On the night of August 13, 2026, Chiba Prefecture — just east of Tokyo — recorded 115.0 mm of rain in a single hour, the highest since observations began in 1966. Japan’s urban sewers, however, are designed to a national standard of a “once in five to ten years” rain; in Funabashi City that means about 50 mm per hour. Japan’s government has already rewritten its flood planning assumptions for climate change. What hasn’t caught up is the infrastructure on the ground and the hazard maps that tell residents what their own street was built to withstand. We look at the design assumptions behind a modern city, what Reddit users in Chiba reported live that night, and the one decision individuals can update before the next storm.
Full article: https://sekahan0623.com/en/global-reactions-en/chiba-record-rainfall-100-year-assumption/
X (Twitter): https://x.com/sekahan_0623
This program is produced with synthesized narration (Voice: Google Cloud Text-to-Speech (Chirp 3: HD)).
