One of the first steps in creating a HEC-RAS model is to set the projection in RAS Mapper. Here is a great video by Vox explaining why we need projection files:
A very comprehensive online repository for downloading free projection files is www.spatialreference.org:
Download our Workshop #1 pdf file to step through the process of setting up the projection in RAS Mapper.
Need help setting up, reviewing, or troubleshooting flood models? We also offer drainage designs, surface water management plans, flood mapping, impact assessment, flood mitigation, hydraulics structures design, QA/QC, and more. See our consulting services for details or book consulting hours.
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