Image is from page 29 of the Federal Emergency Agency's "Guidance for Flood Risk Analysis and Mapping, Flood Depth and Analysis Grids", February 2018. Document is available at https://www.fema.gov/media-library-data/1523562952942-4c54fdae20779bb004857f1915236e6c/Flood_Depth_and_Analysis_Grids_Guidance_Feb_2018.pdf Hovering over the image in the PDF documents caused a popup window that says, "An example of the percent annual chance of flooding over a 30-yr period grid is shown, with reds and oranges representing areas more likely to flood, and yellows and greens representing areas less likely to flood over a 30-yr time period."

	This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Federal Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse