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DIGITAL FLOOD INSURANCE RATE
MAPS (DFIRM) 2017 |
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LAYER: FIRMVC_POLY_092917 |
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DIRECTORY: AEDATA/PublicSafety/firmvc_poly_092917.shp |
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DIRECTORY: Volusia.SDE/PublicSafety/firmvc_poly_092917 |
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TYPE: POLYGON |
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Shapefile is downloadable from http://maps.vcgov.org/gis/download/shapes.htm. |
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These
maps do not necessarily show all areas potentially subject to flooding in the
county, and should be used as a general guide only. Any discrepancies or
errors should be reported to the Volusia County GIS Department. Description: |
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Update Frequency: Latest update for portions of the County incorporated
into this layer became effective 092917. |
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Spatial Domain |
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Extent |
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Spatial Data Information |
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Data Type: |
digital map |
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Data Format: |
SDE Feature Class |
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Data Projection: |
NAD_1983_HARN_StatePlane_Florida_East_FIPS_0901_Feet |
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FIELDS |
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NAME |
DESCRIPTION |
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EFF_DATE |
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FLD_ZONE |
Flood
Zone. This is a flood zone designation. These zones are used by FEMA to
designate the SFHAs (Special Flood Hazard Areas) and for insurance rating
purposes. NOTE: The symbol '%' is a reserved symbol in most software packages
so the word 'percent' was abbreviated to 'PCT'. Acceptable values for this
field are listed in the Zone Description table. (See Table Below for Descriptions) |
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FLOODWAY |
Floodway
Type. Floodway areas are designated by FEMA and adopted by communities to provide
an area that will remain free of development to moderate increases in flood
heights due to encroachment on the floodplain. Normal floodway areas are
'floodway'. Special cases will have a note on the hardcopy FIRM. If the
corresponding area is not designated as a floodway, this field is null.
Acceptable values for this field are listed in the D_Floodway
table. |
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SFHA_TF |
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STATIC_BFE |
Static
Base Flood Elevation. For areas of constant Base Flood Elevation (BFE), the
BFE value is shown beneath the zone label rather than on a BFE line. In this
situation the same BFE applies to the entire polygon. This is normally occurs
in lakes or coastal zones. This field is only populated where a static BFE is
shown on the FIRM. |
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V_DATUM |
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DEPTH |
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LEN_UNIT |
Length Units. This unit indicates the
measurement system used for the BFEs and/or depths. Normally this would be
feet. This field is only populated if the STATIC_BFE or DEPTH field is
populated. Acceptable values for this field are listed in the D_Length_Units table. |
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VELOCITY |
Velocity Measurement. This is shown beneath
the zone label on the FIRM for alluvial fan areas (certain Zone AO areas).
This value represents the velocity of the flood flow in this area. This field
is only populated when a velocity is shown on the FIRM. |
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VEL_UNIT |
Unit
of Measurement for the Velocity Attribute. This is shown in the legend where
alluvial fans are present. This field is only populated if the VELOCITY field
is populated. Acceptable values for this field are listed in the D_Velocity_Units table. |
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AR_REVERT |
If
the area is Zone AR, this field would hold the zone that the area would
revert to if the AR zone were removed. This field is only populated if the
corresponding area is Zone AR. Acceptable values for this field are listed in
the D_Zone table. |
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BFE_REVERT |
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DEP_REVERT |
If
Zone is Zone AR, this field would hold that flood depth for the reverted
zone. This field is populated when Zone equals AR and the reverted zone has a
depth assigned. |
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SOURCE_C_1 |
Source
Citation. Abbreviation used in the metadata file when describing the source
information for the S_Fld_Haz_Ar table. Normally,
the flood hazard area polygon will be divided to distinguish areas modified
