Previously I did a tutorial video on how to do mapping for Flood Response. This is the prequel to that video showing where you can get the data and how to proceed.

The next part to this is here:
   • Flood Response Mapping on ArcGIS 10.3  

Pardon me for all the times i said Shapefile instead of shape or polygon in the last part and my bad narration.

I would be glad to answer any questions you might have.

Thanks. Cheers. Enjoy.