Federal Emergency Management Agency
20150223
FLOOD HAZARD ZONES OF THE DIGITAL FLOOD INSURANCE RATE MAP (DFIRM) IN THE STATE OF FLORIDA - FEBRUARY 2015
NFHL Florida Data Product ID: NFHL_12_20150223, Version 1.1.1.0
vector digital data
500 C Street SW, Washington, DC, 20472, US
Federal Emergency Management Agency
State of Florida
http://msc.fema.gov/portal/advanceSearch
This dataset contains information about the flood hazards within the study area. These zones are used by the Federal Emergency Management Agency (FEMA) to designate the Special Flood Hazard Area (SFHA) and for insurance rating purposes. These data are the flood hazard areas that are or will be depicted on the Flood Insurance Rate Map (FIRM). There is one polygon for each contiguous flood zone designated. This information is required for all draft Digital Flood Insurance Rate Maps. 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 (100 year), the 0.2-percent-annual-chance flood event (500 year), 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. The FISs and FIRMs are published by FEMA. This dataset is an update to the DFIRM_FLDHAZ_MAR14.shp layer.
The FIRM is the basis for floodplain management, mitigation, and insurance
activities for the National Flood Insurance Program (NFIP). Insurance applications
include enforcement of the mandatory purchase requirement of the Flood Disaster
Protection Act, which "... requires the purchase of flood insurance by property
owners who are being assisted by Federal programs or by Federally supervised,
regulated or insured agencies or institutions in the acquisition or improvement of
land facilities located or to be located in identified areas having special flood
hazards, " Section 2 (b) (4) of the Flood Disaster Protection Act of 1973. In addition
to the identification of Special Flood Hazard Areas (SFHAs), the risk zones shown
on the FIRMs are the basis for the establishment of premium rates for flood
coverage offered through the NFIP. The FIRM Database presents the flood risk
information depicted on the FIRM in a digital format suitable for use in electronic
mapping applications. The FIRM Database serves to archive the information
collected during the Flood Risk Project.
What Is an LFD? A Letter of Final Determination (LFD) is a letter the Federal
Emergency Management Agency (FEMA) sends to the Chief Executive Officer of a
community stating that a new or updated Flood Insurance Rate Map (FIRM) or
Digital Flood Insurance Rate Map (DFIRM) will become effective in 6 months. The
letter also notifies each affected flood prone community participating in the National
Flood Insurance Program (NFIP) that it must adopt a compliant floodplain
management ordinance by the map effective date to remain participants in good
standing in the NFIP.
DFIRM [S_FIRM_Pan] Panel Summary Table of Effective Date
--------------------------------------------------------------------------------
DFIRM_ID EFF_DATE COUNTY PANEL_CNT NOTES
12001C 6/16/2006 ALACHUA COUNTY 109
12003C 6/17/2008 BAKER COUNTY 75
12005C 6/2/2009 BAY COUNTY 168
12007C 5/2/2012 BRADFORD COUNTY 34
12009C 3/17/2014 BREVARD COUNTY 143
12011C 8/18/2014 BROWARD COUNTY 103
12013C 6/18/2013 CALHOUN COUNTY 62
12015C 5/5/2003 CHARLOTTE COUNTY 123
12017C 9/26/2014 CITRUS COUNTY 154
12019C 3/17/2014 CLAY COUNTY 60
12021C 5/16/2012 COLLIER COUNTY 156
12023C 2/4/2009 COLUMBIA COUNTY 119
12027C 11/6/2013 DESOTO COUNTY 88
12029C 3/18/2008 DIXIE COUNTY 61 COUNTY WITH MULTIPLE EFFECTIVE DATES
12029C 9/29/2006 DIXIE COUNTY 67 COUNTY WITH MULTIPLE EFFECTIVE DATES
12031C 6/3/2013 DUVAL COUNTY 180
12033C 9/29/2006 ESCAMBIA COUNTY 104
12035C 7/17/2006 FLAGLER COUNTY 66
12037C 2/5/2014 FRANKLIN COUNTY 59
12039C 2/4/2009 GADSDEN COUNTY 87
12041C 9/29/2006 GILCHRIST COUNTY 64
12043C 9/26/2014 GLADES COUNTY 85
12045C 4/16/2009 GULF COUNTY 8 COUNTY WITH MULTIPLE EFFECTIVE DATES
12045C 9/28/2007 GULF COUNTY 85 COUNTY WITH MULTIPLE EFFECTIVE DATES
12047C 6/4/2010 HAMILTON COUNTY 54
12049C 11/6/2013 HARDEE COUNTY 96
12053C 2/2/2012 HERNANDO COUNTY 151
12057C 8/28/2008 HILLSBOROUGH COUNTY 468 COUNTY WITH MULTIPLE EFFECTIVE DATES
12057C 9/27/2013 HILLSBOROUGH COUNTY 8 COUNTY WITH MULTIPLE EFFECTIVE DATES
12059C 12/17/2010 HOLMES COUNTY 44
12061C 12/4/2012 INDIAN RIVER COUNTY 70
12063C 12/17/2010 JACKSON COUNTY 70
12065C 2/5/2014 JEFFERSON COUNTY 21
12067C 9/29/2006 LAFAYETTE COUNTY 67
12069C 12/18/2012 LAKE COUNTY 94
12071C 8/28/2008 LEE COUNTY 176
12073C 8/18/2009 LEON COUNTY 86
12075C 11/2/2012 LEVY COUNTY 120
12077C 6/18/2013 LIBERTY COUNTY 26
12079C 5/3/2010 MADISON COUNTY 109
12081C 3/17/2014 MANATEE COUNTY 137
12083C 8/28/2008 MARION COUNTY 218
12086C 9/11/2009 MIAMI-DADE COUNTY 251
12087C 2/18/2005 MONROE COUNTY 183
12089C 12/17/2010 NASSAU COUNTY 119 COUNTY WITH MULTIPLE EFFECTIVE DATES
12089C 9/9/9999 NASSAU COUNTY 2 COUNTY WITH MULTIPLE EFFECTIVE DATES
12091C 12/6/2002 OKALOOSA COUNTY 74
12095C 9/25/2009 ORANGE COUNTY 62
12097C 6/18/2013 OSCEOLA COUNTY 66
12101C 9/26/2014 PASCO COUNTY 170
12103C 5/17/2005 PINELLAS COUNTY 6 COUNTY WITH MULTIPLE EFFECTIVE DATES
12103C 8/18/2009 PINELLAS COUNTY 6 COUNTY WITH MULTIPLE EFFECTIVE DATES
12103C 9/3/2003 PINELLAS COUNTY 123 COUNTY WITH MULTIPLE EFFECTIVE DATES
12105C 9/28/2012 POLK COUNTY 25
12107C 2/2/2012 PUTNAM COUNTY 105
12109C 7/18/2011 ST. JOHNS COUNTY 6 COUNTY WITH MULTIPLE EFFECTIVE DATES
12109C 9/2/2004 ST. JOHNS COUNTY 105 COUNTY WITH MULTIPLE EFFECTIVE DATES
12111C 2/16/2012 ST. LUCIE COUNTY 76
12113C 12/19/2006 SANTA ROSA COUNTY 143
12117C 9/28/2007 SEMINOLE COUNTY 38
12119C 9/27/2013 SUMTER COUNTY 155
12121C 4/16/2013 SUWANNEE COUNTY 24 COUNTY WITH MULTIPLE EFFECTIVE DATES
12121C 9/28/2007 SUWANNEE COUNTY 252 COUNTY WITH MULTIPLE EFFECTIVE DATES
12123C 5/4/2009 TAYLOR COUNTY 129
12125C 2/4/2009 UNION COUNTY 42
12127C 2/19/2014 VOLUSIA COUNTY 125
12129C 9/26/2014 WAKULLA COUNTY 29
12131C 9/29/2010 WALTON COUNTY 157
12133C 7/4/2011 WASHINGTON COUNTY 37
