Final Digital Flood Insurance Database Submission for Acadia Parish, LA, USA
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 Lambert Conformal Conic projection and the Louisiana State Plane NAD83 South Zone coordinate
system. The specifications for the horizontal control of Base Map data files are consistent with those required for mapping
at a scale of 1:24,000
Citation
Title Final Digital Flood Insurance Database Submission for Acadia Parish, LA, USA
publication Date
2010-11-26
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
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:
underDevelopment
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: Acknowledgment of FEMA would be appreciated in products derived from these data. This digital data is produced
for the purposes of updating/creating a DFIRM database
Constraints on resource usage:
Legal Constraints
Access Constraints
otherRestrictions
Other constraints
Access Constraints: None
Spatial representation type code:
vector
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude
-93.1166
eastBoundLongitude
-92.1192
northBoundLatitude
30.5052
southBoundLatitude
29.7585
Temporal Extent
2010-11-26
point of contact
-
pointOfContact
organisation Name
Federal Emergency Management Agency
Contact information
Telephone
Voice 1-800-358-9616
Address
500 C Street, S.W., Washington, District of Columbia, 20472
Country USA
source description
Source Contribution: Spatial and attribute information, floodplain widths, BFEs, floodplain location.Source Type paper
source citation
Title Flood Insurance Study Report, Acadia Parish, LA, USA and Incorporated areas.
publication Date
2010-11-26
cited responsible party
-
originator
organisation Name
Federal Emergency Management Agency.
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_FIRM_PAN represents spatial and attribute information for the Flood Insurance Rate Map (FIRM) panel
area for Acadia Parish, LA. S_POL_LN represents the political boundaries and metropolitan areas in line format for Acadia
Parish, LA. S_PLSS_LN file represents Public Land Survey System (PLSS) section boundaries as polylines in Acadia Parish, LA.
S_BFE represnts spatial and attribute information for Base Flood Elevations of Acadia Parish, LA. S_GEN_STRUCT contains information
about the hydraulic structures within the Acadia Parish, LA. S_FLD_HAZ_AR contains information about the flood hazard polygon
features for Acadia Parish, LA. S_FLD_HAZ_LN contains information about the flood hazard line features for Acadia Parish,
LA. S_PROFIL_BASLN contains information about the streamlines used to develop the effective profile information. S_STN_START
contains location and attribute information for station points for Acadia Parish, LA. S_XS represents location and attributes
for cross-section lines in the area covered by the DFIRM for the Acadia Parish, LA.Source Type MIP
source citation
Title DFIRM Database for Acadia Parish, LA, USA and Incorporated Areas
publication Date
2010-11-26
cited responsible party
-
originator
organisation Name
FTN Associates Ltd
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_QUAD_INDEX represents spatial and attribute information for the index of the USGS 7.5-Minute Series
Topographic Quadrangle Map boundaries for Acadia Parish, LA.Source Type DIGITAL
source citation
Title S_QUAD_INDEX for Acadia Parish, LA
publication Date
2010-11-26
cited responsible party
-
publisher
organisation Name
U.S. Geological Survey
Contact information
Address
, Reston, VA
cited responsible party
-
originator
organisation Name
U.S. Geological Survey (USGS)
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_Trnsport_Ln represents selected Flood Insurance Study road centerlines as lines within Acadia Parish,
LA.Source Type DIGITAL
source citation
Title Road centerlines for Acadia Parish, LA.
publication Date
2010-11-26
cited responsible party
-
originator
organisation Name
US Department of Commerce (US Census Bureau)
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_WTR_AR and S_WTR_LN represents selected Flood Insurance Study water bodies as polygons and lines for
Acadia Parish, LA.Source Type DIGITAL
source citation
Title Water Polygons and Lines Multi-names for Acadia Parish, LA
publication Date
2010-11-26
cited responsible party
-
publisher
organisation Name
U.S. Geological Survey
Contact information
Address
, Reston, Virginia
cited responsible party
-
originator
organisation Name
NATIONAL HYDROGRAPHY DATASET (NHD)
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_PERM_BMK represents the location and attributes for bench marks on the DFIRM for Acadia Parish, LA.Source
Type DIGITAL
source citation
Title S_PERM_BMK for Acadia Parish, LA.
publication Date
2007-10-12
cited responsible party
-
publisher
organisation Name
NGS Information Services
Contact information
Address
, Silver Springs, MD
cited responsible party
-
originator
organisation Name
NATIONAL GEODETIC SURVEY (NGS)
Resource extent
Temporal Extent
2010-11-26
source
source description
Source Contribution: S_POL_AR represents the political boundaries and incorporated communities in Acadia Parish, LA.Source
Type DIGITAL
source citation
Title Political boundaries for Acadia Parish, LA.
publication Date
2010-11-26
cited responsible party
-
publisher
organisation Name
LOUISIANA OIL SPILL COORDINATOR'S OFFICE (LOSCO)
Contact information
Address
, Baton Rouge, LA
cited responsible party
-
originator
organisation Name
LOUISIANA OIL SPILL COORDINATOR'S OFFICE (LOSCO)
Resource extent
Temporal Extent
2007-11-23
source
source description
Source Contribution: S_PLSS_AR represents location and attributes of sections, townships and ranges for Acadia Parish, LA.Source
Type DIGITAL
source citation
Title PLSS polygons for Acadia Parish, LA.
publication Date
2009-06-26
cited responsible party
-
publisher
organisation Name
ACADIA PARISH ASSESSOR
Contact information
Address
, Crowley, LA
cited responsible party
-
originator
organisation Name
ACADIA PARISH ASSESSOR
Resource extent
Temporal Extent
1995-01-01
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description
The DFIRM Database consists of community based 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 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 DFIRM database was also performed.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description
The DFIRM Database consists of community based 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 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 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.
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.
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 Gary Zimmerer
organisation Name
Federal Emergency Management Agency
position Name FEMA Region VI Lead
Contact information
Telephone
Voice 1-800-358-9616
Address
500 C Street, S.W., Washington, District of Columbia, 20472
Country USA