Emergency Relief Program Resilience Case Study – Arizona: Adapting to Changes in Runoff Conditions and Implementing Long-Term Flood Mitigation Measures
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Emergency Relief Program Resilience Case Study – Arizona: Adapting to Changes in Runoff Conditions and Implementing Long-Term Flood Mitigation Measures

Filetype[PDF-460.40 KB]


English
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  • Corporate Creators:
    United States. Department of Transportation. Federal Highway Administration
  • Contributors:
    Heier, Ammon
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-HIF-23-024
  • Resource Type:
    Brief
  • Geographical Coverage:
  • Corporate Publisher:
    United States. Department of Transportation. Federal Highway Administration
  • Abstract:
    In June of 2010, the Schultz Fire burned approximately 15,000 acres (23.4 square miles) of forested land in the Coconino National Forest, located northeast of Flagstaff, Arizona. Shortly thereafter, in July and August 2010, the area experienced the fourth-wettest monsoon season on record. The largest rainfall events occurred on July 20, when 1.78 inches of rain fell in 45 minutes, and on August 16, when 1.06 inches fell in 46 minutes. These short, high-intensity events resulted in extensive flooding that washed out three locations on a five-mile section of U.S. Highway 89 (US 89) and impacted 1,500 homes in residential areas south and east of US 89. The highway, which was closed for several weeks following the flooding, provides access to Phoenix via Interstate 17 and Interstate 40 and Utah and Colorado via Interstate 10. It also serves tourists visiting the Grand Canyon and an increasing volume of freight traffic. Coconino County and the Arizona Department of Transportation (ADOT) decided to incorporate resilience into the repair effort because previous flooding events had repeatedly damaged the highway. The fire also significantly changed the hydrology of the basin and caused vegetation and soil changes that made the roadway more vulnerable to future flooding events.
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