--------------------------------------------------------------------------------
**The Following Information Contains The GeoPlan Center Process Steps: Indented Format**
The GeoPlan Center downloaded the Statewide National Flood Hazard Layer
from the following FEMA website on February 26th, 2015.
FEMA Flood Map Service Center
https://msc.fema.gov/portal
Search All Products
https://msc.fema.gov/portal/advanceSearch
Choose one of the three search options below and optionally enter a posting date range.
https://msc.fema.gov/portal/advanceSearch
State -FLORIDA
County - ALACHUA
Community - ALACHUA
Search
Effective Products
NFHL Data-State(1)
Product ID Latest Study Effective Date Latest LOMR Effective Date Size Download
NFHL_12_20150223 09/26/2014 02/23/2015 1400MB
NFHL_12_20150223.zip
NFHL_12_20150223.gdb
Feature Layer: S_Fld_Haz_Ar
The S_Fld_Haz_Ar was originally in the following projection:
GCS_North_American_1983
WKID: 4269 Authority: EPSG
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_North_American_1983
Spheroid: GRS_1980
Semimajor Axis: 6378137.0
Semiminor Axis: 6356752.314140356
Inverse Flattening: 298.257222101
The dataset was projected to the FGDL Albers HARN projection using the following Transformation:
NAD_1983_To_HARN_Florida
The dataset was renamed to dfirm_fldhaz_feb15.
Next the following fields were added and populated:
PRODUCT_ID = "NFHL_12_20150223"
FLOODPLAIN = See Crosswalk Table Below
RISK_LEVEL = See Crosswalk Table Below
DESCRIPT = [SFHA_TF] field Description
[SFHA_TF] = "T" : INSIDE SPECIAL FLOOD HAZARD AREA
[SFHA_TF] = "F" : OUTSIDE SPECIAL FLOOD HAZARD AREA
FGDLAQDATE = "2/26/2015"
AUTOID = OBJECTID
Crosswalk Table
This crosswalk table was used to populate the FLOODPLAIN and
RISK_LEVEL fields.
The crosswalk table / shapefile join was based on the FLDZ field
in the table and the FLDZONE field within the shapefile.
FLDZ FDLZ_DSCPT FLOODPLAIN
B MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
C MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
X MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
A HIGH RISK AREAS 100-YEAR FLOODPLAIN
AE HIGH RISK AREAS 100-YEAR FLOODPLAIN
A1 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A2 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A3 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A4 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A5 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A6 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A7 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A8 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A9 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A10 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A11 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A12 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A13 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A14 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A15 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A16 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A17 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A18 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A19 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A20 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A21 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A22 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A23 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A24 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A25 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A26 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A27 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A28 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A29 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A30 HIGH RISK AREAS 100-YEAR FLOODPLAIN
AH HIGH RISK AREAS 100-YEAR FLOODPLAIN
AO HIGH RISK AREAS 100-YEAR FLOODPLAIN
AR HIGH RISK AREAS 100-YEAR FLOODPLAIN
A99 HIGH RISK AREAS 100-YEAR FLOODPLAIN
D UNDETERMINED UNDETERMINED
V HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
VE HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V1 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V2 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V3 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V4 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V5 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V6 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V7 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V8 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V9 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V10 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V11 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V12 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V13 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V14 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V15 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V16 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V17 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V18 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V19 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V20 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V21 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V22 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V23 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V24 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V25 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V26 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V27 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V28 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V29 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V30 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
0.2 PCT ANNUAL CHANCE FLOOD HAZARD MODERATE RISK AREAS 500-YEAR FLOODPLAIN
OPEN WATER OPEN WATER OPEN WATER
It was noted that sliver polygons existed (primarily in Charlotte County).
