Flood zone classification affects insurance, construction requirements, and lender terms.
Zone A (100-year, no BFE), Zone AE (100-year with BFE), Zone AH/AO (shallow flooding), Zone VE (coastal high hazard).
Zone X shaded (500-year), Zone X unshaded (minimal risk).
Zone AE: elevation requirements, flood-resistant construction, insurance ($10,000-$40,000+ premium per structure). Floodway vs flood fringe distinction.
LOMA, LOMR-F, and LOMR processes for incorrect mapping.