The National Weather Service, in coordination with FEMA, has recently added the option to display FEMA Flood Hazard Layers on top of AHPS river gage maps. The goal of this enhanced service is to increase flood risk awareness in and around your community.
"Through its Flood Hazard Mapping Program, FEMA identifies flood hazards, assesses flood risks and partners with states and communities to provide accurate flood hazard and risk data to guide them to mitigation actions. Flood Hazard Mapping is an important part of the National Flood Insurance Program, as it is the basis of the NFIP regulations and flood insurance requirements. FEMA maintains and updates data through Flood Insurance Rate Maps (FIRMs) and risk assessments. FIRMs include statistical information such as data for river flow, storm tides, hydrologic/hydraulic analyses and rainfall and topographic surveys. FEMA uses the best available technical data to create the flood hazard maps that outline your community’s different flood risk areas."
Below is an example showing the flood hazard layers for the Sangamon River at Petersburg.
NOTE: The flood hazard layers will only be visible at zoom levels between 14 and 16. Not all areas of the country will have flood hazard layers defined. However, if these currently unmapped areas are defined in the future then they will appear on AHPS automatically. Also, not all areas with these layers will have the 0.2% risk and floodway areas delineated.
The National Weather Service is happy to work with FEMA in making flood risk areas in your community better known.