fema - base flood elevation lines

Data format: SDE Feature Class

File or table name: fema_bfe

Theme keywords: inlandWaters, FEMA Flood Hazard Zone, DFIRM, Digital Flood Insurance Rate Map, Special Flood Hazard Area, DFIRM Database, NFIP, SFHA, Flood Insurance Rate Map, FIRM, Riverine flooding, Floodway, Base Flood Elevation, Coastal flooding

Abstract: 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, the 0.2-percent-annual-chance flood event, 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 the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the State Plane projection and coordinate system.The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

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:


Citation:
Citation information:
Originators: Federal Emergency Management Agency (FEMA)


Title:
fema - base flood elevation lines
*File or table name: fema_bfe


Publication date: 20080926
*Geospatial data presentation form: vector digital data


Publication information:
Publication place: Washington, DC
Publisher: Federal Emergency Management Agency

Other citation details:
Metadata_File_Name: 06055C_final_metadata.txt


Online linkage: http://gis.napa.ca.gov/giscatalog/catalog.asp


Description:
Abstract:
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, the 0.2-percent-annual-chance flood event, 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 the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the State Plane projection and coordinate system.The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

Purpose:
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 DFIRM Database presents the flood risk information depicted on the FIRM in a digital format suitable for use in electronic mapping applications. The DFIRM database is a subset of the Digital FIS database that serves to archive the information collected during the FIS.

Supplemental information:
Use_Constraints by FEMA:
The hardcopy FIRM and DFIRM and the accompanying FISs 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 matches the hardcopy map exactly.  However the hardcopy flood maps and flood profiles are the authoritative documents for the NFIP.
Acknowledgement of FEMA would be appreciated in products derived from these data.

*Language of dataset: en


Time period of content:
Time period information:
Single date/time:
Calendar date: 20080926

Currentness reference:
publication date

Status:
Progress: In work
Maintenance and update frequency: Irregular

Spatial domain:
Bounding coordinates:
*West bounding coordinate: -122.601203
*East bounding coordinate: -122.232653
*North bounding coordinate: 38.604313
*South bounding coordinate: 38.221986

Local bounding coordinates:
*Left bounding coordinate: 6389859.904790
*Right bounding coordinate: 6494826.580026
*Top bounding coordinate: 1981985.836215
*Bottom bounding coordinate: 1843228.917863

Keywords:
Theme:
Theme keywords: inlandWaters
Theme keyword thesaurus: ISO 19115 Topic Category

Theme:
Theme keywords: FEMA Flood Hazard Zone, DFIRM, Digital Flood Insurance Rate Map, Special Flood Hazard Area, DFIRM Database, NFIP, SFHA, Flood Insurance Rate Map, FIRM, Riverine flooding, Floodway, Base Flood Elevation, Coastal flooding
Theme keyword thesaurus: none

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

Access constraints: Access to this data is limited to County of Napa and partner agencies only.
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 person: Drew Lander
Contact organization: County of Napa Public Works
Contact position: Assistant Engineer


Contact address:
Address type: mailing and physical address
Address:
1195 3rd St
City: Napa
State or province: CA
Postal code: 94559
Country: USA

Contact voice telephone: (707) 253-4892


Contact electronic mail address: dlander@co.napa.ca.us


Hours of service: M-F 8:00 am - 5:00 pm



*Native dataset format: SDE Feature Class
*Native data set environment:
Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3000


Cross reference:
Citation information:
Title:
fema flood zones


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Data Quality Information:


Attribute accuracy:
Attribute accuracy report:
The DFIRM Database consists of countywide vector files and associated attributes produced in conjunction with the hard copy FEMA FIRM. The published effective FIRM and DFIRM maps 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 proces that produces these data are available in the Guidelines and Specifications for Flood Hazard Mapping Partners.  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 FEMA's DFIRM database 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 report that accompanies this DFIRM database.
Users should be aware that BFEs shown in the S_BFE table 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.

Logical consistency report:
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.

Completeness report:
Data contained in the DFIRM Database files reflect 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. Both detailed and approximate analyses are employed. Generally, detailed analyses are used to generate flood risk data only for developed or developing areas of communities. For areas where little or no development is expected to occur, FEMA uses approximate analyses to generate flood risk data. Typically, only drainage areas that are greater than one square mile are studied.

Positional accuracy:
Horizontal positional accuracy:
Horizontal positional accuracy report:
The DFIRM Database consists of countywide vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and DFIRM 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 Specifications for Flood Hazard Mapping Partners.  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 FEMA's DFIRM database was also performed.

Vertical positional accuracy:
Vertical positional accuracy report:
The DFIRM Database consists of countywide vector files and associated attributes produced in conjunction with the hardcopy FEMA FIRM. The published effective FIRM and DFIRM 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 Specifications for Flood Hazard Mapping Partners.  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 FEMA's DFIRM database was also performed.

