These tunnels stop part of Tokyo flooding

If you believe the hype, then the Metropolitan Area Underground Discharge Channel stops Tokyo flooding. It doesn't. But it is one colossal part of a huge network of flood defences that protect a city that would otherwise be... well, very wet.
MORE ABOUT THE DISCHARGE CHANNEL:
The Discharge Channel's site (in Japanese): www.ktr.mlit.go...
Advice for English-speaking visitors:
matcha-jp.com/...
REFERENCES:
"Below sea level" and "aging levees": www.kensetsu.me... [PDF, parts translated in www.nytimes.co... ]
"All that protects the two and a half million people": mainichi.jp/en...
Discharge channel stats: www.japanriver.... [PDF]
THANKS TO:
Local fixer: Yamada Masato
Post translator: Dominic Jacobs
Edited by Michelle Martin (@mrsmmartin)
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