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U.S. GEOLOGICAL SURVEY
Open-File Report 02-258

Fifty-Year Storm-Tide Flood-Inundation Maps for Santa Rosa de Aguán, Honduras

Prepared in cooperation with the
U.S. AGENCY FOR INTERNATIONAL DEVELOPMENT

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.

CONTENTS

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.

Download the report (PDF, 722 KB)

Select 11x17 high resolution versions of Figure 1 (PDF, 4.6 MB), Figure 3 (PDF, 2.0 MB),
Figure 4 (PDF, 706 KB), and Figure 7 (PDF, 1.8 MB) to view or print.

Geographic Information System coverages of flood inundation and flood depth are available at
http://mitchnts1.cr.usgs.gov/projects/floodhazard.html

Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 5.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.

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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