However, no methodology was performed by GeoPlan to correct for these issues.
For more information on FEMA's Final Data Structure concerning sliver polygons
please see below.
The FEMA report frm_gsal.pdf states the following regarding sliver polygons.
L.3.5.2 Topology
Vector data files must meet the following data structure requirements:
* Area spatial features for a given theme must cover the entire study area
without overlaps, underlaps or sliver polygons between adjacent polygons.
--------------------------------------------------------------------------------
** What is a "100-year flood" and how is it different from a "1-percent-annual-chance flood" or a "base flood?" **
The term "100-year flood" is misleading. It is not the flood that will occur once every
100 years. Rather, it is the flood that has a 1-percent chance of being equaled or
exceeded each year. Thus, the 100-year flood could occur more than once in a
relatively short period of time or even within the same month. Because this term is
misleading, FEMA has also defined it as the "1-percent-annual-chance flood." The
"1-percent-annual-chance flood" is the term that is now used by most federal and
state agencies and by the National Flood Insurance Program.
SOURCE: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
--------------------------------------------------------------------------------
** The following FEMA DFIRM information is from the frm_gsalb.pdf **
Table: S_Fld_Haz_Ar This table is required for all draft Digital Flood Insurance Rate
Map data. The S_Fld_Haz_Ar table contains information about the flood hazards
within the study area. A spatial file with locational information also corresponds with
this data table. These zones are used by the federal Emergency Management
Agency (FEMA) to designate the Special Flood Hazard Area (SFHA) and for
insurance rating purposes. These data are the flood hazard areas that are or will be
depicted on the Flood Insurance Rate Map (FIRM). A spatial file with locational
information also corresponds with this data table. The spatial elements representing
the flood zones are polygons. The entire area of the jurisdiction(s) mapped by the
FIRM should have a corresponding flood zone polygon. There is one polygon for
each contiguous flood zone designated. This is a modified Standard DFIRM
Database table that includes Standard DFIRM Database items and Enhanced
Database items. All items after SOURCE_CIT are Enhanced. Table: D_Zone
Where the 1-percent-annual-chance flood or the 0.2-percent-annual-chance flood
is contained in a culvert or channel, a corresponding feature appears in the
S_Fld_Haz_Ar table only if an SFHA or 0.2-percent-annual-chance flood zone is
shown on the FIRM in this area. In general, these culverts and channels are to be
represented in the general structure table regardless of how the flood insurance risk
zones are depicted. So, if these structures are shown on the FIRM as a dashed line
passing through a Zone X, no corresponding flood insurance risk zone is shown in
S_Fld_Haz_Ar table in the DFIRM database. If a narrow SFHA or 0.2-percent-
annual-chance flood zone is shown on the FIRM, then a narrow polygon must be
included in the DFIRM database. If the width of this flood insurance risk zone is
accurately known and represented in the spatial data, the normal flood insurance
risk zone is applied. If the width of the flood insurance risk zone is not accurately
known and represented because of scale limitations, then the zone is designated as
1-percent-annual-chance flood contained in channel or 0.2-percent-annual-chance
flood contained in channel as appropriate. ZONE_LID FLD_ZONE 1000 A 1001 AE
1002 AH 1003 AO 1004 AR 1005 1 PCT ANNUAL CHANCE FLOOD HAZARD
CONTAINED IN CHANNEL 1006 1 PCT FUTURE CONDITIONS 1007 A99 1008 V
1009 VE 2000 0.2 PCT ANNUAL CHANCE FLOOD HAZARD 2001 0.2 PCT
ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL 3000 AREA
NOT INCLUDED 4000 D 4001 X PROTECTED BY LEVEE 4002 X 5000 OPEN
WATER Flood Zone. This is the flood insurance risk zone designation. These
zones are used by the Federal Emergency Management Agency (FEMA) to
designate Special Flood Hazard Areas (SFHAs) and for insurance rating purposes.
Some older FEMA FIRMs were prepared in the Standard format that uses Zones B,
C and numbered A and V zones. Newer FIRMs use the Map Initiatives format where
the B corresponds to 0.2 pct ANNUAL CHANCE FLOOD HAZARD; C corresponds
to Zone X; numbered A zones (e.g., A1, A2, A3) correspond to Zone AE; and
numbered V zones (e.g., V1, V2, V3) correspond to Zone VE. All Digital Flood
Insurance Rate Maps (DFIRMs) should use the Map Initiatives zone designations.
