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Digital Flood Insurance Rate Data for Johnson County, IA

"The Digital Flood Insurance Rate Map (DFIRM) 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 DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available." -- source: metadata

This section shows information about this dataset's attributes
Attributes Range Median Mean Std. Dev.
Perimeter
204.76  to  2392460.00
4002.54 24459.44 125181.11
Perimeter
Flood Area ID
  to 
Flood Area ID
Depth Revert
-9999.00  to  -9999.00
-9999.00 -9999.00 0.00
Flood Depth For Reverted Zone
Base Flood Elevation (Reverted Zone)
-9999.00  to  -9999.00
-9999.00 -9999.00 0.00
Static Base Flood Elevation for Reverted Zone
Source Citation Text column (no statistics available)
Source Citation
Vertical Datum Text column (no statistics available)
Vertical Datum
Flood Zone Text column (no statistics available)
Flood Zone (See Code Translation in Metadata)
Area
2199.68  to  6239100000.00
220305.00 31414271.87 309280339.08
Area
Area Revert Text column (no statistics available)
Area That Zone Would Revert To If AR Zone is Removed
Velocity
-9999.00  to  -9999.00
-9999.00 -9999.00 0.00
Velocity Measurement
Length Unit Text column (no statistics available)
Length Units
Depth
-9999.00  to  -9999.00
-9999.00 -9999.00 0.00
Depth Value for Zone AO Areas
Static Bfe
-9999.00  to  716.00
-9999.00 -9824.88 1354.92
Static Base Flood Elevation
Special Flood Hazard Text column (no statistics available)
Special Flood Hazard Area
Velocity Unit Text column (no statistics available)
Unit of Measurement for the Velocity Attribute
Floodway Text column (no statistics available)
Floodway Type