Geodataset Name:       DFIRM_SFHA_SV_OCT17
Geodataset Type:       FGDB Feature Class
Geodataset Feature:    Polygon
Feature Count:         216093

DATA SOURCE(S):                    Federal Emergency Management Agency
SCALE OF ORIGINAL SOURCE MAPS:     12000
GEODATASET EXTENT:                 State of Florida

PUBLICATION DATE:                  20171006
TIME PERIOD OF CONTENT:            Begin Date: 20010606    End Date: 20171006
DOWNLOAD LINK:                     http://www.fgdl.org/metadataexplorer/explorer.jsp

FEATURE ATTRIBUTE TABLES:

Datafile Name: DFIRM_SFHA_SV_OCT17.DBF

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item	Item Description
OBJECTID	Internal feature number.
SHAPE	Feature geometry.
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.
VERSION_ID	Version Identifier. Identifies the product version and relates the feature to standards according to which it was created. 1.1.1.0 = Unknown 2.3.3.2 = Unknown
FLD_AR_ID	Primary key for table lookup. Assigned by table creator.
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. Please Note: For Shaded X the value should be SFHAS WITH HIGH FLOOD RISK, and for Unshaded X the value should be NP (Domain Table Technical Reference pg 49). NP = Unknown SFHAS WITH HIGH FLOOD RISK = Unknown SFHAS WITH LOW FLOOD RISK = Unknown
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. 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. AE = Zone AE is the flood insurance rate zone that corresponds to the 1% annual chance floodplains. Base flood elevations derived from the hydraulic analyses are shown within this zone. 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. AO = Zone AO 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. AREA NOT INCLUDED = Unknown 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. OPEN WATER = Unknown V = Zone V is the flood insurance rate zone that corresponds to the 1% annual chance coastal floodplains that have additional hazards associated with storm waves. Base flood elevations are not shown within this zone. VE = Zone VE 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. X = Zone X is classified as Shaded or Unshaded. (1)Shaded Zone X: Areas of 0.2% annual chance flood hazards and areas of 1% annual chance flood hazards with average depths of less than 1 foot or with drainage areas less than 1 square mile. (2)Future Conditions: 1% Annual Chance Flood Hazard - Zone X: The flood insurance rate zone that corresponds to the 1% annual chance floodplains that are determined based on future-conditions hydrology. No base flood elevations or flood depths are shown within this zone. (3)Area with Reduced Flood Risk due to Levee: Areas where an accredited levee, dike, or other flood control structure has reduced the flood risk from the 1% annual chance flood. See Notes to Users for important information. (4)Area with Flood Risk due to Levee: Areas where a non-accredited levee, dike, or other flood control structure is shown as providing protection to less than the 1% annual chance flood. (5)Unshaded Zone X: Areas of minimal flood hazard.
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. {Null Value / Empty Field Entry} = Unknown 0.2 PCT ANNUAL CHANCE FLOOD HAZARD = Shaded Zone X: Areas of 0.2% annual chance flood hazards. 0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL = Shaded Zone X: Areas of 0.2% annual chance flood hazards. 1 PCT DEPTH LESS THAN 1 FOOT = Shaded Zone X: 1% annual chance flood hazards with average depths of less than 1 foot. This zone is classified as being within the 500 year floodplain and not the 100 year floodplain because of the following: Flood zones AH and AO reference a base flood depth between 1 and 3 feet. This is in place of a Base Flood Elevation. An area that has a base flood depth below 1 foot is considered to be flood zone X, since the area affected by the 100 year flooding event would be too shallow or too small to identify on the Flood Insurance Rate Map. Please refer to the Shallow Flooding Analyses and Mapping technical document at https://www.fema.gov/media-library-data/1484865782763-4d150592d6eae9fdb5e2c2ab597928a6/Shallow_Flooding_Guidance_Nov_2016.pdf for more information on this classification. AREA OF MINIMAL FLOOD HAZARD = Unshaded Zone X: Areas of minimal flood hazard. AREA WITH REDUCED FLOOD RISK DUE TO LEVEE = Area with Reduced Flood Risk due to Levee: Areas where an accredited levee, dike, or other flood control structure has reduced the flood risk from the 1% annual chance flood. FLOODWAY = Unknown RIVERINE FLOODWAY SHOWN IN COASTAL ZONE = Unknown