See Volume 1, Subsection 1.4.6.1.5 of these Guidelines for details on the flood
insurance risk zones. (NOTE: The symbol '%' is a reserved symbol in most software
packages so the word 'percent' was abbreviated to 'pct'.) Table: D_Floodway
FLDWAY_LID FLOODWAY 1000 FLOODWAY 1010 COLORADO RIVER 1020
FLOODWAY CONTAINED IN CHANNEL 1030 FLOWAGE EASEMENT
BOUNDARY 1040 STATE ENCROACHMENT 1050 AREA OF SPECIAL
CONSIDERATION Table: D_Length_Units LEN_LID LEN_UNIT 1000
CENTIMETERS 1010 FEET 1020 INCHES 1030 KILOMETERS 1040 METERS
1050 MILES 1060 MILLIMETERS Table: D_Velocity_Units VEL_LID VEL_UNIT
1000 CENTIMETERS / DAY 1010 CENTIMETERS / HOUR 1020 FEET /
SECOND 1030 INCHES / DAY 1040 INCHES / HOUR 1050 METERS / SECOND
1060 MICROMETERS / SECOND 1070 MILLIMETERS / DAY 1080
MILLIMETERS / HOUR
--------------------------------------------------------------------------------
20010606
20150223
publication date
As needed
-87.429040
-79.872251
30.983191
24.492815
NONE
inlandWaters
NONE
FLOOD HAZARD
Floodway
Digital Flood Insurance Rate Map
SFHA
DFIRM
FEMA Flood Hazard Zone
FEMA
Riverine flooding
Flood Insurance Rate Map
NFIP
FIRM
Special Flood Hazard Area
DFIRM Database
GNIS
Florida
None
2015
20150223
02232015
None
FEMA Disclaimer: No warranty expressed or implied is made by FEMA regarding the
utility of the data on any other system nor shall the act of distribution constitute any
such warranty. FEMA will warrant the delivery of this product in a computer-readable
format, and will offer appropriate adjustment of credit when the product is
determined unreadable by correctly adjusted computer input peripherals, or when
the physical medium is delivered in damaged condition. Requests for adjustment of
credit must be made within 90 days from the date of this shipment from the ordering
site. The hardcopy FIRM and FIRM Database and the accompanying FIS are the
official designation of SFHAs and Base Flood Elevations (BFEs) for the NFIP. For
the purposes of the NFIP, changes to the flood risk information published by FEMA
may only be performed by FEMA and through the mechanisms established in the
NFIP regulations (44 CFR Parts 59-78). These digital data are produced in
conjunction with the hardcopy FIRMs and generally match the hardcopy map
exactly. Acknowledgement of FEMA would be appreciated in products derived from
these data.
Federal Emergency Management Agency
Flood Map Service Center
Federal Insurance and Mitigation Administration
mailing
500 C Street SW
Washington
DC
20472
US
(202) 646-2500
www.msc.fema.gov
FEMA
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4000
Federal Emergency Management Agency
20150223
NFHL Data-State (FL)
vector digital data
500 C Street SW, Washington, DC, 20472, US
Federal Emergency Management Agency
FEMA Flood Map Service Center
https://msc.fema.gov/portal/advanceSearch
NFHL Resources
http://www.fema.gov/national-flood-insurance-program-flood-hazard-mapping/national-flood-hazard-layer-nfhl
National Flood Hazard Layer (NFHL): New Products and Services for FEMA's Flood Hazard Map Data
http://www.fema.gov/media-library/assets/documents/13424?id=3286
NFHL GIS Data: Perform Spatial Analyses and Make Custom Maps and Reports
http://www.fema.gov/media-library/assets/documents/13476?id=3291
Guidelines and Standards for Flood Risk Analysis and Mapping
http://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping
Technical References
http://www.fema.gov/media-library/assets/documents/34519
Guidance Documents
http://www.fema.gov/media-library/assets/documents/34953
Map Modernization
http://www.fema.gov/national-flood-insurance-program-flood-hazard-mapping/map-modernization
GeoPlan relied on the integrity of the attribute information within
the original data.
When FEMA revises an FIS, adjacent studies are checked to ensure agreement
between flood elevations at the boundaries. Likewise flood elevations at the
confluence of streams studied independently are checked to ensure agreement at
the confluence. The FIRM and the FIS are developed together and care is taken
to ensure that the elevations and other features shown on the flood profiles in the
FIS agree with the information shown on the FIRM. However, the elevations as
shown on the FIRM are rounded whole-foot elevations. They must be shown so
that a profile recreated from the elevations on the FIRM will match the FIS profiles
within one half of one foot.
Data contained in the NFHL reflects the content of the source materials. Features
may have been eliminated or generalized on the source graphic, due to scale and
legibility constraints. With new mapping, FEMA plans to maintain full detail in the
spatial data it produces. However, older information is often transferred from existing
maps where some generalization has taken place. Flood risk data are developed for
communities participating in the NFIP for use in insurance rating and for floodplain
management. Flood hazard areas are determined using statistical analyses of
records of river flow, storm tides, and rainfall; information obtained through
consultation with the communities; floodplain topographic surveys; and hydrological
and hydraulic analysis. Generally, regulatory water surface elevations and/or
regulatory floodways are published only for developed or developing areas of
communities. For areas where little or no development is expected to occur, FEMA
may generate flood risk data without published water surface elevations. Typically,
only drainage areas that are greater than one square mile and with an average of
one foot of flood depth or greater are studied. Note: The NFHL reflects the most
current information available when the distribution data set was created. Currently,
not all areas of a State or Territory have effective FIRM Database data. As a result,
users may need to refer to the effective FIRM for effective flood hazard information.
The NFHL consists of vector files and associated attributes produced in
conjunction with the hardcopy FEMA FIRM. The published effective FIRM and
FIRM Database are issued as the official designation of the SFHAs. As such they
are adopted by local communities and form the basis for administration of the NFIP.
For these purposes they are authoritative. Provisions exist in the regulations for
public review, appeals and corrections of the flood risk information shown to better
match real world conditions. As with any engineering analysis of this type, variation
from the estimated flood heights and floodplain boundaries is possible. Details of
FEMA's requirements for the FISs and flood mapping process that produces these
data are available in the Guidelines and Standards for Flood Risk Analysis and
Mapping. Horizontal accuracy was tested by manual comparison of source graphics
with hardcopy plots and a symbolized display on an interactive computer graphic
system. Independent quality control testing of the individual FIRM Database
components of the NFHL was also performed.
The NFHL consists of vector files and associated attributes produced in
conjunction with the hardcopy FEMA FIRM. The published effective FIRM and
FIRM Database are issued as the official designation of the SFHAs. As such they
are adopted by local communities and form the basis for administration of the NFIP.
