Digital Flood Insurance Rate Map Database, St.Mary's County, Maryland, USA

Metadata Updated: November 14, 2017

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 Universal Transverse Mercator Zone 18 North. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000. Coastal study data as defined in FEMA Gudelines and Specifications, Appendix D: Guidance for Coastal Flooding Analyses and Mapping, submitted as a result of a coastal study. Appendix D notes that a variety of analytical methodologies may be used to establish Base (1-percent-annual-chance) Flood Elevations (BFEs) and floodplains throughout coastal areas of the United States. Appendix D itemizes references for the methodologies currently in use by FEMA for specific coastal flood hazards, provides general guidance for documentation of a coastal flood hazard analysis, specifies flood hazard analysis procedures for the Great Lakes coasts, and outlines intermediate data submissions for coastal flood hazard analyses with new storm surge modeling and revised stillwater flood level (SWFL). (Source: FEMA Guidelines and Specs, Appendix D Guidance for Coastal Flooding Analyses and Mapping, Section D.1)

Access & Use Information

Downloads & Resources

Dates

Metadata Date November 19, 2014
Metadata Created Date November 14, 2017
Metadata Updated Date November 14, 2017
Reference Date(s) November 19, 2014 (publication)
Frequency Of Update unknown

Metadata Source

Harvested from FEMA-R03

Additional Metadata

Resource Type Dataset
Metadata Date November 19, 2014
Metadata Created Date November 14, 2017
Metadata Updated Date November 14, 2017
Reference Date(s) November 19, 2014 (publication)
Responsible Party Federal Emergency Management Agency (Point of Contact)
Contact Email
Access 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 match 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., Access Constraints: None
Bbox East Long -76.088
Bbox North Lat 38.655
Bbox South Lat 37.851
Bbox West Long -76.931
Coupled Resource
Frequency Of Update unknown
Guid
Harvest Object Id dec97347-5b1a-47d9-935e-8b4985690a3e
Harvest Source Id 7f33c4c8-6883-4d0d-8f22-3e72abe9cf60
Harvest Source Title FEMA-R03
Licence 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.
Metadata Language
Metadata Type geospatial
Progress underDevelopment
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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