This data was pulled from static data downloaded from FEMA site (https://msc.fema.gov/portal/advanceSearch).  It is only the 100yr floodplain boundaries removed from the layer S_Fld_Haz_Ar within the geodatabase NFHL_51_20191011.gdb.  Selection query is SFHA_TF = "T".  Data was then exported to shapefile and generalized in ArcGISPro (Method: Simplify; Value, Max Allowable Offset = 25ft).

100yr Floodplain being defined as having a 1% chance of flooding within a calendar year.

From the FEMA Metadata:
The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.
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{'Title': '', 'Author': '', 'Comments': 'This data was pulled from static data downloaded from FEMA site (https://msc.fema.gov/portal/advanceSearch).  It is only the 100yr floodplain boundaries removed from the layer S_Fld_Haz_Ar within the geodatabase NFHL_51_20191011.gdb.  Selection query is SFHA_TF = "T".  Data was then exported to shapefile and generalized in ArcGISPro (Method: Simplify; Value, Max Allowable Offset = 25ft).\n\n100yr Floodplain being defined as having a 1% chance of flooding within a calendar year.\n\nFrom the FEMA Metadata:\nThe National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth\'s surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.', 'Subject': 'The boundaries for the 100 year floodplain in Virginia as definied by the Federal Emergency Management Agency.', 'Category': '', 'AntialiasingMode': 'None', 'TextAntialiasingMode': 'Force', 'Keywords': 'Virginia,Flood Data,100 year floodplain'}
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