Framing the Problem of Flood Risk and Flood Management in Metropolitan Los Angeles

This paper develops the concept of flood problem framing to understand decision-makers' priorities in flood risk management in the Los Angeles Metropolitan Region in California (LA Metro). Problem frames shape an individual's preferences for particular management strategies and their future behaviors. While flooding is a complex, multifaceted prob-lem, with multiple causes and multiple impacts, a decision-maker is most likely to manage only those dimensions of flooding about which they are aware or concerned. To evaluate flood decision-makers' primary concerns related to flood exposure, vulnerability, and management in the LA Metro, we draw on focus groups with flood control districts, city planners, nonprofit organizations, and other flood-related decision-makers. We identify numerous concerns, including concerns about specific types of floods (e.g., fluvial vs pluvial) and impacts to diverse infrastructure and communities. Our analyses demonstrate that flood concerns aggregate into three problem frames: one concerned with large fluvial floods exacerbated by climate change and their housing, economic, and infrastructure impacts; one concerned with pluvial nuisance flooding, pollu-tion, and historic underinvestment in communities; and one concerned with coastal and fluvial flooding's ecosystem impacts. While each individual typically articulated concerns that overlapped with only one problem frame, each prob-lem frame was discussed by numerous organization types, suggesting low barriers to cross-organizational coordination in flood planning and response. This paper also advances our understanding of flood risk perception in a region that does not face frequent large floods.