Cover: Presenting Uncertainty About Climate Change to Water-Resource Managers
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Presenting Uncertainty About Climate Change to Water-Resource Managers

A Summary of Workshops with the Inland Empire Utilities Agency

by David G. Groves, Debra Knopman, Robert J. Lempert, Sandra H. Berry, Lynne Wainfan

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Appendix A

Workshop Presentations

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Appendix B

Summary Statistics from Surveys

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Water-resource managers have long strived to meet their goals of system reliability and environmental protection in the face of many uncertainties, including demographic and economic forecasts, intrinsic weather variability, and short-term climate change induced by El Niño and other naturally occurring cycles. Now water managers also face a new uncertainty — the potential for longer-term and more persistent climate change, which, in coming years, may significantly affect the availability of supply and patterns of water demand. Information about the future effects of climate change is deeply uncertain and likely to remain so for the foreseeable future. Thus, the scientific community is debating how to most usefully characterize this important yet uncertain information for decisionmakers. As part of a multiyear study on climate-change decisionmaking under uncertainty, RAND researchers are working with water agencies in California to help them better understand how climate change might affect their systems and what actions, if any, they need to take to address this challenge. This report documents the methods and observations used to preserve an archive of the workshop process and provide a basis for refining the approach for future applications.

Table of Contents

  • Chapter One

    Introduction

  • Chapter Two

    Alternative Treatments of Uncertainty

  • Chapter Three

    Modeling Climate-Change Effects on IEUA

  • Chapter Four

    Performance of IEUA Plans Under Future Conditions

  • Chapter Five

    Evaluating Uncertainty Frameworks in Workshops

  • Chapter Six

    Final Observations and Discussion

  • Appendix A

    Workshop Presentations

  • Appendix B

    Summary Statistics from Surveys

The research described in this report was sponsored by the National Science Foundation and was conducted under the auspices of the Environment, Energy, and Economic Development Program (EEED) within RAND Infrastructure, Safety, and Environment (ISE).

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