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. F = False T = True
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.
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. {Null Value / Empty Field Entry} = Unknown ASVD02 = Unknown NAVD88 = Unknown NGVD29 = Unknown NP = Unknown
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.
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. {Null Value / Empty Field Entry} = Unknown CENTIMETERS = Unknown FEET = Unknown
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.
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. {Null Value / Empty Field Entry} = Unknown FEET / SECOND = Unknown
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. {Null Value / Empty Field Entry} = Unknown
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. {Null Value / Empty Field Entry} = Unknown
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.
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.
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. {Null Value / Empty Field Entry} = Unknown F = Unknown
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.
PRODUCT_ID	FEMA Flood Map Service Center Product ID. https://msc.fema.gov/portal/advanceSearch NFHL_12_20171006 = Unknown
NOTES	Notes on original vertex count for features that were Diced due to size.
VERTCNT	Feature Vertex Count.
FLOODPLAIN	Floodplain description based on FLD_ZONE field. 100-YEAR FLOODPLAIN = This is an area inundated by 100-year flooding. 500-YEAR FLOODPLAIN = This is an area inundated by 500-year flooding. OPEN WATER = This area is an open water body. OUTSIDE FLOODPLAIN = This is an area outside the 100 and 500-year flood plains. 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.
RISK_LEVEL	Floodplain area risk level based on FLD_ZONE field. 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. 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. 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 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. OPEN WATER = Body of open water that has no defined flood hazard. 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.
FHZ_LABEL	Text description of flood zones for map legends based on the FLD_ZONE and ZONE_SUBTY fields. This field matches FEMA's National Flood Hazard Layer (Official) Map Viewer (http://fema.maps.arcgis.com/home/webmap/viewer.html) for the Flood Hazard Zones section of the Map's Legend. Please See: FIS Report Technical Reference, 5.3 Figure 3, Map Legend for FIRM (pg 67 of 85). Refer to the FIRM Panel Technical Reference for the font and symbology specifications of each of these elements in the Map Legend. https://www.fema.gov/media-library-data/1481731412602-a7d8526b8dde6d6e69ef3bbabf2bd68c/FIRM_Panel_Technical_Reference_Nov_2016.pdf 0.2% ANNUAL CHANCE FLOOD HAZARD = 0.2% ANNUAL CHANCE FLOOD HAZARD 1% ANNUAL CHANCE FLOOD HAZARD = 1% ANNUAL CHANCE FLOOD HAZARD AREA NOT INCLUDED = AREA NOT INCLUDED AREA OF MINIMAL FLOOD HAZARD = AREA OF MINIMAL FLOOD HAZARD AREA OF UNDETERMINED FLOOD HAZARD = AREA OF UNDETERMINED FLOOD HAZARD AREA WITH REDUCED RISK DUE TO LEVEE = AREA WITH REDUCED RISK DUE TO LEVEE OPEN WATER = OPEN WATER REGULATORY FLOODWAY = REGULATORY FLOODWAY
DESCRIPT	Based on SFHA_TF field description. INSIDE SPECIAL FLOOD HAZARD AREA = [SFHA_TF] - "T" value description. OUTSIDE SPECIAL FLOOD HAZARD AREA = [SFHA_TF] - "F" value description.
FGDLAQDATE	Date FGDL acquired the data from the Source.
AUTOID	Unique ID added by GeoPlan
SHAPE.AREA	No description
SHAPE.LEN	No description

