

I know most people are not fond of Check RAS, but when I run it with my floodway profiles, I get a message at the x-sections where the encroachment is within the effective flow area. Check RAS is saying that a floodway encroachment shouldn't be allowed any closer in than an ineffective flow...

Perfect, that's it! Thanks

Anyone know where I can find information regarding 500yr rainfall depths in the southeast? Everywhere I look only provides info up to the 100yr storm. I'm analyzing a stream in HEC-RAS where I'm going further upstream than the established FEMA map, so I have to come up with the flows to my...

For the last cross-section upstream of a bridge or culvert crossing, what should the downstream reach length be? Currently I am saying that the length is the distance to the next cross-section, which is downstream of the bridge/culvert. Is this correct, or should the length be the distance to...

I'm trying to run check-ras for the first time, and getting an error message when I try to extract the data from the report generated in Hec-Ras. I found the FEMA website's additional information on this error (attached below), but it still doesn't work. Anyone have any advice or had the same...

That did it! I had one downstream cross-section whose bottom elevation was blocking a portion of the culvert. I also adjusted the encroachment and cross section stationing to make sure it didn't block what the culvert stations were at, and immediately got more reasonable results. I now have...

Thanks for all the help, attached are the site plan and report, I included some output info and error messages as well. I'm glad to hear about the schematic and perspective plots, it made sense that it shouldn't matter but it still had me...

I think I have attached the full model, a zip file with the geometry, flow, plan, and project files. The plan file uses encroachment method 1 (imported from method 4), but I get the same results regardless of encroachment method. Culvert geometry appears to make sense, and the 100 yr flood is...

Hey All, I am modeling a stream in HEC-RAS that crosses under a large 4 lane highway with dual 8'x10' box culverts, and then further upstream crosses a dirt road with an old masonry arch bridge. The stream has been modeled by FEMA before, but since then the stream has been realigned. The...