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Where Does the Rain Actually Go?
Rain on a city street is a plumbing problem arriving all at once. This episode digs into the hidden engineering of municipal drainage: the difference between storm sewers and sanitary sewers, why combined systems were a deliberate Victorian design choice rather than a mistake, and how engineers decide how much rain a pipe has to swallow. Then it climbs into the megaprojects — Tokyo's G-Cans cathedral of concrete silos and pillars, London's Tideway Tunnel — and asks the harder question underneath all of it: what happens when the storm is bigger than the design, and whether the discipline is…
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