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For much of the twentieth century, affordable housing in the United States was conceived as a distinct residential category, shaped by financing structures and development practices that separated housing for lower-income residents from the broader civic and commercial functions of the city. Federal housing legislation and subsequent urban renewal policies contributed to the construction of large residential developments that were frequently financed and managed independently of surrounding urban infrastructure. The consequences of this approach, including concentrated poverty, deteriorating buildings, unequal access to services, and the eventual demolition of prominent public housing projects, are extensively documented.

Today, the provision of affordable housing is closely tied to economic and regulatory mechanisms that determine feasibility, from land values and construction costs to zoning regulations and public subsidies. Programs for housing credits play a significant role in financing affordable rental housing, while competitive allocation of resources and pressure to maximize housing delivery place considerable emphasis on regulatory compliance.

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At Bishan–Ang Mo Kio Park in Singapore, a river does not occupy a fixed boundary. Under ordinary conditions, water moves through a naturalized channel bordered by grass, planting, and paths that bring visitors close to the river. During heavy rainfall, water spreads into the surrounding park, which is designed to accommodate flows beyond the capacity of the narrower channel. What appears to be a public landscape is also working infrastructure. Singapore's approach retains drainage engineering while assigning a wider role to the land around it.

For decades, Singapore's network of concrete canals has been central to managing stormwater in a densely developed city exposed to intense tropical rainfall. Their hard surfaces and defined channels were designed to convey water efficiently. These channels moved stormwater efficiently, but offered limited space for public access, planting, or other uses along the water's edge. Through its Active, Beautiful, Clean Waters (ABC Waters) Programme, launched in 2006, Singapore began integrating waterways with parks, ecological systems, and public spaces. The programme links stormwater management with the design of parks, waterways, and public spaces.

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