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Tokyo's problem is caused by water flow impediment, because Tokyo is a concrete jungle. So water can't soak through the ground. They wouldn't need those massiv

• alephnan 5y ago
  Many of the trusted infrastructure and construction projects in Vietnam are actually lead by foreign teams with Japan being a notable example ( bridges, etc.) When it comes to drainage, Vietnam didn’t take the learnings of Japan who had to learn first hand this “tech debt” of a concrete jungle. In fact, the solution in Vietnam is often layering on more layers of concrete, so water floods anywhere but the streets instead ( people’s home, who foundation is now 10 feet below ground). This is the lowest cost solution while offering the politicians a kickback, until people build their barricades high and flood the streets again.