Lineage:
Source information:
Source citation:
Citation information:
Originators: Federal Emergency Management Agency (FEMA)


Title:
fema


Publication date: 2008


Source scale denominator: Unknown

Process step:
Process description:
Received CD with data from Drew Lander; loaded data into SDE

Process date: 20080918


Process step:
Process description:
Metadata imported.

Process date: 20080918


Source used citation abbreviation:
c:\documents and settings\gisadmin\desktop\fema.xml


Process step:
Process description:
Dataset copied.

Process date: 20080918


Process step:
Process description:
Dataset copied.

Process date: 20110125
Process time: 15440700


Source used citation abbreviation:
server=gisdata_test; service=sde:sqlserver:gisdata_test; database=maingis; user=gis; version=sde.default


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Spatial Data Organization Information:


*Direct spatial Rreference method: Vector


Point and vector object information:
ESRI terms description:
*Name: fema_bfe
*ESRI feature type: Simple
*ESRI feature geometry:
*ESRI topology: FALSE
*ESRI feature count: 529
*Spatial index: TRUE
*Linear referencing: FALSE


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Spatial Reference Information:


Horizontal coordinate system definition:
Coordinate system name:
*Projected coordinate system name: NAD_1983_StatePlane_California_II_FIPS_0402_Feet
*Geographic coordinate system name: GCS_North_American_1983

Planar:
Planar coordinate information:
*Planar coordinate encoding method: coordinate pair
Coordinate representation:
*Abscissa resolution: 0.000328
*Ordinate resolution: 0.000328
*Planar distance units: survey feet

Geodetic model:
*Horizontal datum name: North American Datum of 1983
*Ellipsoid name: Geodetic Reference System 80
*Semi-major axis: 6378137.000000
*Denominator of flattening ratio: 298.257222

Vertical coordinate system definition:
Altitude system definition:
*Altitude resolution: 1.000000
*Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates

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Entity and Attribute Information:


Detailed description:
*Name: fema_bfe


Entity type:
*Entity type label: fema_bfe
*Entity type type: Feature Class
*Entity type count: 529
Entity type definition:
FEMA Flood Zones
Entity type definition source:
Dataset Developer

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: V_DATUM
Attribute definition:
Feature geometry.
Attribute definition source:
ESRI

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


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


Attribute:
*Attribute label: V_DATUM
*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: Shape
*Attribute alias: LEN_UNIT
Attribute definition:
Feature geometry.
Attribute definition source:
ESRI

*Attribute type: String
*Attribute width: 20
*Attribute precision: 0
*Attribute scale: 0


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


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


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


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


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


Attribute:
*Attribute label: BFE_LN_ID
*Attribute alias: ELEV


*Attribute type: Double
*Attribute width: 8
*Attribute precision: 14
*Attribute scale: 2


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


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


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Distribution Information:


Distributor:
Contact information:
Contact organization primary:
Contact organization: County of Napa ITS Department
Contact position: GIS Coordinator


Contact address:
Address type: mailing and physical address
Address:
650 Imperial Way #201
City: Napa
State or province: CA
Postal code: 94559
Country: USA

Contact voice telephone: (707) 259-8141
Contact facsimile telephone: (707) 253-4824


Contact electronic mail address: gisstaff@co.napa.ca.us


Hours of service: M-F 8:00 am - 5:00 pm



Resource description: downloadable data


Distribution liability:
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.

Standard order process:
Fees: none for digital form
Ordering instructions:
All available layers are located in the Data Catalog on the website http://gis.napa.ca.gov/gisdata.asp.
You can download the available layers by Registering, then returning to the site to download.


Custom order process:
Go to website http://gis.napa.ca.gov/gisdata.asp to request CD by mail for an additional fee.


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Metadata Reference Information:


*Metadata date: 20110330


*Language of metadata: en


Metadata contact:
Contact information:
Contact organization primary:
Contact organization: County of Napa ITS Department
Contact position: GIS Coordinator


Contact address:
Address type: mailing and physical address
Address:
650 Imperial Way #201
City: Napa
State or province: CA
Postal code: 94559
Country: USA

Contact voice telephone: (707) 259-8141
Contact facsimile telephone: (707) 253-4824


Contact electronic mail address: gisstaff@co.napa.ca.us


Hours of service: M-F 8:00 am - 5:00 pm



*Metadata standard name: FGDC Content Standards for Digital Geospatial Metadata
*Metadata standard version: FGDC-STD-001-1998
*Metadata time convention: local time


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Metadata stylesheets are provided courtesy of ESRI. Copyright (c) 2000-2002, Environmental Systems Research Institute, Inc. All rights reserved.