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Flood Management

Types of Floodplain Maps


The following is a list of major floodplain mapping products developed by Federal Emergency Management Agency (FEMA) and California Department Water Resources (DWR).

  • FEMA Flood Insurance Rate Maps (FIRM): FIRMs represent flood hazard areas for floodplains of 1% (100-year) and 0.2% (500-year) chance of annual occurrence. These maps are only available via large paper copies.
  • FEMA Digital Q3 Flood Data: Q3 Flood Data is a digital representation of certain features of Flood Insurance Rate Maps (FIRM), intended for use with desktop mapping and Geographic Information Systems (GIS) technology.
  • FEMA Digital Flood Insurance Rate Maps (DFIRM): Digital Flood Insurance Rate Maps represent GIS-based mapping products of Flood Insurance Rate Maps (FIRMs) and Q3 Flood Data developed as a part of FEMA Flood Map Modernization (Map Mod) program.
  • DWR Levee Flood Protection Zone (LFPZ) Maps: LFPZ maps represent floodplain areas protected by Central Valley State-Federal Project Levees. These maps were developed based on the best available information as required by Assembly Bill 156.
  • DWR Best Available Maps (BAM): Best Available Maps (BAM) represent the 100- and 200-year composite floodplains located within the Sacramento-San Joaquin Valley watershed. These maps were developed based on the best available information as required by Senate Bill 5.
  • DWR Awareness Floodplain Maps: Awareness Floodplain Maps display the 100-year flood hazard areas using approximate assessment procedures. These floodplains will be shown simply as flood prone areas without specific depths.
  • DWR Central Valley Floodplain Evaluation and Delineation (CVFED) Maps: CVFED maps represent 100- and 200-year floodplains for urban and urbanizing areas within the Sacramento-San Joaquin Valley watershed. These maps will be developed based on more detailed hydrologic and hydraulic information, topographic data, and levee evaluations. These maps are required by Senate Bill 5.