There are no flood maps that plan for this. Helene was not a 100 year flood by definition.
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Definitions of flood plans is based in rising water of current infrastructure stability. The USA, unlike the EU or UK, never accepted ANY definition of climate crisis. The petroleum industry has dominated government definitions and actions in the USA.
Helene was catastrophic flooding caused by a stalled climate crisis hurricane that through torrential rains caused the failure of mountainous terrain that clogged waterways creating unimaginable flooding. Nowhere in government definitions of flood maps/plains will anyone find the words climate crisis or complications of torrential rains from stalled storms. The language was never allowed.
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“What happened in Asheville” documents the complete alarm of Americans without a clue to the potential to the climate crisis because the language was never pursued. The corruption of the petroleum industry of the political system is why Asheville was devastated and so many lives lost. Americans were never told they had to give up burning fossil fuels to live on Earth. That is what happened in Asheville.