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We convened a workshop to enable scientists who study water systems from both social science and physical science perspectives to develop a shared language. This shared language is necessary to bridge a divide between these disciplines' different conceptual frameworks. As a result of this workshop, we argue that we should view socio-hydrological systems as structurally coconstituted of social, engineered, and natural elements and study the "characteristic management challenges" that emerge from this structure and reoccur across time, space, and socioeconomic contexts. This approach is in contrast to theories that view these systems as separately conceptualized natural and social domains connected by bi-directional feedbacks, as is prevalent in much of the water systems research arising from the physical sciences. A focus on emergent characteristic management challenges encourages us to go beyond searching for evidence of feedbacks and instead ask questions such as: What types of innovations have successfully been used to address these challenges? What structural components of the system affect its resilience to hydrological events and through what mechanisms? Are there differences between successful and unsuccessful strategies to solve one of the characteristic management challenges? If so, how are these differences affected by institutional structure and ecological and economic contexts? To answer these questions, social processes must now take center stage in the study and practice of water management. We also argue that water systems are an important class of coupled systems with relevance for sustainability science because they are particularly amenable to the kinds of systematic comparisons that allow knowledge to accumulate. Indeed, the characteristic management challenges we identify are few in number and recur over most of human history and in most geographical locations. This recurrence should allow us to accumulate knowledge to answer the above questions by studying the long historical record of institutional innovations to manage water systems.

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Systemic inequalities, which affect how water is distributed and used, underlie water insecurities in higher-income (global North) countries. We explore the interlinkages between municipal decision-making and infrastructure to understand how urban climate justice can be advanced through engaging with state-like forms of governance. Drawing on archival information, spatial analysis, participant observation, and semi-structured interviews in the underbounded Latinx community of East Porterville, California, we analyze how local actors actively work against municipal-scale processes of infrastructure exclusion and production, within and beyond the state, to facilitate water access and particular notions of citizenship. We argue urban climate justice demands both an understanding of infrastructural marginalization, and attention to the diversity of perspectives, approaches, and solutions preferred by communities.

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