What Goes into a Flood Map: Infographic

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FEMA's Tom Pickering discusses flood maps with one of the people who attended an Open House on flood maps in Jefferson Parish. Jacqueline Chandler/FEMA

Helping homeowners and communities know their risk of being impacted by disasters stands as one of our top priorities at FEMA. When you know your risk, you can prepare for the worst, take steps to mitigate against hazards, and protect yourself, your family and your property.

Year to year, flooding is the most costly disaster in America. Flood maps play a vital role in helping us prepare for flooding by informing communities about the local flood risk. Flood maps help communities to incorporate flood risk into their planning. They’re also the basis for flood insurance rates through the National Flood Insurance Program, which FEMA administers at the direction of Congress. By law, you may be required to get flood insurance if you live in the highest risk areas. But flooding can happen anywhere -- about 20 percent of all the flood claims come from areas with lower risk. And you don’t have to live close to water to be at risk.

The process for developing and updating flood maps is a long one – and for good reason. It allows communities and property owners at all steps of the process to incorporate the best available data into each community’s flood maps. Projects typically take from 3-5 years to complete, but sometimes they can take longer.  Through the Risk MAP program, flood maps are developed using the best available science, analyzed by some of the leading engineering firms in the field. The mapping standards are published, vetted, have been peer reviewed, and are updated continuously to ensure they are aligned with current best practices.

The infographic below gives you an overview of all that goes into a flood map from beginning to end. The more that communities and homeowners know about this process, the better we can work together to make sure that we build safely and resiliently and are prepared for flooding and other natural disasters.

For full text of the infographic below, visit our document library.

Graphic explaining what a flood map is, how they are made, who works on them, how flood risk is reviewed, and how the public can appeal a flood map decision. For full text of this image, visit http://www.fema.gov/media-library/assets/documents/91087.

Last Updated: 
03/04/2014 - 13:50
Posted on Fri, 02/21/2014 - 17:33
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