DIGITAL FLOOD INSURANCE RATE MAP DATABASE, City of Chesapeake, Independent City, VIRGINIA

Dataset Identification:

Resource 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.
Citation
Title DIGITAL FLOOD INSURANCE RATE MAP DATABASE, City of Chesapeake, Independent City, VIRGINIA
publication  Date   2014-12-16
presentationForm  FEMA-DFIRM-FINAL
cited responsible party - publisher
organisation Name  Federal Emergency Management Agency
Contact information
Address
, Washington, DC
cited responsible party - originator
organisation Name  Federal Emergency Management Agency
cited responsible party - originator
organisation Name  Federal Emergency Management Agency
cited responsible party -
organisation Name  
Contact information
Linkage for online resource
URL: https://msc.fema.gov
Topic Category:  elevation,environment,hydrology,inlandwaters,structure,transportation
Keywords:
Theme keywords (theme):
Base Flood Elevation
CBRS
Coastal Barrier Resources System
Coastal Flooding
DFIRM
DFIRM Database
Digital Flood Insurance Rate Map
FEMA Flood Hazard Zone
FIRM
Flood Insurance Rate Map
Floodway
NFIP
Riverine flooding
SFHA
Special Flood Hazard Area
thesaurus name >
Title FEMA NFIP Topic Category
Location keywords:
REGION 03
STATE VA
COUNTY Chesapeake City
COUNTY-FIPS 51550
COMMUNITY City of Chesapeake
FEMA-CID 510034
thesaurus name >
Title None
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.
Resource language:  eng; USA
Resource progress code:  completed
Resource Maintenance Information
maintenance or update frequency:  unknown
Constraints on resource usage:
Constraints
Use limitation statement:
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.
Constraints on resource usage:
Legal Constraints
use constraint:  otherRestrictions
Other constraints
Use Constraints: 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.
Constraints on resource usage:
Legal Constraints
Access Constraints  otherRestrictions
Other constraints
Access Constraints: None
Spatial representation type code:  vector
Processing environment:  Native Dataset Environment: Original data development environment varies. Finishing of the data is done using ESRI's ArcGIS software.
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude  -76.533
eastBoundLongitude  -75.978
northBoundLatitude  36.891
southBoundLatitude  36.487
Temporal Extent
2014-12-16
point of contact - pointOfContact
organisation Name  Federal Emergency Management Agency
Contact information
Telephone
Voice 1-877-336-2627
Address
500 C Street, S.W., Washington, District of Columbia, 20472 Country USA
electronic Mail Address miphelp@riskmapcds.com
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Vector spatial representation information

Geometric Objects
geometric Object Type  POINT STRING GT-POLYGON COMPOSED OF CHAINS
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Content information: feature catalog description

