Update: Frenchman Fire in Los Angeles County progresses to 85% containment
Briefly

"Containment indicates what percentage of the fire perimeter has been surrounded by a control line. In this case, it means that 85% of the wildfire is contained from spreading, while 15% is still uncontrolled."
"Containment is part of a larger plan for managing a wildfire. It is normally expressed as a percentage and it refers to how much of the fire perimeter has been surrounded/enclosed by a control line that firefighters create."
"The incident's central command constantly receives progress reports from firefighters on the ground. As the fireline is constructed, inspected or reinforced, mappers record those details to adjust the containment percentage."
Read at Sacramento Bee
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