Как Работают Огромные Подземные Резервуары Под Городами?

Beneath a suburb of Tokyo stands a concrete hall one hundred seventy-seven meters long, with fifty-nine columns weighing five hundred tons each. It sits empty and dry for hundreds of days a year, and guided tours are held there. Several times a year, it fills with water within a matter of hours, carrying two hundred cubic meters per second. This video is about where cities send rainwater when ordinary pipes can no longer cope. We examine four engineering answers to the same question and show what each solution costs. What’s inside the video. Tokyo’s underground system in Saitama Prefecture. Five shafts sixty-five meters deep, a tunnel fifty meters underground, and the work of dispatchers during Typhoon Hagibis in two thousand nineteen, when the system took in more than twelve million cubic meters of water. The physics of a pressure reservoir. Why an empty concrete hall underground behaves like a basin in a filled bathtub, and why it needs columns weighing hundreds of tons. Chicago. One hundred seventy-six kilometers of tunnels dug since nineteen seventy-two, four-hundred-million-year-old limestone quarries, and the flooding of the downtown area on April thirteenth, nineteen ninety-two, when skipping a ten-thousand-dollar repair led to nearly two billion dollars in damage. Kuala Lumpur. A tunnel where cars drive on an ordinary day, but a river flows during a severe storm. Mexico City. A city built on the bed of a dried-up lake that is sinking by up to fifty centimeters a year, causing parts of the sewer system to lose their slope and forcing runoff to be pumped uphill. And a man who has spent more than forty years clearing blockages in urban drainage systems by hand, in complete darkness. The materials we relied on while preparing this video. Data from Japan’s Ministry of Land, Infrastructure, Transport and Tourism and the Edogawa River Office on the underground system in Saitama. Reports from the Metropolitan Water Reclamation District of Greater Chicago on the tunnel system and quarry reservoirs. Archived reports from the American press and materials from Chicago city services about the flooding in nineteen ninety-two. Materials from Malaysia’s Department of Irrigation and Drainage and the SMART tunnel operator. Publications from Mexico’s National Water Commission and the city water service on the deep tunnel and the sinking of the valley. A two-thousand-twenty-one study led by Estelle Chaussard on the irreversible sinking of Mexico City. Reports from international news agencies on the work of divers in the city’s drainage system. If you work in this field and notice an inaccuracy, let us know in the comments. We read everything and make corrections in future videos. #engineering #infrastructure #popularscience #cities #urbanplanning #tunnels #Tokyo #Chicago #MexicoCity #KualaLumpur #flooding #stormwater #construction #howitworks #documentary #undergroundstructures #technology #scienceandtechnology