OF-14-02 Foothill and Mountainous Regions in Boulder County, Colorado That May Be Susceptible to Earth and Debris/Mud Flows During Extreme Precipitation Events

The large‐scale precipitation events of September 11 to 14, 2013 resulted in catastrophic flooding on the floors of existing stream and gulch valleys in Boulder County. In addition to the flooding within the 100‐ to 500‐year floodplains, there were also many upland flows that occurred well above and outside mapped floodplains. These types of flows are classified as earth flows and debris/mud flows, which are considered geologic hazards. This report and the accompanying map coverage address only these types of hazards. Hydrologic flooding within main stream channels and their floodplains were not included in this study. Included: Map plate, GIS files, booklet. Digital ZIP download. OF-14-02D

Author: Matthew L. Morgan, Jonathan L. White, F. Scot Fitzgerald, Karen A. Berry, and Stephen S. Hart
Year: 2015