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 Insrance 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 UTM 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 FLOODPLAIN, CLAY COUNTY, KS, USA
publication Date
2011-10-19
presentationForm
FEMA-DFIRM-FLOODPLAIN
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, mitigaion, 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 establishement 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.
Constraints on resource usage:
Legal Constraints
use constraint:
otherRestrictions
Other constraints
Use Constraints: Acknowledgement 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.
source description
Source Contribution: This dataset is used for the identification of information developed for the current Flood Map Project.
(S_FLD_HAZ_AR).Source Type paper
source citation
Title DFIRM Flood Hazard Area
publication Date
2011-10-19
cited responsible party
-
originator
organisation Name
AMEC Earth and Environmental
Resource extent
Temporal Extent
2011-10-19
source
source description
Source Contribution: This dataset is used for identification of permanent benchmarks (S_Perm_Bmk).Source Type online
source citation
Title Permanent Benchmarks
publication Date
2011-10-19
cited responsible party
-
originator
organisation Name
National Geodetic Survey
Resource extent
Temporal Extent
2011-10-19
source
source description
Source Contribution: This dataset is used for identification of stream features (S_Wtr_Ln).Source Type online
source citation
Title NHD Base Features
publication Date
2011-10-19
cited responsible party
-
originator
organisation Name
USGS National Hydrography Dataset (NHD)
Resource extent
Temporal Extent
2011-10-19
Completeness Commission
evaluation Method Description
Data contained in the Floodplain Mapping and Redelineation 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 Floodplain Mapping and Redelineation 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.
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 FEMA
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