Included With Dataset  true
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Scope of quality information
scope level  dataset
Resource lineage description
source
source description  Source Contribution: Location of roads, railroads, bridges, streams, and other physical features.Source Type On-line
representative resolution scale:
Scale denominator: 6000
source citation
Title Digital Orthophotography
publication  Date   2009-12-03
presentationForm  REMOTE SENSING IMAGE
other Citation Details  Source imagery for base map and stream locations
cited responsible party - publisher
organisation Name  Virginia Geographic Information Network
Contact information
Address
, Richmond Virginia
cited responsible party - originator
organisation Name  Virginia Geographic Information Network
Resource extent
Temporal Extent
2009-12-03
source
source description  Source Contribution: Grid of DFIRM panels.Source Type Digitized
representative resolution scale:
Scale denominator: 12000
source citation
Title City of Chesapeake Virginia Digital Flood Insurance Rate Map
publication  Date   2013-04-04
presentationForm  mapDigital
other Citation Details  Grid of FIRM panels created for this Flood Insurance Study.
cited responsible party - publisher
organisation Name  Federal Emergency Management Agency
Contact information
Address
, Washington, D.C.
cited responsible party - originator
organisation Name  Federal Emergency Management Agency
Resource extent
Temporal Extent
2013-04-04
source
source description  Source Contribution: National Geodetic Survey reference points (bench marks).Source Type On-line
representative resolution scale:
Scale denominator: 24000
source citation
Title Geodetic bench mark positions and descriptions
publication  Date   2004-01-01
presentationForm  mapDigital
other Citation Details  The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data in the National Spatial Reference System. These geodetic data include bench marks and other control points that provide the base of reference for latitude, longitude, height, scale, orientation, and gravity measurements used throughout the United States.
cited responsible party - publisher
organisation Name  National Geodetic Survey
Contact information
Address
, Silver Spring, MD
cited responsible party - originator
organisation Name  National Geodetic Survey
Resource extent
Temporal Extent
2004-01-01
source
source description  Source Contribution: Location of political entities.Source Type On-line
representative resolution scale:
Scale denominator: 6000
source citation
Title Political Boundaries
publication  Date   2009-12-03
presentationForm  mapDigital
other Citation Details  Political areas
cited responsible party - publisher
organisation Name  Virginia Geographic Information Network
Contact information
Address
, Richmond Virginia
cited responsible party - originator
organisation Name  Virginia Geographic Information Network
Resource extent
Temporal Extent
2009-12-03
source
source description  Source Contribution: Grid of USGS 7.5-Minute Series Topographic Maps.Source Type On-line
representative resolution scale:
Scale denominator: 24000
source citation
Title 7.5-Minute Quadrangle Grid
publication  Date   2002-12-01
presentationForm  mapDigital
other Citation Details  Grid of USGS 7.5-Minute Series Topographic Maps.
cited responsible party - publisher
organisation Name  ESRI
Contact information
Address
, Redlands, CA
cited responsible party - originator
organisation Name  U.S. Geological Survey
Resource extent
Temporal Extent
2002-12-01
source
source description  Source Contribution: Spatial and attribute information for Water features.Source Type Paper
representative resolution scale:
Scale denominator: 6000
source citation
Title Flood Insurance Study
publication  Date   2013-02-20
presentationForm  MAP AND REPORT
other Citation Details  Detailed coastal flood hazard analyses were performed for several flooding sources. The Federal Emergency Management Agency (FEMA), Region III office, initiated a study in 2008 to update the coastal storm surge elevations within the states of Virginia, Maryland, and Delaware, and the District of Columbia including the Atlantic Ocean, Chesapeake Bay including its tributaries, and the Delaware Bay. The storm surge study was conducted for FEMA by the US Army Corps of Engineers (USACE) and its project partners under Project HSFE03-06-X-0023, NFIP Coastal Storm Surge Model for Region III and Project HSFE03-09-X-1108, Phase II Coastal Storm Surge Model for FEMA Region III.
cited responsible party - publisher
organisation Name  Federal Emergency Management Agency
Contact information
Address
, Washington, D.C.
cited responsible party - originator
organisation Name  Federal Emergency Management Agency
Resource extent
Temporal Extent
2013-02-20
source
source description  Source Contribution: Spatial and attribute information for Floodplains.Source Type Digitized
representative resolution scale:
Scale denominator: 24000
source citation
Title City of Chesapeake Virginia Digital Flood Insurance Rate Map
publication  Date   2013-02-20
presentationForm  mapDigital
other Citation Details  Detailed coastal flood hazard analyses were performed for several flooding sources. The Federal Emergency Management Agency (FEMA), Region III office, initiated a study in 2008 to update the coastal storm surge elevations within the states of Virginia, Maryland, and Delaware, and the District of Columbia including the Atlantic Ocean, Chesapeake Bay including its tributaries, and the Delaware Bay. The storm surge study was conducted for FEMA by the US Army Corps of Engineers (USACE) and its project partners under Project HSFE03-06-X-0023, NFIP Coastal Storm Surge Model for Region III and Project HSFE03-09-X-1108, Phase II Coastal Storm Surge Model for FEMA Region III.
cited responsible party - publisher
organisation Name  Federal Emergency Management Agency
Contact information
Address
, Washington, D.C.
cited responsible party - originator
organisation Name  Federal Emergency Management Agency
Resource extent
Temporal Extent
2013-02-20
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description  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.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description  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 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 process that produces these data are available in the Guidelines and Specifications for Flood Hazard Mapping Partners. Vertical 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.
Completeness Commission
evaluation Method Description  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.
Completeness Omission
evaluation Method Description  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.
ConceptualConsistency
measure Description  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.

Resource distribution information

Distributor
distributor contact - distributor
organisation Name  FEMA, Map Service Center
Contact information
Telephone
Voice 1-877-336-2627
Address
P.O. Box 3617, Oakton, Virginia, 22124 Country USA
electronic Mail Address miphelp@riskmapcds.com
contact Instructions
Data requests must include the full name of the community or county and the FIRM panel number(s) or the 7.5- minute series quadrangle sheet area(s) covered by the request.
Standard ordering process
fees Contact Distributor
Format
Format name ARCE
Format version 
Format
Format name ESRI Shapefile
Format version 
Format
Format name MapInfo Interchange file (MIF)
Format version 
Format
Format name ARCE
Format version 
Format
Format name MapInfo Interchange file (MIF)
Format version 
Format
Format name ESRI Shapefile
Format version 
Digital Transfer Options
Linkage for online resource
URL: https://msc.fema.gov
Linkage for online resource
URL: https://msc.fema.gov
Linkage for online resource
URL: https://msc.fema.gov
Digital Transfer Options
Medium of distribution
name  cdRom
medium Format  ISO 9600 ISO 9600 ISO 9600

Metadata data stamp:  2013-06-12
Resource Maintenance Information
maintenance or update frequency:  annually
notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
Metadata contact - pointOfContact
individual Name MipHelp
organisation Name  Federal Emergency Management Agency
Contact information
Telephone
Voice 1-877-336-2627
Address
500 C Street, S.W., Washington, District of Columbia, 20472 Country USA
electronic Mail Address miphelp@riskmapcds.com
Metadata scope code  dataset
Metadata language  eng; USA
Metadata character set encoding:   utf8
Metadata standard for this record:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
standard version:  ISO 19115-2:2009(E)
Metadata record identifier:  4a5d3a0e-0d46-4ad2-a07a-119ffb75b688

Metadata record format is ISO19139-2 XML (MI_Metadata)