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. Table containing attribute information associated with the data set. FEMA FIRM Database Technical Reference (available in the FEMA Library at http://www.fema.gov/media-library/assets/documents/34519).

USER NOTES:

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 incorporates all FIRM Databases published by FEMA and any LOMRs that have been issued against those databases since their publication date. 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. Attribute 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. To obtain more detailed information in areas where Base Flood Elevations (BFEs) and/or floodways have been determined, users are encouraged to consult the Flood Profiles and Floodway Data and/or Summary of Stillwater Elevations tables contained within the FIS reports that accompany the individual FIRM Database components of the NFHL. Users should be aware that BFEs shown in the S_BFE table may represent rounded whole-foot elevations. These BFEs are intended for flood insurance rating purposes only and should not be used as the sole source of flood elevation information. Accordingly, flood elevation data presented in the FIS report must be used in conjunction with the FIRM for purposes of construction and/or floodplain management. The 1-percent- annual-chance water-surface elevations shown in the S_XS table match the regulatory elevations shown in the FIS report.

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, 96 12051C, 7/6/2015, HENDRY COUNTY, 54 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12051C, NO DATE AVAILABLE, HENDRY COUNTY, 6 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12053C, 2/2/2012, HERNANDO COUNTY, 151 12055C, 11/18/2015, HIGHLANDS COUNTY, 159 12057C, 8/28/2008, HILLSBOROUGH COUNTY, 234 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12057C, 9/27/2013, HILLSBOROUGH COUNTY, 4 (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, 10/5/2017, LAFAYETTE COUNTY, 18 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12067C, 9/29/2006, LAFAYETTE COUNTY, 56 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 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, 113 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12075C, 2/3/2017, LEVY COUNTY, 7 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12077C, 6/18/2013, LIBERTY COUNTY, 26 12079C, 2/3/2017, MADISON COUNTY, 5 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12079C, 5/3/2010, MADISON COUNTY, 104 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12081C, 3/17/2014, MANATEE COUNTY, 137 12083C, NO DATE AVAILABLE, MARION COUNTY, 6 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12083C, 4/19/2017, MARION COUNTY, 64 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12083C, 8/28/2008, MARION COUNTY, 148 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12085C, 3/16/2015, MARTIN COUNTY, 52 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12085C, NO DATE AVAILABLE, MARTIN COUNTY, 25 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12086C, 9/11/2009, MIAMI-DADE COUNTY, 251 12087C, 2/18/2005, MONROE COUNTY, 183 12089C, 12/17/2010, NASSAU COUNTY, 62 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12089C, 8/2/2017, NASSAU COUNTY, 61 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12091C, 12/6/2002, OKALOOSA COUNTY, 74 12093C, 7/16/2015, OKEECHOBEE COUNTY, 42 12095C, 9/25/2009, ORANGE COUNTY, 62 12097C, 6/18/2013, OSCEOLA COUNTY, 66 12099C, 10/5/2017, PALM BEACH COUNTY, 218 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, 12/22/2016, POLK COUNTY, 108 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12105C, 9/28/2012, POLK COUNTY, 16 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 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 12115C, 11/4/2016, SARASOTA COUNTY, 141 12117C, 9/28/2007, SEMINOLE COUNTY, 38 12119C, 9/27/2013, SUMTER COUNTY, 155 12121C, 2/3/2017, SUWANNEE COUNTY, 10 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12121C, 4/16/2013, SUWANNEE COUNTY, 12 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12121C, 9/28/2007, SUWANNEE COUNTY, 116 (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, 59 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12127C, 9/29/2017, VOLUSIA COUNTY, 66 (COUNTY WITH MULTIPLE EFFECTIVE DATES) 12129C, 9/26/2014, WAKULLA COUNTY, 29 12131C, 9/29/2010, WALTON COUNTY, 157 12133C, 7/4/2011, WASHINGTON COUNTY, 37 Please Note: This table was created by adding the Study_info table's CNTY_NM field to the S_FIRM_Pan field via a table join based on DFIRM_ID. Please Note: 12041C GILCHRIST COUNTY is not listed in the Study_info table for some reason. EFF_DATE_SUM = [DFIRM_ID] & " " & [EFF_DATE] & " " & [CNTY_NM] -------------------------------------------------------------------------------- **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 October 13th, 2017. 