For these purposes they are authoritative. Provisions exist in the regulations for
public review, appeals and corrections of the flood risk information shown to better
match real world conditions. As with any engineering analysis of this type, variation
from the estimated flood heights and floodplain boundaries is possible. Details of
FEMA's requirements for the FISs and flood mapping process that produces these
data are available in the Guidelines and Standards for Flood Risk Analysis and
Mapping. The reliability of the floodplain boundary delineation is quantified by
comparing the computed flood elevation to the ground elevation at the mapped
floodplain boundary. The tolerance for how precisely the flood elevation and the
ground elevation must match varies based on the flood risk class, which is a
function of population, population density, and/or anticipated growth in floodplain
areas. A horizontal accuracy of +/- 38 feet is used to determine the compliance with
the vertical tolerances defined for each risk class. The range of differences
between the ground elevation (defined from the topographic data used for the Flood
Risk Project) and the computed flood elevation is between +/- 1.0 foot at the 95%
confidence interval for areas with high population within the floodplain and/or high
anticipated growth and Special Flood Hazard Areas (SFHAs) with high flood risk to
+/- one-half the contour interval at the 85% confidence interval for areas with low
population and densities within the floodplain and small or no anticipated growth
and SFHAs with low flood risk. Independent quality control testing of the individual
FIRM Database components of the NFHL was also performed.
Federal Emergency Management Agency
20150223
Digital Flood Insurance Rate Map
NFHL_12_20150223
vector digital data
Washington, D.C.
Federal Emergency Management Agency
GCS_North_American_1983
WKID: 4269 Authority: EPSG
http://msc.fema.gov/portal/advanceSearch
12000
20150223
publication date
FEMA
Spatial and Attribute Information
The NFHL dataset is a compilation of effective FIRM Databases (a collection of the
digital data that are used in GIS systems for creating new Flood Insurance Rate
Maps) and Letters of Map Change (Letters of Map Amendment and Letters of Map
Revision only) that create a seamless GIS data layer for a State or Territory. It is
updated on a monthly basis. The FIRM Databases are compiled in conjunction with
the hardcopy FIRMs and the final FIS reports. The specifics of the hydrologic and
hydraulic analyses performed are detailed in the FIS reports available for each
jurisdiction. The results of these studies are submitted in digital format to FEMA.
These data and unrevised data from effective FIRMs are compiled onto the base
map used for FIRM publication and checked for accuracy and compliance with
FEMA standards. As new FIRM Databases are received the individual FIRM layers
are sewn into the nationwide layers of the NFHL. LOMRs for the FIRM Databases
in the NFHL are cut directly into the NFHL data layers as they are being produced
and finalized.
FEMA
20150130
Federal Emergency Management Agency
Flood Map Service Center
Federal Insurance and Mitigation Administration
mailing
500 C Street SW
Washington
DC
20472
US
1-800-358-9616
www.msc.fema.gov
The GeoPlan Center downloaded the Statewide National Flood Hazard Layer
from the following FEMA website on February 26th, 2015.
FEMA Flood Map Service Center
https://msc.fema.gov/portal
Search All Products
https://msc.fema.gov/portal/advanceSearch
Choose one of the three search options below and optionally enter a posting date range.
https://msc.fema.gov/portal/advanceSearch
State -FLORIDA
County - ALACHUA
Community - ALACHUA
Search
Effective Products
NFHL Data-State(1)
Product ID Latest Study Effective Date Latest LOMR Effective Date Size Download
NFHL_12_20150223 09/26/2014 02/23/2015 1400MB
NFHL_12_20150223.zip
NFHL_12_20150223.gdb
Feature Layer: S_Fld_Haz_Ar
The S_Fld_Haz_Ar was originally in the following projection:
GCS_North_American_1983
WKID: 4269 Authority: EPSG
Angular Unit: Degree (0.0174532925199433)
Prime Meridian: Greenwich (0.0)
Datum: D_North_American_1983
Spheroid: GRS_1980
Semimajor Axis: 6378137.0
Semiminor Axis: 6356752.314140356
Inverse Flattening: 298.257222101
The dataset was projected to the FGDL Albers HARN projection using the following Transformation:
NAD_1983_To_HARN_Florida
The dataset was renamed to dfirm_fldhaz_feb15.
Next the following fields were added and populated:
PRODUCT_ID = "NFHL_12_20150223"
FLOODPLAIN = See Crosswalk Table Below
RISK_LEVEL = See Crosswalk Table Below
DESCRIPT = [SFHA_TF] field Description
[SFHA_TF] = "T" : INSIDE SPECIAL FLOOD HAZARD AREA
[SFHA_TF] = "F" : OUTSIDE SPECIAL FLOOD HAZARD AREA
FGDLAQDATE = "2/26/2015"
AUTOID = OBJECTID
Crosswalk Table
This crosswalk table was used to populate the FLOODPLAIN and
RISK_LEVEL fields.
The crosswalk table / shapefile join was based on the FLDZ field
in the table and the FLDZONE field within the shapefile.
