Elevation Data for Floodplain Mapping (2007) / Chapter Skim
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1 Introduction
1 Introduction
Pages 10-15
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Approximately $650 billion in insured assets are now covered under the NFIP. The question that this report addresses is: To what degree can or should emerging elevation mapping technologies be used in Flood Map Modernization?
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From page 11... ...
If a community adopts and enforces a floodplain manage ment ordinance to reduce future flood risk to new construction in floodplains, the Federal Government will make flood insurance available within the community as a financial protection against flood losses. This insurance is designed to provide an insurance alternative to disaster assistance to reduce the escalating costs of repairing damage to buildings and their contents caused by floods.
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From page 12... ...
1.2 oRIGIN oF THIS STUDY This study was undertaken at the initiative and with the financial support of the National Academies to make a first assessment of the issues involved in using new elevation technologies for the Flood Map Modernization program. This report is intended to inform Congress during its deliberations in 2007 and was prompted by an enquiry directed to the National Academies from Congress, specifically from the Senate Appropriations Committee, in 2006.
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From page 13... ...
Incorporating information on flood map technologies from this report, the longer-term flood map accuracy study will also deal with such factors as the hydrology of flood flow extremes, the hydraulics of converting flood flows to water surface elevations, the translation of flood elevations defined on isolated cross-section lines into a floodplain map defined over the whole river and floodplain zone, and the cost of flood map creation alternatives versus the benefit in terms of greater accuracy of flood risk assessment. However, the longer-term flood map accuracy study will come to completion at the end of the current five-year Flood Map Modernization process and thus will be more influential on what follows afterward than on the current Flood Map Modernization program.
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From page 14... ...
and metric units because that is the practice in this field of study. For example, topographic maps typically have contour intervals measured in feet, but the aerial mapping companies preparing the elevation data underlying these maps usually specify the accuracy of these data in centimeters or meters.
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From page 15... ...
The committee focused on issues related to map elevation data and not on other sources of uncertainty in flood risk assessment. A previous study examined uncertainty in flood hydrologic and hydraulic computa tions (NRC, 2000)
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