By National Research Council, Division on Earth and Life Studies, Board on Earth Sciences and Resources, Committee on Floodplain Mapping Technologies
Floodplain maps function the root for picking no matter if houses or structures require flood coverage lower than the nationwide Flood assurance software run by way of the Federal Emergency administration employer (FEMA). nearly $650 billion in insured resources at the moment are coated less than this system. FEMA is modernizing floodplain maps to raised serve this system. notwithstanding, matters were raised as to the adequacy of the "base map" info on hand to aid floodplain map modernization."Elevation information for Floodplain Mapping" indicates that there's enough two-dimensional "base map imagery" to fulfill FEMA's flood map modernization objectives, yet that the three-d "base elevation information" which are had to be sure even if a construction must have flood coverage will not be sufficient. This publication makes concepts for a brand new nationwide electronic elevation facts assortment application to redress the inadequacy. coverage makers, estate assurance pros; federal, neighborhood, and kingdom governments; and, others eager about common catastrophe prevention and preparedness will locate this publication of curiosity.
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Extra resources for Elevation Data for Floodplain Mapping
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The figure below shows potential areas of subsidence within the United States. Subsidence creates problems for flood mapping; its effects can vary from riverine to coastal environments, and the location and type of subsidence will determine the impact on the mapping of the floodplain boundary. Potential areas of subsidence in the continental United States. , 2000. Within riverine environments, the relative water depth difference between the computed water surface elevation and the ground elevation is the most important parameter, rather than the absolute elevation (see figure below).
Because of this uncertainty, FEMA generally considers the BFE to remain fixed relative to the datum so that it does not subside as the land does. 34 FEMA’s Map Modernization Program Subsidence effects on riverine flooding. SOURCE: Based on the Riverine Subsidence Diagram provided in FEMA, 2000. Within coastal environments the absolute elevation is critical for floodplain management, as shown in the figure below. As the land sinks, the base elevation of the land surface changes relative to sea level, and the absolute stillwater coastal elevation will inundate more land as more subsidence occurs.
NFIP claims 6. Repetitive loss claims 7. Repetitive loss properties 8. Federally declared flood disasters 9. Predicted population growth to 2010 10. Length of stream or coasts on nonfederal lands (some minor amount of mapping does occur on federal lands) The mapping involved a significant effort to retrieve and correlate spatial data from a variety of databases and to check the coverage and quality of those data. The data were then analyzed to establish quantitative estimates of each parameter for each Census block group.