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_20171006 10/05/2017 10/06/2017 1975MB NFHL_12_20171006.zip NFHL_12_20171006.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_oct17. Next the following fields were added and populated: PRODUCT_ID = "NFHL_12_20171006" FLOODPLAIN = See Crosswalk Table Below RISK_LEVEL = See Crosswalk Table Below FHZ_LABEL = See Crosswalk Table 2 Below DESCRIPT = [SFHA_TF] field Description [SFHA_TF] = "T" : INSIDE SPECIAL FLOOD HAZARD AREA [SFHA_TF] = "F" : OUTSIDE SPECIAL FLOOD HAZARD AREA FGDLAQDATE = "10/13/2017" 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 OPEN WATER OPEN WATER OPEN WATER A second calculation was done for the following where FLD_ZONE = X and field ZONE_SUBTY combinations existed, see below. 0.2 PCT ANNUAL CHANCE FLOOD HAZARD MODERATE RISK AREAS 500-YEAR FLOODPLAIN 0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL MODERATE RISK AREAS 500-YEAR FLOODPLAIN 1 PCT DEPTH LESS THAN 1 FOOT MODERATE RISK AREAS 500-YEAR FLOODPLAIN AREA WITH REDUCED FLOOD RISK DUE TO LEVEE MODERATE RISK AREAS 500-YEAR FLOODPLAIN Crosswalk Table 2 This crosswalk table was used to populate the FHZ_LABEL field. Text description of flood zones for map legends based on the FLD_ZONE and ZONE_SUBTY fields Calculated Zone Descriptions for field FLD_ZONE = A, AE, AH, AO, AR, A99, V and VE as 1% ANNUAL CHANCE FLOOD HAZARD Calculated Zone Descriptions for field FLD_ZONE = AREA NOT INCLUDED as AREA NOT INCLUDED Calculated Zone Descriptions for field FLD_ZONE = D as AREA OF UNDETERMINED FLOOD HAZARD Calculated Zone Descriptions for field FLD_ZONE = OPEN WATER as OPEN WATER Next Calculated Zone Descriptions for field ZONE_SUBTY = 0.2 PCT ANNUAL CHANCE FLOOD HAZARD as 0.2% ANNUAL CHANCE FLOOD HAZARD 0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL as 0.2% ANNUAL CHANCE FLOOD HAZARD 1 PCT DEPTH LESS THAN 1 FOOT as 0.2% ANNUAL CHANCE FLOOD HAZARD AREA OF MINIMAL FLOOD HAZARD as AREA OF MINIMAL FLOOD HAZARD AREA WITH REDUCED FLOOD RISK DUE TO LEVEE as AREA WITH REDUCED RISK DUE TO LEVEE FLOODWAY as REGULATORY FLOODWAY RIVERINE FLOODWAY SHOWN IN COASTAL ZONE as REGULATORY FLOODWAY 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. Next Deleted the following 3 features due to spatial errors: 12123C_10583 (Duplicate Polygon), 12111C_1676 (Zero Area), 12097C_502 (Negative Area). It was noted that 45 features had vertex counts greater than 500,000. Features with large vertex counts are known to cause database analysis crashes and errors. The ArcGIS Dice Tool subdivides a feature into smaller features based on a specified vertex limit. This tool is intended as a way to subdivide extremely large features that cause issues with drawing, analysis, editing, and/or performance but are difficult to split up with standard editing and geoprocessing tools. This tool should not be used in any cases other than those where tools are failing to complete successfully due to the size of features. Source: http://desktop.arcgis.com/en/arcmap/latest/tools/data-management-toolbox/dice.htm The following 45 features were subdivided using the ArcGIS Dice Tool with a vertex limit of 350,000. FLD_AR_ID = 12009C_360022, 12009C_372109, 12009C_372131, 12009C_372145, 12009C_372214, 12017C_7954, 12021C_776326, 12021C_776328, 12027C_14500, 12031C_758209, 12055C_8415, 12059C_430380, 12061C_1008, 12063C_1589, 12063C_2542, 12065C_6092, 12069C_1921, 12069C_7776, 12073C_4996, 12083C_8426, 12086C_876, 12099C_10990, 12099C_18258, 12099C_42087, 12099C_42778, 12099C_42829, 12105C_14217, 12105C_14218, 12105C_14221, 12105C_18549, 12105C_18634, 12105C_18679, 12105C_18736, 12105C_5196, 12105C_9779, 12111C_2930, 12111C_38, 12115C_10849, 12115C_11027, 12115C_1168, 12115C_3772, 12115C_442, 12115C_447, and 12133C_5475. -------------------------------------------------------------------------------- ** 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 --------------------------------------------------------------------------------

