Phenomena

How Sewers Work

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One of the most important and underappreciated pieces of urban infrastructure is the sewage system. We rely on them to make our waste vanish, as if by magic. In reality, these systems are carefully engineered and built to be largely self-cleaning and future-proof. Gravity is the primary driver of the system, and engineers design the slope of sewage lines so that flow inside the pipes is fast enough to keep solid waste suspended. There are, of course, plenty of challenges involved; check out the full video for an overview. (Image and video credit: Practical Engineering)

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