Beneath Kasukabe, Japan, G-Cans creates an additional route for floodwater. Explore the 6.3 km tunnel, five shafts, pressure-adjusting tank and four pumps that discharge toward the Edogawa River.
The pumps’ combined rated maximum capacity is 200 m³/s (200,000 liters per second). This is a design capacity, not a measurement of the flow visible in the footage. The system reduces flood risk as part of wider river-basin measures.
00:00 Inside the chamber
00:24 Why go underground?
00:52 Follow the water
01:28 Why the tank’s weight matters
02:03 Moving the flood
02:36 The world above
Real G-Cans footage and photographs are combined with clearly labelled illustrative drainage clips and simplified explanatory diagrams. Archival material and separate CCTV camera views are not presented as one continuous real-time event.
VISUAL SOURCES & CREDITS
Edited excerpts, crops, explanatory labels, English narration and music added by World Under Load. Original source audio has been removed. No source or public agency endorses this production.
MLIT / Kanto Regional Development Bureau / Edogawa River Office: G-Cans CCTV and facility photographs. Public Data License 1.0 for ministry-owned material, subject to stated exceptions.
Terms: and
ランニング雑談チャンネル「チャレンジョイ!!」 — まさに異空間！これがウワサの地下神殿だ！【首都圏外郭放水路】
MIYAGAYAOOTAHARA — DSCF6385首都圏外郭放水路20161112特別一般公開 ポンプ室
MIYAGAYAOOTAHARA — DSCN7825首都圏外郭放水路20171118特別一般公開 地下宮殿
The Central News Agency(CNA Taiwan) — 東京疏浚 地下神殿治洪
These original YouTube uploads declare Creative Commons Attribution reuse. License:
kakushinya — Metropolitan Area Outer Underground Discharge Channel – catwalk, 2008 (cropped and gently reframed), CC BY 2.0.
CityXcape — Water Draining from a Downspout, Pexels.
K / @kelly — Water Flowing Into a Storm Drain, Pexels.
These two clips illustrate general runoff and drainage; they do not depict G-Cans or establish a location in Japan.
Music: Radio Flyer — Nathan Moore, YouTube Audio Library. Attribution not required by the downloaded catalog license; credit included voluntarily.
Voice: Expressive Evan / HeyGen. Script, explanatory diagrams and editorial production: World Under Load.
FACT-CHECK SOURCES
MLIT / Edogawa River Office:
Overview:
Flooding and terrain:
Tunnel:
Shafts and overflow weirs:
Pressure-adjusting tank:
Pumps:
#GCans #Kasukabe #Japan #Engineering
source