FEMA model

[Charles Wu]

Hi All,
I tried to download FEMA floodplain model from FEMA website, and intend to input these data to HEC-RAS. We especially need the elevations and geometry from different cross-sections. However, the GIS data I downloaded from NFHL website seems to be polylines without the elevation values. My question is did I miss something? or should I pay for the data? I am new to FEMA model, so hope anyone who is familiar to the model can let me know.
Thank you!

[Jake G]

Hi Charles,

In most cases, you need to order the FEMA backup data from the FEMA Engineering Library in order to get the FEMA model (cost is in the $400 range). They recently putting some recent models online, but that won’t apply to most situations yet. Also note that you can order the data and pay the money, but they find nothing in their archives–happens all the time.

Good luck,
Jake G.

[Jake G]

Forgot to add the FEMA link: https://www.fema.gov/how-order-technical-administrative-support-data

– Jake G.

[Charles Wu]

Thank you!

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