Andrew Lam

How Giant Walls Stop Tokyo from Flooding

Want to restore the planet’s ecosystems and see your impact in monthly videos? The first 100 people to join Planet Wild with my code ANDREW4 will get the first month for free on me: https://planetwild.com/r/andrewlam/join If you want to get to know them better first, check out their mission building wildlife crossings: https://planetwild.com/r/andrewlam/m34 --- 38% of Tokyo's urban core sits below flood level. The only thing protecting 8.2 million people and $1.1 trillion in assets is a flood defense system that nearly failed in 2019. This is how it works, why it's barely holding, and what happens if it breaks. --- TO LEARN MORE ABOUT TOKYO'S FLOOD PROBLEM - See my last video on how city's stop flooding: https://youtu.be/coXe8_xnAOs - Tokyo Flood Hazard Map & Evacuation Guide https://www.city.edogawa.tokyo.jp/documents/56624/gaiyou-en.pdf - What happens when Tokyo's subway floods: https://doi.org/10.1016/j.proeng.2016.11.730 - Tokyo's entire flood zone simulated in 3D: https://experience.arcgis.com/experience/b5472c1973664866b6ca7758e7c7d434/page/Page1?views=3D-City-Models-of-Tokyo-%28Textured%29-%2CStep2%3A-View-your-house-in-3D%2CThe-Design-Flood Table of Contents 0:00 The Signs Nobody Notices 1:02 One River, A Century of Floods 2:11 They Built a River From Scratch 4:26 Seeing The Walls That Protect Tokyo 7:42 Why This Part of Tokyo Floods to Save It 13:05 Protecting Tokyo's Subways 15:51 The Aftermath - Draining the City of Water