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Emergency assessment of potential debris-flow peak discharges, Missionary Ridge fire, Colorado

Open-File Report 2002-323
By: , , , and 
https://doi.org/10.3133/ofr02323

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Abstract

These maps present the results of assessments of peak discharges that can potentially be generated by debris flows issuing from the basins burned by the Missionary Ridge fire of June 9 through July 14, 2002, near Durango, Colorado. The maps are based on a regression model for debris-flow peak discharge normalized by average storm intensity as a function of basin gradient and burned extent, and limited field checking. A range of potential peak discharges that could be produced from each of the burned basins between 1 ft3/s (0.03 m3/s) and 6,446 ft3/s (183 m3/s) is calculated for the 5-year, 1-hour storm of 0.80 inches (20 mm). Potential peak discharges between 1 ft3/s (0.03 m3/s) and >8,000 ft3/s (227 m3/s) are calculated for the 25-year, 1-hour storm of 1.3 inches (33 mm) and for the 100-year, 1-hour storm of 1.8 inches (46 mm). These maps are intended for use by emergency personnel to aid in the preliminary design of mitigation measures, and for the planning of evacuation timing and routes.

Suggested Citation

Cannon, S.H., Rea, A.H., Gleason, J.A., Garcia, S.P., 2002, Emergency assessment of potential debris-flow peak discharges, Missionary Ridge fire, Colorado: U.S. Geological Survey Open-File Report 2002-323, 1 over-size sheet., https://doi.org/10.3133/ofr02323.

ISSN: 2331-1258 (online)

Publication type Report
Publication Subtype USGS Numbered Series
Title Emergency assessment of potential debris-flow peak discharges, Missionary Ridge fire, Colorado
Series title Open-File Report
Series number 2002-323
DOI 10.3133/ofr02323
Year Published 2002
Language English
Publisher U.S. Geological Survey
Description 1 over-size sheet.
Country United States
State Colorado
Additional publication details