The wildland–urban interface (WUI) is a zone of transition between wilderness (unoccupied land) and land developed by human activity – an area where a built environment meets or intermingles with a natural environment. Human settlements in the WUI are at a greater risk of catastrophic wildfire.DefinitionsIn the United States, the wildland–urban interface (WUI) has two definitions. The US Forest Service defines the wildland–urban interface qualitatively as a place where "humans and their development meet or intermix with wildland fuel." Communities that are within of the zone are included. A quantitative definition is provided by the Federal Register, which defines WUI areas as those containing at least one housing unit per .The Federal Register definition splits the WUI into two categories based on vegetation density:
Intermix WUI, or lands that contain at least one housing unit per in which vegetation occupies more than 50% of terrestrial area; a heavily vegetat
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