U.S.
GEOLOGICAL SURVEY
Open-File Report 02-258
Fifty-Year Storm-Tide Flood-Inundation Maps for Santa Rosa de Aguán, Honduras
By M.C. Mastin and T.D. Olsen
ABSTRACT
After the devastating floods caused by Hurricane Mitch in 1998, maps of the areas and depths of the 50-year-flood inundation at 15 municipalities in Honduras were prepared as a tool for agencies involved in reconstruction and planning. This report, which is one in a series of 15, presents maps of areas in the coastal municipality of Santa Rosa de Aguán that are prone to oceanic storm-surge flooding and wave action. The 50-year flood on the Río Aguán (4,270 cubic meters per second), would inundate most of the area surveyed for this municipality and beyond. Therefore a detailed numerical hydraulic model was not developed for this municipality as it was for the others. The 50-year storm surge would likely produce higher water levels than the 50-year flood on the river during normal astronomical tides. The elevation of the 50-year storm surge was estimated to be 4.35 meters above normal sea level, based on hurricane probabilities and published storm-surge elevations associated with various hurricane categories. Flood-inundation maps, including areas of wave-action hazard and a color-shaded elevation map, were created from the available data and the estimated 50-year storm tide.
Geographic Information System (GIS) coverages of the hazard areas are available on a computer in the municipality of Santa Rosa de Aguán as part of the Municipal GIS project and on the Internet at the Flood Hazard Mapping Data Web page (http://mitchnts1.cr.usgs.gov/projects/floodhazard.html). These coverages allow users to view the maps in much more detail than is possible using the maps in this report.
Abstract
Introduction
Description of Study Area
Fifty-Year Flood Discharge
Fifty-Year Flood-Inundation Maps
Data Availability
References Cited
This report and associated figures are available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.
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Geographic Information System coverages of flood inundation and flood depth are available at
http://mitchnts1.cr.usgs.gov/projects/floodhazard.html
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Send questions or comments about this report to the author, Mark Mastin (mcmastin@usgs.gov) 253.428.3600 ext. 2609.
For more information about USGS activities in Washington, visit the USGS Washington District home page.
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