by the most recent revision from areas based on the effective FIRM prior to
the most recent revision. Revisions and sources prior to the most recent
revision will not be tracked for individual polygons in the flood hazard
areas table in the standard database. |
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ACRES |
Polygon acreage. |
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CODE
DESCRIPTIONS
ZONE |
DESCRIPTION |
SPECIAL FLOOD HAZARD AREAS INUNDATED BY 100-YEAR FLOOD |
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A |
Zone
A is the flood insurance rate zone that corresponds to the 1-percent annual
chance floodplains that are determined in the Flood Insurance Study by
approximate methods of analysis. Because detailed hydraulic analyses are not
performed for such areas, no Base Flood Elevations or depths are shown within
this zone. Mandatory flood insurance purchase requirements apply. |
AE and A1-A30 |
Zones
AE and A1-A30 are the flood insurance rate zones that correspond to the
1-percent annual chance floodplains that are determined in the Flood
Insurance Study by detailed methods of analysis. In most instances, Base
Flood Elevations derived from the detailed hydraulic analyses are shown at
selected intervals within this zone. Mandatory flood insurance purchase
requirements apply. |
AH |
Zone
AH is the flood insurance rate zone that corresponds to the areas of
1-percent annual chance shallow flooding with a constant water-surface
elevation (usually areas of ponding) where average depths are between 1 and 3
feet. The Base Flood Elevations derived from the detailed hydraulic analyses
are shown at selected intervals within this zone. Mandatory flood insurance
purchase requirements apply. |
AO |
Zone
AO is the flood insurance rate zone that corresponds to the areas of
1-percent shallow flooding (usually sheet flow on sloping terrain) where
average depths are between 1 and 3 feet. Average flood depths derived from
the detailed hydraulic analyses are shown within this zone. In addition,
alluvial fan flood hazards are shown as Zone AO on the Flood Insurance Rate
Map. Mandatory flood insurance purchase requirements apply. |
AR |
Zone
AR is the flood insurance rate zone used to depict areas protected from flood
hazards by flood control structures, such as a levee, that are being
restored. FEMA will consider using the Zone AR designation for a community if
the flood protection system has been deemed restorable by a Federal agency in
consultation with a local project sponsor; a minimum level of flood
protection is still provided to the community by the system; and restoration
of the flood protection system is scheduled to begin within a designated time
period and in accordance with a progress plan negotiated between the
community and FEMA. Mandatory purchase requirements for flood insurance will
apply in Zone AR, but the rate will not exceed the rate for an unnumbered
Zone A if the structure is built in compliance with Zone AR floodplain
management regulations. |
A99 |
Zone
A99 is the flood insurance rate zone that corresponds to areas within the 1-percent
annual chance floodplain that will be protected by a Federal flood protection
system where construction has reached specified statutory milestones. No Base
Flood Elevations or depths are shown within this zone. Mandatory flood
insurance purchase requirements apply. |
D |
The
Zone D designation is used for areas where there are possible but
undetermined flood hazards. In areas designated as Zone D, no analysis of
flood hazards has been conducted. Mandatory flood insurance purchase
requirements do not apply, but coverage is available. The flood insurance
rates for properties in Zone D are commensurate with the uncertainty of the
flood risk. |
V |
Zone
V is the flood insurance rate zone that corresponds to areas within the
1-percent annual chance coastal floodplains that have additional hazards
associated with storm waves. Because approximate hydraulic analyses are
performed for such areas, no Base Flood Elevations are shown within this
zone. Mandatory flood insurance purchase requirements apply. |
VE |
Zone
VE is the flood insurance rate zone that corresponds to areas within the
1-percent annual chance coastal floodplain that have additional hazards
associated with storm waves. Base Flood Elevations derived from the detailed
hydraulic analyses are shown at selected intervals within this zone.
Mandatory flood insurance purchase requirements apply. |
OTHER FLOOD AREAS |
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B, C, and X |
Zones
B, C, and X are the flood insurance rate zones that correspond to areas outside
the 1-percent annual chance floodplain, areas of 1-percent annual chance
sheet flow flooding where average depths are less than 1 foot, areas of
1-percent annual chance stream flooding where the contributing drainage area
is less than 1 square mile, or areas protected from the 1-percent annual
chance flood by levees. No Base Flood Elevations or depths are shown within
this zone. Insurance purchase is not required in these zones. |
0.2
PCT ANNUAL CHANCE FLOOD HAZARD |
Areas with a 0.2% annual chance of flooding
(500 year). |