Areas subject to inundation by the 1-percent-annual-chance flood event generally determined using approximate methodologies. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.
National Flood Insurance Program (NFIP) Requirement
- Managing Floodplain Development in Approximate Zone A Areas (FEMA 265)
- Answers to Questions About the National Flood Insurance Program - Flood Hazard Assessments and Mapping Requirements (page 29)
- IS-9 Managing Floodplain Development Through The National Flood Insurance Program (NFIP) (page 3-33) (PDF 8MB, TXT 1MB) (entire document)