![]() ![]() Each State or Territory data set consists of all DFIRMs and corresponding LOMRs available on the publication date of the data set. The NFHL is available as State or US Territory data sets. The NFHL data contain layers in the Standard DFIRM datasets except for S_Label_Pt and S_Label_Ld. The specifications for the horizontal control of DFIRM data are consistent with those required for mapping at a scale of 1:12,000. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The NFHL data are 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 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 the digital, geospatial version of the flood hazard information shown on the published paper Flood Insurance Rate Maps(FIRMs). This layer is part of the National Flood Hazard Layer dataset: The National Flood Hazard Layer (NFHL) data incorporates all Digital Flood Insurance Rate Map(DFIRM) databases published by FEMA, and any Letters Of Map Revision (LOMRs) that have been issued against those databases since their publication date. There is one polygon for each contiguous flood zone designated. The spatial elements representing the flood zones are polygons. These data are the flood hazard areas that are or will be depicted on the Flood Insurance Rate Map (FIRM). In Michigan, and nationally, the term floodplain has come to mean the land area that will be inundated by the overflow of water. The Floodplain Mapping flood risk boundaries are derived from the engineering information 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 land that is inundated by water is defined as a floodplain. A river, stream, lake, or drain may on occasion overflow their banks and inundate adjacent land areas. These zones are used by the federal Emergency Management Agency (FEMA) to designate the Special Flood Hazard Area (SFHA) and for insurance rating purposes. Floodplain Management/National Flood Insurance. The flood insurance risk zone layer contains information about the flood hazards for Michigan. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |