Special Flood Hazard Areas

Special Flood Hazard Areas (SFHAs) are areas of land that are subject to flooding from a storm with 1% chance of occurring annually, also known as the 100-year floodplain. Credits: FEMA National Flood Hazard Layer (NFHL), June 2026.特殊洪水危险区（Special Flood Hazard Areas，SFHAs）指易遭受每年发生概率为1%的风暴引发的洪水影响的陆地区域，该区域亦被称为百年一遇洪水泛区。数据来源：美国联邦紧急事务管理局（Federal Emergency Management Agency, FEMA）国家洪水灾害图层（National Flood Hazard Layer, NFHL），2026年6月。