Federal Emergency Management Agency
varies
Digital Flood Insurance Map (DFIRM) Database for Connecticut - Cross-Section Lines (XS)
FEMA-DFIRM-Final
Washington, DC
Federal Emergency Management Agency
http://www.fema.gov/msc
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Fairfield_County_09001C_20100618_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Harford_County_09003C_20110916_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Middlesex_County_09007C_20080828_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_New_London_County_09011C_20110718_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_NewHaven_County_09009C_20101217_metadata.htm
http://www.fema.gov/library/viewRecord.do?id=2206
http://www.cteco.uconn.edu/metadata/fema/document/frm_selected_pages_from_Appendix_L.PDF
Includes location and attributes for Cross-Section Lines (XS) shown on Digital Flood Insurance Rate (DFIRM) maps available for five Connecticut counties. See below for time period of each county DFIRM Database included in this statewide XS layer. More current data may be available from the Federal Emergcy Management Agency (FEMA). The 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.
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.
In Guidelines and Specifications for Flood Hazard Mapping Partners (http://www.fema.gov/library/viewRecord.do?id=2206), FEMA defines technical requirements, product specifications for Flood Hazard Maps and related National Flood Insurance Program (NFIP) products, and associated coordination and documentation activities.
20100618
20110916
20080828
20110718
20101217
FIRM and FIS effective date for Fairfield, Hartford, Middlesex, New London, and New Haven Counties, respectively.
Unknown
-73.689527
-71.787869
42.037426
41.005326
ISO 19115 Topic Category
elevation
environment
hydrogrology
inlandWaters
oceans
structure
transportation
FEMA NFIP Topic Category
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
None
Fairfield County
Hartford County
Middlesex County
New London County
New Haven County
None.
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.
Federal Emergency Management Agency
mailing address
500 C Street, S.W.
Washington
District of Columbia
20472
USA
1-800-358-9616
http://www.fema.gov/msc
http://www.cteco.uconn.edu/metadata/fema/browsegraphic/fema_dfirmfullview.gif
Full view of DFIRM for Connecticut with data available for Fairfield, Hartford, Middlesex, New London, and New Haven counties.
GIF
http://www.cteco.uconn.edu/metadata/fema/browsegraphic/fema_dfirmdetailview.jpg
Detail view of DFIRM Database with standard FEMA symbology
JPEG
http://www.cteco.uconn.edu/metadata/fema/browsegraphic/fema_dfirmcolorsymbologydetailview.jpg
Detail view of DFIRM Database with color symbology applied by CT DEEP
JPEG
http://www.cteco.uconn.edu/metadata/fema/browsegraphic/fema_firm_legend.gif
Legend for FEMA Flood Insurance Rate Maps (FIRM)
GIF
http://www.cteco.uconn.edu/metadata/fema/browsegraphic/fema_firm_notes_to_users.gif
Notes to users included on FEMA Flood Insurance Rate Maps (FIRM)
GIF
None
None
No restrictions for handling the data.
Original data development environment varies. Finishing of the data is done using ESRI's ArcGIS software.
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 process 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.
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 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.
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.
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
Federal Emergency Management Agency
Connecticut County DFIRM Database
FEMA-DFIRM-Final
Washington, DC
Federal Emergency Management Agency
DFIRM Database publiciation dates vary according to county
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Fairfield_County_09001C_20100618_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Fairfield_County_09001C_20100618_metadata.xml
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Harford_County_09003C_20110916_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Harford_County_09003C_20110916_metadata.xml
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Middlesex_County_09007C_20080828_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_Middlesex_County_09007C_20080828_metadata.xml
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_New_London_County_09011C_20110718_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_New_London_County_09011C_20110718_metadata.xml
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_NewHaven_County_09009C_20101217_metadata.htm
http://www.cteco.uconn.edu/metadata/fema/document/DFIRM_Connecticut_NewHaven_County_09009C_20101217_metadata.xml
disc
20100618
20110916
20080828
20110718
20101217
FIRM and FIS effective date for Fairfield, Hartford, Middlesex, New London, and New Haven Counties, respectively.
County DFIRM
Connecticut statewide DFIRM Database
disc
Connecticut DFIRM
Appended and added together available county-level DFIRM data to create a statewide feature class for Connecticut for use by the Connecticut Department of Energy and Environmental Protection.
County DFIRM
20110901
Connecticut DFIRM
Connecticut Department of Energy and Environmental Protection
Courtney Larson
mailing and physical address
79 Elm Street
Hartford
Connecticut
06106
USA
860-424-3540
Vector
String
9877
Lambert Conformal ConicLambert Conformal Conic41.20000041.866667-72.75000040.833333999999.999996499999.999998
coordinate pair
0.000328
0.000328
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
1.000000
Explicit elevation coordinate included with horizontal coordinates
XS
Base Flood Elevation Lines. See http://www.cteco.uconn.edu/metadata/fema/document/frm_selected_pages_from_Appendix_L.pdf for attribute definitions.
Federal Emergency Management Agency
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
XS_LN_ID
XS_LTR
START_ID
STREAM_STN
XS_LN_TYP
WTR_NM
WSEL_REG
LEN_UNIT
V_DATUM
SOURCE_CIT
VELOCITY
VEL_UNIT
BED_ELEV
TOP_WIDTH
XS_AREA
AREA_UNIT
Shape
Feature geometry.
ESRI
Coordinates defining the features.
Shape.len
The DFIRM Database 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.
Appendix L of FEMA's Guidelines and Specifications for FEMA Flood Hazard Mapping Partners contains a detailed description of each attribute code and a reference to other relevant information.
The following tables are included in this data set: l_comm_info l_mt1_lomc l_stn_start study_info s_bfe s_cbrs s_base_index s_firm_pan s_fld_haz_ar s_fld_haz_ln s_gen_struct s_label_pt s_label_ld s_perm_bmk s_pol_ar s_pol_ln s_quad_index s_wtr_ln s_xs
FEMA, Map Service Center
mailing address
P.O. Box 1038
Jessup
Maryland
20794-1038
USA
1-800-358-9616
http://www.fema.gov/msc
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.
DFIRM_S_XS
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.
20111227
Federal Emergency Management Agency
MipHelp (subsequently modified by Howie Sternberg, CT DEEP, to describe the Connecticut DFIRM data based on the county-level DFIRM database)
mailing address
500 C Street, s.w
Washington
District of Columbi
1-877-336-2627
USA
1-877-336-2627
miphelp@riskmapcds.com
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None. No restrictions or legal prerequisites for accessing the metadata.
None. No restrictions or legal prerequisites for using the metadata after access is granted.
None
None
No restrictions for handling the metadata.
http://hazards.fema.gov
http://www.epsg.org
FEMA NFIP Metadata Content and Format Standard
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile