Collapsible soils in Colorado

Abstract

Collapsible Soils in Colorado describes the geologic setting, the geomorphic and soil conditions, locations of potential susceptibility, and engineering properties of collapsible soils in Colorado. This bulletin is the result of a comprehensive and multi-year effort to understand collapsing soil behavior and the geologic and geomorphic conditions where they can form. In addition, this report contains a 1:1,000,000-scale map of Colorado that shows locations of soil collapse compiled from soil test data and damage incidents, climatic exclusions zones, and areas of the state where collapse-prone soil may exist. Collapsible soils are a widespread geologic hazard in the state, common in almost all semi-arid non-mountainous areas. The CGS program addressing this particular geohazard has increased public and professional awareness of collapsible soils. At the same time, through robust evaluation and research, it has improved the existing geological and geotechnical professional standard-of-practice related to the hazard. Note: The Association of American State Geologists announced that their annual John C. Frye Memorial Award for 2009 is granted to the CGS and the staff members who authored EG-14.