The purpose of this page is to define Zone AH, a commonly used term in floodplain management.
Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are between one and three feet. Base Flood Elevations (BFEs) derived from detailed hydraulic analyses are shown in this zone. Mandatory flood insurance purchase requirements and floodplain management standards apply.
- Answers to Questions About the National Flood Insurance Program - Flood Insurance Assesments and Mapping Requirements
- IS-9 Managing Floodplain Development Through The National Flood Insurance Program (NFIP) (page 3-33)