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New interactive climate map shows impact of heat, flooding in Fairfax County

Fairfax County’s interactive climate map shows heat and flooding conditions (via Office of Environmental and Energy Coordination)

As Fairfax County finalizes its first-ever plan to address the future effects of climate change, community members can see how the phenomenon already affects them with a newly released interactive map.

Launched last week, the climate map depicts heat and flooding data that can be viewed in conjunction with maps of the county’s population and infrastructure, including roads, utilities, and public facilities.

“The Fairfax County interactive climate map is a dynamic tool showcasing some of the best available data we have to date on climate impacts in our community,” Matt Meyers, the climate planning division director for the Fairfax County Office of Environmental and Energy Coordination, said. “The map is meant to inform and empower county residents, business owners, and community leaders to actively prepare for and participate in resilience efforts on a local level.”

The map offers a clear illustration of the heat island effect, showing that average daytime temperatures are higher in more populated and developed areas along major highways, like Tysons, Reston, the Fair Lakes and Fair Oaks area, and the Route 1 corridor.

Flooding appears to be most intense in the southeast part of the county, with waters from the Potomac River and Occoquan Bay overflowing onto Belle Haven, Lorton, Mason Neck, and Fort Belvoir. If sea levels rise a foot, Mason Neck will noticeably shrink. If they rise three feet, the Route 1 ramps to I-495 at the Alexandria border will be submerged.

Mason Neck with a 1-foot rise in sea level (via Office of Environmental and Energy Coordination)

The OEEC developed the map using information gathered through its Resilient Fairfax initiative, which started last year to establish a Climate Adaptation and Resilience Plan intended to reduce and prepare the county for the damages that will come with a rapidly warming Earth.

So far, the initiative has produced:

The Climate Adaptation and Resilience Plan will be finalized and presented to the Board of Supervisors for acceptance this fall, according to OEEC spokesperson Ali Althen.

The climate map uses the same data that went into the projections report and risk assessment, but it’s narrower in scope, focusing on current flood and heat information with some indicators of future conditions, such as “projected sea level rise and coastal storm surge,” the OEEC says.

With marginalized communities facing the most severe consequences from climate change, the map also incorporates data from the county’s Vulnerability Index, which scored different areas based on residents’ income, education, homeownership, and other socioeconomic factors.

The OEEC says it’s important for residents to understand what climate hazards are in store for the county so they can get involved in efforts to address those impacts. In Belle Haven, for instance, the U.S. Army Corps of Engineers has already proposed building a wall to mitigate flooding.

“Awareness is the first step toward climate readiness, and we hope this tool will allow users to grow in their understanding of the risks facing Fairfax County now and in the years to come,” Meyers said.

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