FLDZ FDLZ_DSCPT FLOODPLAIN
B MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
C MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
X MODERATE TO LOW RISK AREAS OUTSIDE FLOODPLAIN
A HIGH RISK AREAS 100-YEAR FLOODPLAIN
AE HIGH RISK AREAS 100-YEAR FLOODPLAIN
A1 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A2 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A3 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A4 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A5 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A6 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A7 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A8 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A9 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A10 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A11 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A12 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A13 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A14 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A15 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A16 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A17 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A18 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A19 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A20 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A21 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A22 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A23 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A24 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A25 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A26 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A27 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A28 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A29 HIGH RISK AREAS 100-YEAR FLOODPLAIN
A30 HIGH RISK AREAS 100-YEAR FLOODPLAIN
AH HIGH RISK AREAS 100-YEAR FLOODPLAIN
AO HIGH RISK AREAS 100-YEAR FLOODPLAIN
AR HIGH RISK AREAS 100-YEAR FLOODPLAIN
A99 HIGH RISK AREAS 100-YEAR FLOODPLAIN
D UNDETERMINED UNDETERMINED
V HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
VE HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V1 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V2 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V3 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V4 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V5 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V6 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V7 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V8 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V9 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V10 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V11 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V12 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V13 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V14 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V15 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V16 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V17 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V18 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V19 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V20 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V21 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V22 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V23 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V24 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V25 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V26 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V27 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V28 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V29 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
V30 HIGH RISK - COASTAL AREAS 100-YEAR FLOODPLAIN
0.2 PCT ANNUAL CHANCE FLOOD HAZARD MODERATE RISK AREAS 500-YEAR FLOODPLAIN
OPEN WATER OPEN WATER OPEN WATER
It was noted that sliver polygons existed (primarily in Charlotte County).
However, no methodology was performed by GeoPlan to correct for these issues.
For more information on FEMA's Final Data Structure concerning sliver polygons
please see below.
The FEMA report frm_gsal.pdf states the following regarding sliver polygons.
L.3.5.2 Topology
Vector data files must meet the following data structure requirements:
* Area spatial features for a given theme must cover the entire study area
without overlaps, underlaps or sliver polygons between adjacent polygons.
GeoPlan
20150226
GeoPlan Center University of Florida
Kate Norris
Senior GIS Specialist
mailing and physical
431 Architecture PO Box 115706
Gainesville
FL
32611
US
www.fgdl.org
data@fgdl.org
Vector
G-polygon
325966
Albers Conical Equal Area
24.000000
31.500000
-84.000000
24.000000
400000.000000
0.000000
coordinate pair
0.002048
0.002048
meters
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
DFIRM_FLDHAZ_FEB15
DFIRM_FLDHAZ_FEB15.DBF
FEMA
OBJECTID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
SHAPE
Feature geometry.
Esri
Coordinates defining the features.
DFIRM_ID
Flood Risk Project Identifier. For a single-jurisdiction flood risk project, the value is composed of the 2-digit state FIPS code and the 4-digit FEMA CID code (e.g., 480001). For a countywide flood risk project, the value is composed of the 2-digit state FIPS code, the 3-digit county FIPS code, and the letter “C” (e.g., 48107C). Within each FIRM database, the DFIRM_ID value is identical.
FEMA
N/A
N/A
N/A
VERSION_ID
Version Identifier. Identifies the product version and relates the feature to standards according to which it was created.
FEMA
N/A
N/A
N/A
FLD_AR_ID
Primary key for table lookup. Assigned by table creator.
FEMA
N/A
N/A
N/A
STUDY_TYP
Study Type. This describes the type of flood risk project performed for flood hazard identification. Acceptable values for this field are listed in the D_Study_Typ table. "NP" = Not Populated.
FEMA
N/A
N/A
N/A
FLD_ZONE
Flood Zone. This is a flood zone designation. These zones are used by FEMA to designate the SFHAs 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 D_Zone table.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
A
Zone A is the flood insurance rate zone used for 1-percent-annual-chance (base flood) floodplains that are determined for the Flood Insurance Study (FIS) by approximate methods of analysis. Because detailed hydraulic analyses are not performed for such areas, no Base Flood Elevations (BFEs) or depths are shown in this zone. Mandatory flood insurance purchase requirements apply.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
AE and A1-A30
Zones AE and A1-A30 are the flood insurance rate zones used for the 1-percent-annual-chance floodplains that are determined for the FIS by detailed methods of analysis. In most instances, BFEs derived from the detailed hydraulic analyses are shown at selected intervals in this zone. Mandatory flood insurance purchase requirements apply. AE zones are areas of inundation by the 1-percent-annual-chance flood, including areas with the 2-percent wave runup, elevation less than 3.0 feet above the ground and areas with wave heights less than 3.0 feet. These areas are subdivided into elevation zones with BFEs assigned. The AE zone will generally extend inland to the limit of the 1-percent-annual-chance Stillwater Flood Level (SWEL).
