A history of urban floods underlines the state's efforts to discipline people as well as to control floodwaters. We focus on two big cities in Southeast Asia—Singapore and Metro Manila—in the period from after World War II until the 1980s. During this period, both cities traversed similar paths of demographic and socioeconomic change that had an adverse impact on the incidence of flooding. Official responses to floods in Singapore and Manila, too, shared the common pursuit of two objectives. The first was to tame nature by reducing the risk of flooding through drainage and other technical measures, as implemented by a modern bureaucracy. The second was to discipline human nature by eradicating “bad” attitudes and habits deemed to contribute to flooding, while nurturing behavior considered civic-minded and socially responsible. While Singapore's technocratic responses were more effective overall than those in Metro Manila, the return of floodwaters to Orchard Road in recent years has highlighted the shortcomings of high modernist responses to environmental hazards. This article argues that in controlling floods—that is, when nature is deemed hazardous—the state needs to accommodate sources of authority and expertise other than its own.