What do the different flood zones mean?

Click Here for Definitions of FEMA Flood Zone Designations

The following table gives an explanation for the flood zone designations
used by First American Flood Data Services:

BFE = Base Flood Zone Elevation

Zone

Zone Name

Description

100

Area in SFHA

This is an area inundated by 100-year flooding for which BFEs or velocity may have been determined. No distinctions are made between the different flood hazard zones that may be included within the SFHA.

100IC

100-year Flood Discharge Contained in Channel

An area where the 100-year flooding is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown.

A

Zone A

An area inundated by 100 year flooding, for which no BFEs have been established.

A99

Zone A99

An area inundated by 100-year flooding, for which no BFEs have been determined. This is an area to be protected from the 100-year flood by a Federal flood protection system under construction.

AE

Zone AE

An area inundated by 100-year flooding, for which BFEs have been determined.

AH

Zone AH

An area inundated by 100-year flooding (usually an area of ponding), for which BFEs have been determined; flood depths range from 1 to 3 feet.

ANI

Area Not Included

An area that is located within a community or county that is not mapped on any published FIRM.

AO

Zone O

An area inundated by 100-year flooding (usually sheet flow on sloping terrain), for which average depths have been determined; flood depths range from 1 to 3 feet.

AR

Zone AR

An area inundated by flooding, for which BFEs or average depths have been determined.

B

Zone B

An area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 100-year flooding.

BE

Zone BE

An area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 100-year flooding.

BX

Zone BX

An area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 100-year flooding.

C

Zone C

An area that is determined to be outside the 100- and 500-year floodplains.

CE

Zone CE

An area that is determined to be outside the 100- and 500-year floodplains.

CX

Zone CX

An area that is determined to be outside the 100- and 500-year floodplains.

D

Zone D

An area of undetermined but possible flood hazards.

FW

Floodway

An area that includes the channel of a river or other watercourse (Usually adjacent to Zone AE).

FWIC

Floodway Contained in Channel

An area where the floodway is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown. BFEs are not shown in this area, although they may be reflected on the corresponding profile

IN

Area In SFHA

This is an area inundated by 100-year flooding for which BFEs or velocity may have been determined. No distinctions are made between the different flood hazard zones that may be included within the SFHA.

NM

Area Not Mapped

An area that is located within a community or county that is not mapped on any published FIRM.

OUT

Area Not Mapped

An area designated as outside a "Special Flood Hazard Area" (or SFHA) on a FIRM. This is an area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile

UNDES

Area of Undesignated Flood Hazard

A body of open water, such as a pond, lake ocean, etc., located within a community's jurisdictional limits, that has no defined flood hazard.

V

Zone V

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

VE

Zone VE

An area inundated by 100-year flooding with velocity hazard (wave action); BFEs have been determined.

X

Zone X

An area that is determined to be outside the 100- and 500-year floodplains.

X5

Zone X (500-year)

An area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 100-year flooding.

X500

Zone X (500-year)

An area inundated by 500-year flooding; an area inundated by 100-year flooding with average depths of less than 1 foot or with drainage areas less than 1 square mile; or an area protected by levees from 100-year flooding.

X500IC

500-year Flood Discharge Contained in Channel

An area where the 500-year flooding is contained within the channel banks and the channel is too narrow to show to scale. An arbitrary channel width of 3 meters is shown.

A1

Zone A1

An area inundated by 100 year flooding, for which no BFEs have been established.

A2

Zone A2

An area inundated by 100 year flooding, for which no BFEs have been established.

A3

Zone A3

An area inundated by 100 year flooding, for which no BFEs have been established.

A4

Zone A4

An area inundated by 100 year flooding, for which no BFEs have been established.

A5

Zone A5

An area inundated by 100 year flooding, for which no BFEs have been established.

A6

Zone A6

An area inundated by 100 year flooding, for which no BFEs have been established.

A7

Zone A7

An area inundated by 100 year flooding, for which no BFEs have been established.

A8

Zone A8

An area inundated by 100 year flooding, for which no BFEs have been established.

A9

Zone A9

An area inundated by 100 year flooding, for which no BFEs have been established.

A10

Zone A10

An area inundated by 100 year flooding, for which no BFEs have been established.

A11

Zone A11

An area inundated by 100 year flooding, for which no BFEs have been established.

A12

Zone A12

An area inundated by 100 year flooding, for which no BFEs have been established.

A13

Zone A13

An area inundated by 100 year flooding, for which no BFEs have been established.

A14

Zone A14

An area inundated by 100 year flooding, for which no BFEs have been established.

A15

Zone A15

An area inundated by 100 year flooding, for which no BFEs have been established.

A16

Zone A16

An area inundated by 100 year flooding, for which no BFEs have been established.

A17

Zone A17

An area inundated by 100 year flooding, for which no BFEs have been established.

A18

Zone A18

An area inundated by 100 year flooding, for which no BFEs have been established.

A19

Zone A19

An area inundated by 100 year flooding, for which no BFEs have been established.

A20

Zone A20

An area inundated by 100 year flooding, for which no BFEs have been established.

A21

Zone A21

An area inundated by 100 year flooding, for which no BFEs have been established.

A22

Zone A22

An area inundated by 100 year flooding, for which no BFEs have been established.

A23

Zone A23

An area inundated by 100 year flooding, for which no BFEs have been established.

A24

Zone A24

An area inundated by 100 year flooding, for which no BFEs have been established.

A25

Zone A25

An area inundated by 100 year flooding, for which no BFEs have been established.

A26

Zone A26

An area inundated by 100 year flooding, for which no BFEs have been established.

A27

Zone A27

An area inundated by 100 year flooding, for which no BFEs have been established.

A28

Zone A28

An area inundated by 100 year flooding, for which no BFEs have been established.

A29

Zone A29

An area inundated by 100 year flooding, for which no BFEs have been established.

A30

Zone A30

An area inundated by 100 year flooding, for which no BFEs have been established.

V0

Zone V0

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V1

Zone V1

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V2

Zone V2

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V3

Zone V3

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V4

Zone V4

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V5

Zone V5

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V6

Zone V6

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V7

Zone V7

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V8

Zone V8

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V9

Zone V9

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V10

Zone V10

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V11

Zone V11

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V12

Zone V12

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V13

Zone V13

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V14

Zone V14

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V15

Zone V15

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V16

Zone V16

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V17

Zone V17

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V18

Zone V18

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V19

Zone V19

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V20

Zone V20

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V21

Zone V21

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V22

Zone V22

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V23

Zone V23

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V24

Zone V24

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V25

Zone V25

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V26

Zone V26

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V27

Zone V27

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V28

Zone V28

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V29

Zone V29

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

V30

Zone V30

An area inundated by 100-year flooding with velocity hazard (wave action); no BFEs have been determined.

Z

Area of Unknown Flood Hazard

An area of Data Discrepancy or an Unclaimed Area. Internal TFHC designation.

N

Area Not Mapped

An area that is located within a community or county that is not mapped on any published FIRM (Usually a community not participating in NFIP). Internal TFHC designation.

AR/A

Zone AR/A

An area inundated by flooding, for which BFEs or average depths have not been determined.

AR/AE

Zone AR/AE

An area inundated by flooding, for which BFEs or average depths have been determined.

AR/AE

Zone AR/AH

An area inundated by flooding, for which BFEs or average depths have been determined.