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
AH
Zone AH is the flood insurance rate zone used for 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. BFEs derived from detailed hydraulic analyses are shown at selected intervals within this zone. Mandatory flood insurance purchase requirements apply.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
AO
AO zones are areas of sheet-flow shallow flooding where the potential runup is less than 3.0 feet above an overtopped barrier crest (R<3.0 feet). The sheet flow in these areas will either flow into another flooding source (AE zone), result in ponding (AH zone) or deteriorate because of ground friction and energy losses and merge into the X zone. AO areas are designated with 1-, 2-, or 3-foot depths of flooding.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
AR
Zone AR is the flood insurance rate zone used for areas protected by flood-control structures, such as levees, that are being restored. FEMA will consider using the Zone AR designation 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 apply in Zone AR but the rate will not exceed that of an unnumbered Zone A, if the structure is built in compliance with Zone AR floodplain management regulations. For floodplain management in Zone AR areas, the property owner is not required to elevate existing structures when making improvements. However, new structures must be elevated (or flood proofed for nonresidential structures) so that the lowest floor, including the basement, is at least 3 feet above the highest adjacent existing grade, if the BFE does not exceed 5 feet at the proposed development site. For infill sites, rehabilitation of existing structures or redevelopment of previously developed areas, there is a 3-foot elevation requirement regardless of the depth of the BFE at the project site. The Zone AR designation will be removed and the restored flood-control system will be shown as providing protection from the base flood on the National Flood Insurance Program (NFIP) map when the restoration project is complete and all the necessary data have been submitted to FEMA.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
A99
Zone A99 is the flood insurance rate zone used for 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 BFEs or depths are shown in this zone. Mandatory flood insurance purchase requirements apply.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
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. Flood insurance is optional and available and the flood insurance rates for properties in Zone D are commensurate with the uncertainty of the flood risk.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
V and V1 - 30
Zone V and V1 - 30 designation is for coastal areas with a 1-percent or greater chance of flooding and an additional velocity hazard associated with storm waves (wave action). Because detailed hydraulic analyses are not performed for such areas, no BFEs or depths are shown in this zone. Mandatory flood insurance purchase requirements apply.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
VE
VE zones are coastal high hazard areas where wave action and/or high-velocity water can cause structural damage during the base flood. They are subdivided into elevation zones with BFEs assigned. VE zones are identified using one or more of the following criteria for the base flood conditions: [1] The wave runup zone occurs where the (eroded) ground profile is 3.0 feet or more below the 2-percent wave runup elevation. [2] The wave overtopping splash zone is the area landward of the crest of an overtopped barrier, in cases where the potential 2-percent wave runup exceeds the barrier crest elevation by 3.0 feet or more(R>3.0 feet). (See Subsection D.2.8.2.). [3] The breaking wave height zone occurs where 3-foot or greater wave heights could occur (this is the area where the wave crest profile is 2.1 feet or more above the total stillwater level). [4] The primary frontal dune zone, as defined in 44 CFR Section 59.1 of the NFIP regulations. For the Pacific Coast only: [5] The high-velocity flow zone is landward of the overtopping splash zone (or area on a sloping beach or other shore type), where the product of depth of flow times the flood velocity squared (hv2) is greater than or equal to 200 ft3/sec2.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
B and X (shaded)
Zones B and X (shaded) are areas of 0.2-percent-annual-chance floodplain, areas of 1-percent-annual-chance (base flood) sheet flow flooding with average depths of less than 1 foot, areas of base flood stream flooding with a contributing drainage area of less than 1 square mile or areas protected from the base flood by levees. No BFEs or depths are shown in this zone and insurance purchase is not required.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
C and X (unshaded)
Zones C and X (unshaded) are flood insurance rate zones used for areas outside the 0.2-percent-annual-chance floodplain. No BFEs or depths are shown in this zone, and insurance purchase is not required.
FEMA: https://www.fema.gov/frequently-asked-questions/insurance-professionals-lenders-frequently-asked-questions
ZONE_SUBTY
Flood Zone Subtype. This field captures additional information about the flood zones not related to insurance rating purposes. For example, insurance rate zone Shaded X could have “PROTECTED BY LEVEE” or “0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN STRUCTURE.” Types of floodways are also stored in this field. Floodways 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 floodways are specified as ‘FLOODWAY.’ 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 D_Zone_Subtype table.
FEMA
N/A
N/A
N/A
SFHA_TF
Special Flood Hazard Area. If the area is within SFHA this field would be True. This field will be true for any area that is coded for any A or V zone flood areas. It should be false for any X or D zone flood areas. Enter "T" for true or "F" for false.
FEMA
T
True
FEMA
F
False
FEMA
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.
FEMA
N/A
N/A
N/A
V_DATUM
Vertical Datum. The vertical datum indicates the reference surface from which the flood elevations are measured. Normally this would be North American Vertical Datum of 1988 for new studies. This field is only populated if the STATIC_BFE field is populated. Acceptable values for this field are listed in the D_V_Datum table.
FEMA
N/A
N/A
N/A
DEPTH
Depth Value for Zone AO Areas. This is shown beneath the zone label on the FIRM. This field is only populated if a depth is shown on the FIRM.
FEMA
N/A
N/A
N/A
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.
FEMA
N/A
N/A
N/A
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.
FEMA
N/A
N/A
N/A
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.
FEMA
N/A
N/A
N/A
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.
FEMA
N/A
N/A
N/A
AR_SUBTRV
Flood Control Restoration Zones – Zone AR Classification Zone Subtype. If this area is Zone AR in FLD_Zone field, this field would hold the zone subtype that area would revert to if the AR zone were removed. This field is only populated if the corresponding area is Zone AR. 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 D_Zone_Subtype_ table and must be one of the allowable subtypes for Zones AE, AO, AH, A, or X.
FEMA
N/A
N/A
N/A
BFE_REVERT
If Zone is Zone AR, this field would hold the static base flood elevation for the reverted zone. This field is populated when Zone equals AR and the reverted zone has a static BFE.
FEMA
N/A
N/A
N/A
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.
FEMA
N/A
N/A
N/A
DUAL_ZONE
Flood Control Restoration Zones – Dual Zone Classification. If the flood hazard areas shown on the effective FIRM shall be designated as “dual” flood insurance rate zones (i.e., Zone AR/AE, Zone AR/AH, Zone AR/AO, Zone AR/A), this field will be coded as true. It should be false for any for AR Zones that revert to Shaded X. Acceptable values for this field are listed in the D_TrueFalse table. Dual zones (AR/AE) are flood zones with a risk of flooding from other water sources not protected by the flood protection system being restored. This means that despite the completion of a levee repair project, the area will continue to be in a high risk flood zone due to a flooding source other than the AR Zone source. In this situation, flood insurance purchase requirements apply.
FEMA
N/A
N/A
N/A
SOURCE_CIT
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.
FEMA
N/A
N/A
N/A
PRODUCT_ID
FEMA Flood Map Service Center Product ID. https://msc.fema.gov/portal/advanceSearch
GeoPlan
NFHL_12_20150223
NFHL_12_20150223
GeoPlan
FLOODPLAIN
Floodplain description based on FLD_ZONE field.
