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On FEMA map in Zone AE, what does "2.5' depth criterion applies" mean?

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AskTooMuch

AskTooMuch

Petroleum
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Jan 26, 2019
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I tried googling but not going anywhere.
Does it mean minimum of structure floor must be 2.5' above BFE of Zone AE?
I'm just looking at some properties not designing anything.
 
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first (habitable) floor must be above the 100-year floodplain elevation. the floodplain manager or the building department may have other requirements.
 
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