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The story
Following record-breaking heavy rain in Chiba Prefecture, a thread went up on 5channel’s Nandemo Jikkyo G board with photos of the damage from the scene. Chiba City reportedly saw 1,170mm of rainfall over just the past two months, already surpassing its total rainfall for all of 2025. JR’s Uchibo Line has been suspended for three months due to landslides and other damage, sparking concern over the impact on students’ commutes. When posters asked why Chiba alone was hit so hard, some explained it came down to drainage issues involving Lake Inba and the Tone River system — a background that can’t be chalked up to rainfall totals alone.
What people said
That's overkill, man
God: "How many minutes till the B.O. kicks in?" (a meme format joking that the floodwater's about to start reeking)
the blackouts are dragging on forever,
what is even going on out there
Hang in there
Apparently Lake Inba is so massive it's still slowly pulling in water from the surrounding area
Kyushu's local lines are about to be fully back up and running, but JR East just doesn't seem motivated, huh?
Will it even wrap up in 3 months?
There are a ton of spots where the tracks got swallowed by landslides
Kisarazu's packed with high schools that have huge enrollments, can they really hold out 3 months without it?
This reminded me of that
Because it's downstream
Water pours in from the entire northern Kanto region, and since the land is flat, there aren't enough routes to drain it out to sea
Because Ibaraki beefed up its flood defenses after the 2019 floods,
the Tone River ended up running at capacity,
which meant Lake Inba could no longer drain into the Tone,
so the rivers around Sakura overflowed instead.
The fallout just got pushed south
If it rained this much anywhere, you'd get the same result
Even Nagoya, which everyone loves to brag about, just got lucky with a lower rainfall total
That already beats its entire annual rainfall total for 2025
WHAAAAAAAAAT lmaooooooooooo
Background and Key Points of This Discussion
Lake Inba is part of the Tone River watershed, and drainage from the surrounding area ultimately flows into the Tone River. Posters in the thread noted that flood control work on the Ibaraki side, ramped up after Typhoon Hagibis in 2019 (the “Reiwa 1 East Japan Typhoon”), has made the Tone River’s main stream more prone to running high — which in turn has made it harder for Lake Inba to drain. This is difficult to verify, but the theory that upstream countermeasures may be worsening downstream damage in Chiba points to a structural factor that can’t simply be explained away as “there was just more rain this year.” The thread also saw some disagreement over how officials and politicians have responded, but claims that couldn’t be verified are not covered in this article.
※This article is excerpted and summarized from the 5channel (Nandemo Jikkyo G) thread “[Hellscape] Chiba, current situation.”
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