FIMA manages the National Flood Insurance Program (NFIP) and a range of programs designed to reduce future losses to homes, businesses, schools, public buildings, and critical facilities from floods, earthquakes, tornadoes, and other natural disasters. http://www.fema.gov/what-mitigation/federal-insurance-mitigation-administration
Data developed by the Federal Emergency Management Agency (FEMA) with information from its Digital Flood Insurance Rate Map (DFIRM) Database, capturing flood risk information and supporting data for Philadelphia County. Data consists of geo-referenced digital maps and attribute data. Risk classifications used in the data are: 1% annual-chance flood event; 0.2% annual-chance flood event; and areas of minimal flood risk.