Theme keywords: flood, FEMA, FEMA, flood zone, elevation, inlandwaters

Abstract: 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.

FGDC and ESRI Metadata:

Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.

Identification Information:


Description:
Abstract:
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.

Purpose:
The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published 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. The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.

Keywords:
Theme:
Theme keywords: flood, FEMA, FEMA, flood zone, elevation, inlandwaters
Theme keyword thesaurus: ISO 19115 Topic Category

Place:
Place keywords: Napa County
Place keyword thesaurus: Geographic Names Information System

Access constraints: Access to this data is limited to County of Napa and partner agencies only. Download the FEMA flood data directly @ https://www.fema.gov/national-flood-hazard-layer-nfhl
Use constraints:
Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information.  Although every reasonable effort has been made to assure the accuracy of this data, the County of Napa makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. The County of Napa assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.

Point of contact:
Contact information:
Contact organization primary:
Contact organization: Federal Emergency Management Agency

Contact voice telephone: 1-877-336-2627


Contact electronic mail address: mscservices@riskmapcds.com


Data set credit:
FEMA (Federal Emergency Management Agency)

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Data Quality Information:


Lineage:
Process step:
Process description:
Updated metadata

Process date: 20161228


Process contact:
Contact information:
Contact person primary:
Contact person: Matt Lamborn
Contact organization: Napa County Planning, Building, and Environmental Services Dept.
Contact position: Planner III/GIS


Contact voice telephone: (707) 265-2326


Contact electronic mail address: matt.lamborn@countyofnapa.org


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Spatial Data Organization Information:


Point and vector object information:
ESRI terms description:
*Name: fema_floodzones
*ESRI feature type: Simple
*ESRI feature geometry:
*ESRI topology: FALSE
*ESRI feature count: 726
*Spatial index: TRUE
*Linear referencing: FALSE


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Entity and Attribute Information:


Detailed description:
*Name: fema_floodzones


Entity type:
*Entity type label: fema_floodzones
*Entity type type: Feature Class
*Entity type count: 726

Attribute:
*Attribute label: OBJECTID
*Attribute alias: OBJECTID
*Attribute definition:
Internal feature number.
*Attribute definition source:
Esri

*Attribute type: OID
*Attribute width: 4
*Attribute precision: 10
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Sequential unique whole numbers that are automatically generated.


Attribute:
*Attribute label: Shape
*Attribute alias: Shape
*Attribute definition:
Feature geometry.
*Attribute definition source:
Esri

*Attribute type: Geometry
*Attribute width: 4
*Attribute precision: 0
*Attribute scale: 0


Attribute domain values:
*Unrepresentable domain:
Coordinates defining the features.


Attribute:
*Attribute label: DFIRM_ID
*Attribute alias: DFIRM_ID


*Attribute type: String
*Attribute width: 6
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: VERSION_ID
*Attribute alias: VERSION_ID


*Attribute type: String
*Attribute width: 11
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: FLD_AR_ID
*Attribute alias: FLD_AR_ID


*Attribute type: String
*Attribute width: 32
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: STUDY_TYP
*Attribute alias: STUDY_TYP


*Attribute type: String
*Attribute width: 28
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: FLD_ZONE
*Attribute alias: FLD_ZONE


*Attribute type: String
*Attribute width: 17
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: ZONE_SUBTY
*Attribute alias: ZONE_SUBTY


*Attribute type: String
*Attribute width: 57
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: SFHA_TF
*Attribute alias: SFHA_TF


*Attribute type: String
*Attribute width: 1
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: SOURCE_CIT
*Attribute alias: SOURCE_CIT


*Attribute type: String
*Attribute width: 21
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: STATICBFE
*Attribute alias: STATICBFE


*Attribute type: Integer
*Attribute width: 4
*Attribute precision: 10
*Attribute scale: 0


Attribute:
*Attribute label: DEPTH_FT
*Attribute alias: DEPTH_FT


*Attribute type: Integer
*Attribute width: 4
*Attribute precision: 10
*Attribute scale: 0


Attribute:
*Attribute label: Shape_STArea__
*Attribute alias: Shape_STArea__


*Attribute type: Double
*Attribute width: 8
*Attribute precision: 38
*Attribute scale: 8


Attribute:
*Attribute label: Shape_STLength__
*Attribute alias: Shape_STLength__


*Attribute type: Double
*Attribute width: 8
*Attribute precision: 38
*Attribute scale: 8


Attribute:
*Attribute label: FLOODZN
*Attribute alias: FLOODZN


*Attribute type: String
*Attribute width: 30
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: Shape.STArea()
*Attribute alias: Shape.STArea()


*Attribute type: Double
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Attribute:
*Attribute label: Shape.STLength()
*Attribute alias: Shape.STLength()


*Attribute type: Double
*Attribute width: 0
*Attribute precision: 0
*Attribute scale: 0


Overview description:
Entity and attribute overview:
The NFHL 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.

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