Concept

Wildland–urban interface

Summary
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. Definitions In 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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