500-year floodplain

'500-year floodplain' is the everyday name for FEMA's Moderate Risk Flood Hazard Area — the band of land beyond the Special Flood Hazard Area with a lower, but non-zero, annual chance of flooding. It carries less regulatory weight than the 100-year floodplain: no federal flood-insurance mandate attaches to it, and construction standards are lighter. New York's flood-disclosure statutes still ask about it directly — the amended Property Condition Disclosure Statement and the residential-lease flood notice both require sellers and landlords to state whether a property sits wholly or partly within the moderate-risk zone.

Reading a 500-year designation honestly means treating it as real, if lower-probability, exposure rather than as a synonym for 'safe.' A property just outside the Special Flood Hazard Area and inside the moderate-risk band sits on a gradient, not off a cliff — and its flood-loss history and elevation relative to the base flood tell the more decision-relevant story than the zone label alone.