Figure S-1 Flood Hazards
ABOUT THE MAP. This map shows the approximate location and extent of flood hazards as determined by FEMA Flood Insurance Rate Maps. Homes built within 100-year flood zones are required to purchase flood insurance. While regional and local stormwater drainage channels have largely mitigated flood risks in Santa Ana, severe weather may still have a substantial impact on the areas protected by channels or in a 500-year flood zone.