Evaluating post-wildfire debris-flow rainfall thresholds  and volume models at the 2020 Grizzly Creek  Fire in Glenwood Canyon, Colorado, USA

Rengers, Francis K.; Bower, Samuel; Knapp, Andrew; Kean, Jason W.; vonLembke, Danielle W.; Thomas, Matthew A.; Kostelnik, Jaime; Barnhart, Katherine R.; Bethel, Matthew; Gartner, Joseph E.; Hille, Madeline; Staley, Dennis M.; Anderson, Justin K.; Roberts, Elizabeth K.; DeLong, Stephen B.; Lane, Belize; Ridgway, Paxton; Murphy, Brendan P.

doi:https://doi.org/10.5194/nhess-24-2093-2024

Articles | Volume 24, issue 6

https://doi.org/10.5194/nhess-24-2093-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-24-2093-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 6

Research article

|

28 Jun 2024

Research article |

| 28 Jun 2024

Evaluating post-wildfire debris-flow rainfall thresholds and volume models at the 2020 Grizzly Creek Fire in Glenwood Canyon, Colorado, USA

Francis K. Rengers, Samuel Bower, Andrew Knapp, Jason W. Kean, Danielle W. vonLembke, Matthew A. Thomas, Jaime Kostelnik, Katherine R. Barnhart, Matthew Bethel, Joseph E. Gartner, Madeline Hille, Dennis M. Staley, Justin K. Anderson, Elizabeth K. Roberts, Stephen B. DeLong, Belize Lane, Paxton Ridgway, and Brendan P. Murphy

Supplement

https://doi.org/10.5194/nhess-24-2093-2024-supplement

Data sets

Airborne Lidar Data (2016 and 2021) Capturing Debris Flow Erosion and Deposition after the Grizzly Creek Fire in Glenwood Canyon Colorado F. K. Rengers et al. https://doi.org/10.5066/P99OT77K

Precipitation, and Volume Measurements in the Grizzly Creek Burn Perimeter June 2021-September 2022, Glenwood Canyon, Colorado F. K. Rengers et al. https://doi.org/10.5066/P9Z7RROL

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Short summary

Every year the U.S. Geological Survey produces 50–100 postfire debris-flow hazard assessments using models for debris-flow likelihood and volume. To refine these models they must be tested with datasets that clearly document rainfall, debris-flow response, and debris-flow volume. These datasets are difficult to obtain, but this study developed and analyzed a postfire dataset with more than 100 postfire storm responses over a 2-year period. We also proposed ways to improve these models.