GeoPlan
100-YEAR FLOODPLAIN
This is an area inundated by 100-year flooding.
GeoPlan
500-YEAR FLOODPLAIN
This is an area inundated by 500-year flooding.
GeoPlan
OPEN WATER
This area is an open water body.
GeoPlan
OUTSIDE FLOODPLAIN
This is an area outside the 100 and 500-year flood plains.
GeoPlan
UNDETERMINED
Areas with possible but undetermined flood hazards. No flood hazard analysis has been conducted. Flood insurance rates are commensurate with the uncertainty of the flood risk. Zone: D.
GeoPlan
RISK_LEVEL
Floodplain area risk level based on FLD_ZONE field.
GeoPlan
HIGH RISK - COASTAL AREAS
In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: V, VE, V1 - 30.
GeoPlan
HIGH RISK AREAS
In communities that participate in the NFIP, mandatory flood insurance purchase requirements apply to all of these zones: A, AE, A1-A30, AH, AO, AR, A99.
GeoPlan
MODERATE RISK AREAS
In communities that participate in the NFIP, flood insurance is available to all property owners and renters in these zones: 0.2 PCT ANNUAL CHANCE FLOOD HAZARD
GeoPlan
MODERATE TO LOW RISK AREAS
In communities that participate in the NFIP, flood insurance is available to all property owners and renters in these zones: B, C, and X. Insurance purchase is not required in these zones.
GeoPlan
OPEN WATER
Body of open water that has no defined flood hazard.
GeoPlan
UNDETERMINED
Areas with possible but undetermined flood hazards. No flood hazard analysis has been conducted. Flood insurance rates are commensurate with the uncertainty of the flood risk. Zone: D.
GeoPlan
DESCRIPT
Based on SFHA_TF field description.
GeoPlan
INSIDE SPECIAL FLOOD HAZARD AREA
[SFHA_TF] - "T" value description.
GeoPlan
OUTSIDE SPECIAL FLOOD HAZARD AREA
[SFHA_TF] - "F" value description.
GeoPlan
FGDLAQDATE
Date FGDL acquired the data from the Source.
GeoPlan
20150226
20150226
GeoPlan
AUTOID
Unique ID added by GeoPlan
GeoPlan
1
325966
SHAPE.AREA
Area in meters
GeoPlan
SHAPE.LEN
Perimeter in meters
GeoPlan
The DFIRM Database is made up of several data themes containing both spatial
and attribute information. These data together represent the current flood risk for the
subject area as identified by FEMA. The attribute tables include SFHA locations,
flood zone designations, BFEs, political entities, cross-section locations, FIRM panel
information, and other data related to the NFIP.
Appendix L of FEMA's Guidelines and Specifications for FEMA Flood Hazard
Mapping Partners contains a detailed description of each attribute code and a
reference to other relevant information. The following tables are included in this data
set: l_comm_info l_stn_start study_info s_bfe s_base_index s_firm_pan
s_fld_haz_ar s_fld_haz_ln s_gen_struct s_label_ld s_perm_bmk s_pol_ar s_pol_ln
s_quad_index s_wtr_ln s_xs s_label_pt
Florida Geographic Data Library (FGDL)
mailing address
431 Architecture PO Box 115706
Gainesville
Florida
32611-5706
United States
Web site: http://www.fgdl.org
Technical Support: http://www.fgdl.org/fgdlfeed.html
For FGDL Software: http://www.fgdl.org/software.html
FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html
Mailing list for FGDL: http://www.fgdl.org/fgdl-l.html
DOWNLOADABLE DATA
The Florida Geographic Data Library is a collection of Geospatial Data
compiled by the University of Florida GeoPlan Center with support from
the Florida Department of Transportation. GIS data available in FGDL is
collected from various state, federal, and other agencies (data sources)
who are data stewards, producers, or publishers. The data available in
FGDL may not be the most current version of the data offered by the
data source. University of Florida GeoPlan Center makes no guarantees
about the currentness of the data and suggests that data users check
with the data source to see if more recent versions of the data exist.
Furthermore, the GIS data available in the FGDL are provided 'as is'.
The University of Florida GeoPlan Center makes no warranties, guaranties
or representations as to the truth, accuracy or completeness of the data
provided by the data sources. The University of Florida GeoPlan Center
makes no representations or warranties about the quality or suitability
of the materials, either expressly or implied, including but not limited
to any implied warranties of merchantability, fitness for a particular
purpose, or non-infringement. The University of Florida GeoPlan Center
shall not be liable for any damages suffered as a result of using,
modifying, contributing or distributing the materials.
A note about data scale:
Scale is an important factor in data usage. Certain scale datasets
are not suitable for some project, analysis, or modeling purposes.
Please be sure you are using the best available data.
1:24000 scale datasets are recommended for projects that are at the
county level.
1:24000 data should NOT be used for high accuracy base mapping such
as property parcel boundaries.
1:100000 scale datasets are recommended for projects that are at the
multi-county or regional level.
1:125000 scale datasets are recommended for projects that are at the
regional or state level or larger.
Vector datasets with no defined scale or accuracy should be
considered suspect. Make sure you are familiar with your data
before using it for projects or analysis. Every effort has been
made to supply the user with data documentation. For additional
information, see the References section and the Data Source Contact
section of this documentation. For more information regarding
scale and accuracy, see our webpage at:
http://geoplan.ufl.edu/education.html
www.fgdl.org
Contact Distributor
This data is intended for use with a Geographic Information Systems or Remote Sensing software package.
20150426
Federal Emergency Management Agency
Flood Map Service Center
Federal Insurance and Mitigation Administration
mailing
500 C Street SW
Washington
DC
20472
US
1-800-358-9616
www.msc.fema.gov
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
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