Published online by Cambridge University Press: 23 October 2025
Chapter 4 explores the challenges posed by urbanisation on water quality, particularly during extreme rainfall events. The chapter traces the historical development of sewer systems designed to channel stormwater out of cities and into water bodies, emphasising the subsequent need for wastewater treatment to protect water sources. The proliferation of impervious surfaces in cities has led to increased flooding, prompting the construction of larger sewers, albeit quantity-focussed solutions. This approach, coupled with the misconception that stormwater is uncontaminated, exacerbates environmental pollution. The chapter advocates for comprehensive urban drainage management during floods to minimise water pollutants. Storm water tanks and SUDs are mentioned as means to reduce pollution loads to reach water bodies. It discusses the factors crucial for effective management, ranging from maintenance and short-term rain forecasting to the importance of pollutographs in long-term planning. Emphasising citizen involvement and a shift towards sustainable drainage techniques, the chapter provides insights for preserving urban environments amidst increasing extreme rainfall events and climate change threats.
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