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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

Attributes Range Median Mean Standard Deviation
Perimeter 204.76 - 2392460.00 4002.54 24459.44 125181.11

Perimeter

Flood Area ID Text column (no statistics available)

Flood Area ID

Depth Revert -9999.00 - -9999.00 -9999.00 -9999.00 0.00

Flood Depth For Reverted Zone

Base Flood Elevation (Reverted Zone) -9999.00 - -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 - 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 - -9999.00 -9999.00 -9999.00 0.00

Velocity Measurement

Length Unit Text column (no statistics available)

Length Units

Depth -9999.00 - -9999.00 -9999.00 -9999.00 0.00

Depth Value for Zone AO Areas

Static Bfe -9999.00 - 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