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Tokyo's anti-flooding sewers are not as "miraculous" as rumored

Tokyo's underground G-Cans sewer system is hailed as a flood-prevention engineering marvel, but experts warn it is not as "miraculous" as rumoured.

Báo Khoa học và Đời sốngBáo Khoa học và Đời sống10/10/2025

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Hidden 50 meters underground, G-Cans is a giant sewer network that the Japanese liken to a "Sacred Temple" that protects Tokyo from flooding.
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The system, which includes five water intake wells, a tunnel more than 6 km long and a pressure tank the size of a football field, was built at a cost of up to 3 billion USD.
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Since operating in 2006, G-Cans have helped Tokyo avoid hundreds of floods, saving more than $1 billion in economic damage.
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During super typhoon Hagibis in 2019, the system worked at full capacity, saving thousands of homes from being swept away by water.
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However, Japanese experts assert that G-Cans is not an "absolute shield" as many people think.
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Daijiro Sugama, an expert at the Edogawa River Office, warned that the system would only be effective when combined with dikes and other regulating reservoirs.
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Some scientists say the operating and maintenance costs of G-Cans are so high that it would be difficult for any other country to copy this model.
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“G-Cans are a technical marvel, but not a miracle against natural disasters,” experts emphasize, helping to reveal the true limits of the Tokyo “Shrine”.
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Source: https://khoahocdoisong.vn/cong-ngam-chong-ngap-o-tokyo-khong-than-thanh-nhu-loi-don-post2149059646.html


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