Climate stress testing for water systems: Review and guide for applications

Together with other "bottom-up" methods, climate stress testing is becoming a prominent approach for climate change impact assessment of water systems. Compared with traditional approaches, stress testing is: (i) more focused on exploring the vulnerabilities of the system at hand; (ii) potentially more inclusive, being amenable to stakeholder involvement and (iii) well suited to identify robust policy options that better account for the deep uncertainty associated with multiple plausible futures. Stress testing is rapidly evolving and giving rise to new techniques and concepts, but few articles provide an accessible overview that can serve as an introduction to the field. Here, we review the underlying principles and concepts of climate stress testing, providing a guide to the main decisions involved in practical application. Topics include selection of stressors, characterizing and exploring the exposure space and data generation including the use of stochastic data. In a complex world where water decisions are made in the context of wider socio-ecological systems, stress testing and other bottom-up methods can support decisions that are not only robust to future uncertainty but also regarded as legitimate by affected communities. This article is categorized under: Engineering Water > Sustainable Engineering of Water Science of Water > Water and Environmental Change Water and Life > Stresses and Pressures on Ecosystems