Emergency assessment of potential debris-flow peak discharges, Missionary Ridge fire, Colorado
Open-File Report
2002-323
By: Susan H. Cannon, Alan H. Rea, J. Andrew Gleason, and Stephen P. Garcia
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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.
| 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 |
| Google Analytic Metrics | Metrics page |