HEC-RAS Version Difference
HEC-RAS Version Difference
(OP)
Hello,
I acquired HEC-RAS input from FEMA. The version that was used to calculate the floodways and natural flow values was HEC-RAS V. 2.2. We are currently using HEC-RAS V4.1. When we run the FEMA input our water surface elevations for the the floodways are off by at least 0.5 ft or more. Are there computational differences between 2.2 and 4.1 when using encroachments. Also does anyone know where to get the all the release notes for the HEC-RAS programs?
Thank you
I acquired HEC-RAS input from FEMA. The version that was used to calculate the floodways and natural flow values was HEC-RAS V. 2.2. We are currently using HEC-RAS V4.1. When we run the FEMA input our water surface elevations for the the floodways are off by at least 0.5 ft or more. Are there computational differences between 2.2 and 4.1 when using encroachments. Also does anyone know where to get the all the release notes for the HEC-RAS programs?
Thank you





RE: HEC-RAS Version Difference
If you're submitting to FEMA for something like a CLOMR, you should by rights be able to run the old 2.2 model in 4.1, and then use the 4.1 elevations as your "corrected effective" elevations to match against.
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: HEC-RAS Version Difference
http://www.hec.usace.army.mil/software/hec-ras/dow...
RE: HEC-RAS Version Difference
RE: HEC-RAS Version Difference
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com