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.

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.

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.

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

REFERENCES:

FEMA Flood Map Service Center https://msc.fema.gov/portal/advanceSearch FEMA FIRM Database Technical Reference (available in the FEMA Library at http://www.fema.gov/media-library/assets/documents/34519).

DATA LINEAGE SUMMARY:

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. Process Date: 20171006 The GeoPlan Center downloaded the Statewide National Flood Hazard Layer from the following FEMA website on October 13th, 2017. 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_20171006 10/05/2017 10/06/2017 1975MB NFHL_12_20171006.zip NFHL_12_20171006.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_oct17. Next the following fields were added and populated: PRODUCT_ID = "NFHL_12_20171006" FLOODPLAIN = See Crosswalk Table Below RISK_LEVEL = See Crosswalk Table Below FHZ_LABEL = See Crosswalk Table 2 Below DESCRIPT = [SFHA_TF] field Description [SFHA_TF] = "T" : INSIDE SPECIAL FLOOD HAZARD AREA [SFHA_TF] = "F" : OUTSIDE SPECIAL FLOOD HAZARD AREA FGDLAQDATE = "10/13/2017" 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 OPEN WATER OPEN WATER OPEN WATER A second calculation was done for the following where FLD_ZONE = X and field ZONE_SUBTY combinations existed, see below. 0.2 PCT ANNUAL CHANCE FLOOD HAZARD MODERATE RISK AREAS 500-YEAR FLOODPLAIN 0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL MODERATE RISK AREAS 500-YEAR FLOODPLAIN 1 PCT DEPTH LESS THAN 1 FOOT MODERATE RISK AREAS 500-YEAR FLOODPLAIN AREA WITH REDUCED FLOOD RISK DUE TO LEVEE MODERATE RISK AREAS 500-YEAR FLOODPLAIN Crosswalk Table 2 This crosswalk table was used to populate the FHZ_LABEL field. Text description of flood zones for map legends based on the FLD_ZONE and ZONE_SUBTY fields Calculated Zone Descriptions for field FLD_ZONE = A, AE, AH, AO, AR, A99, V and VE as 1% ANNUAL CHANCE FLOOD HAZARD Calculated Zone Descriptions for field FLD_ZONE = AREA NOT INCLUDED as AREA NOT INCLUDED Calculated Zone Descriptions for field FLD_ZONE = D as AREA OF UNDETERMINED FLOOD HAZARD Calculated Zone Descriptions for field FLD_ZONE = OPEN WATER as OPEN WATER Next Calculated Zone Descriptions for field ZONE_SUBTY = 0.2 PCT ANNUAL CHANCE FLOOD HAZARD as 0.2% ANNUAL CHANCE FLOOD HAZARD 0.2 PCT ANNUAL CHANCE FLOOD HAZARD CONTAINED IN CHANNEL as 0.2% ANNUAL CHANCE FLOOD HAZARD 1 PCT DEPTH LESS THAN 1 FOOT as 0.2% ANNUAL CHANCE FLOOD HAZARD AREA OF MINIMAL FLOOD HAZARD as AREA OF MINIMAL FLOOD HAZARD AREA WITH REDUCED FLOOD RISK DUE TO LEVEE as AREA WITH REDUCED RISK DUE TO LEVEE FLOODWAY as REGULATORY FLOODWAY RIVERINE FLOODWAY SHOWN IN COASTAL ZONE as REGULATORY FLOODWAY 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. Next Deleted the following 3 features due to spatial errors: 12123C_10583 (Duplicate Polygon), 12111C_1676 (Zero Area), 12097C_502 (Negative Area). It was noted that 45 features had vertex counts greater than 500,000. Features with large vertex counts are known to cause database analysis crashes and errors. The ArcGIS Dice Tool subdivides a feature into smaller features based on a specified vertex limit. This tool is intended as a way to subdivide extremely large features that cause issues with drawing, analysis, editing, and/or performance but are difficult to split up with standard editing and geoprocessing tools. This tool should not be used in any cases other than those where tools are failing to complete successfully due to the size of features. Source: http://desktop.arcgis.com/en/arcmap/latest/tools/data-management-toolbox/dice.htm The following 45 features were subdivided using the ArcGIS Dice Tool with a vertex limit of 350,000. FLD_AR_ID = 12009C_360022, 12009C_372109, 12009C_372131, 12009C_372145, 12009C_372214, 12017C_7954, 12021C_776326, 12021C_776328, 12027C_14500, 12031C_758209, 12055C_8415, 12059C_430380, 12061C_1008, 12063C_1589, 12063C_2542, 12065C_6092, 12069C_1921, 12069C_7776, 12073C_4996, 12083C_8426, 12086C_876, 12099C_10990, 12099C_18258, 12099C_42087, 12099C_42778, 12099C_42829, 12105C_14217, 12105C_14218, 12105C_14221, 12105C_18549, 12105C_18634, 12105C_18679, 12105C_18736, 12105C_5196, 12105C_9779, 12111C_2930, 12111C_38, 12115C_10849, 12115C_11027, 12115C_1168, 12115C_3772, 12115C_442, 12115C_447, and 12133C_5475. Process Date: 20171102 Executed the following sde command: sdetable -o create_view -T DFIRM_SFHA_SV -t "DFIRM_FLDHAZ" -c "*" -w "SFHA_TF LIKE 'T'" Process Date: 20171130

MAP PROJECTION PARAMETERS:

Projection                          ALBERS
Datum                               HPGN
Units                               METERS
Spheroid                            GRS1980
1st Standard Parallel               24  0  0.000
2nd Standard Parallel               31 30  0.000
Central Meridian                   -84 00  0.000
Latitude of Projection's Origin     24  0  0.000
False Easting (meters)              400000.00000
False Northing (meters)             0.00000

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Federal Emergency Management Agency
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Flood Map Service Center

Name:                   FLORIDA GEOGRAPHIC DATA LIBRARY
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