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Resilience of On-site Wastewater Treatment Systems After an E xtreme Storm E vent Laura Kohler

This presentation focuses on the vulnerability of On-site Wastewater Treatment Systems (OWTS) to changes in weather and climate variables, aiming to improve risk communication and inform planning decisions. It discusses the fragility, system performance, and resilience of OWTS, highlighting the need for risk mitigation and institutional capacity building. The projected increase in temperature and precipitation by the end of the 21st century and its impact on OWTS performance are examined using case studies, such as the 2013 Boulder Flood.

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Resilience of On-site Wastewater Treatment Systems After an E xtreme Storm E vent Laura Kohler

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  1. Resilience of On-site Wastewater Treatment Systems After an Extreme Storm Event Laura Kohler University of Colorado Boulder

  2. System Performance (%) 100% Robustness Resilience Po To TRECOVER Time

  3. Focus of presentation: What is the vulnerability of OWTS performance to changes in weather and climate variables? OWTS Fragility System Performance (%) 100% Robustness Resilience Po To TRECOVER Time

  4. Objective: Improve risk communication about OWTS solutions compared to other sanitation alternatives to: • Enable risk-informed planning decisions • Advise risk mitigation • Build institutional capacity to respond

  5. Temperature & Precipitation Stream Flow

  6. No. Major Repairs

  7. No. Major Repairs

  8. 1 No. of Precip. Events (> 5 inches) 2 Total Annual Precip. (inches) 3 Max Annual Temp. R2=0.81

  9. Projection for temperature and precipitation increases by end of 21st century leading to weather impacted events such as the 2013 Boulder Flood

  10. Hourly Rainfall (inches) Sep-11 Sep-12 Sep-13 Sep-14 Sep-15 Sep-16 Boulder Creek Stream Flow Level (ft) Major Flooding Moderate Flooding Stream Bank Full Stream Level Sep-11 Sep-12 Sep-13 Sep-14 Sep-15 Sep-16

  11. OWTS Fragility System Performance (%) 100% Robustness Resilience Po To TRECOVER Time

  12. OWTS Fragility System Performance (%) 100% Robustness Rapidity Redundancy Resourceful-ness Resilience Po To TRECOVER Time

  13. Acknowledgements Questions? This material is based upon work supported by the National Science Foundation under Grant No. 2012139999 Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation. Contact: Laura Kohler Laura.kohler@colorado.edu

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