Infiltrating the Kusaka River New Underground Discharge Channel.
See and experience the history of floods and flood control technology.
通常立ち入り禁止の巨大放水路へ潜入！
The new discharge channel, through which start to flow the water in June 2023.
Your guide will lead you through the drainage tunnel, which is normally off-limits to the public, and you will get a feel for the imposing size of the enormous structure up close while watching images projected directly into the tunnel, experiencing the history of the fight against flooding and flood control.
放水路探検ツアーの流れ – ここでしかできない体験とは？
📍 1. 受付・説明
ツアーのスタート地点で受付を済ませ、
放水路の役割やツアーのポイントをガイドが解説。
📍 2. 壁面映像で「水害の歴史」を学ぶ
トンネル内の壁面に映し出されるのは、過去の水害と治水の進化の記録。
リアルな映像で学びを深めます。
📍 3. トンネル内部へ潜入いよいよ放水路へ。
通常は立ち入り禁止の巨大トンネルを歩きながら、そのスケール感を体感。
📍 4. 放水路の終点へ到着！
トンネル探検の最終地点に到着。
ここで放水路を流れた水が仁淀川へとつながります。
巨大な水門の迫力を間近で体感し、最後の解説を聞きながらツアー終了！
ツアーの魅力
いつもの観光じゃ物足りないあなたへ
✅ 通常立ち入り禁止の巨大放水路を特別見学！
✅ 何気なく流れる川。その裏で働く“見えない守り手”を体感。
✅ 暗闇・巨大空間・響く水の音——五感で体験する非日常
✅ ただの観光じゃない、防災をリアルに学ぶ体験型ツアー
✅ ここでしかできない、ワクワクする地下探検！
あなたの冒険を、さらに特別に
🦎 トンネル内で生き物観察
放水路の水辺に生息する生き物を探す。
ひざ下まで水に入り、自然の中の生態系を発見！
🚣♂️ 特別カヌー探検（限定枠）
放水路をカヌーで進む、完全予約制の特別体験。
限られた人だけが味わえる究極の探検！
ギャラリー
Shin-Kusaka River Floodway Experience Plan List
No.2
Tunnel exploration of Kusaka River New Underground Discharge Channel
◆Tour of the discharge channel
Wear a helmet and boots and walk around the tunnel entrance
◆Tunnel exploration
Due to the structure of the Shin-Kusakagawa spillway, water accumulates in the latter half of the tunnel.
We put on waders (boots that reach up to the waist) and dive into the water up to knee-deep!
We also explore creatures that survive in the dark!
No.3
Cauoe experience in the Kusaka River New Underground Discharge Channel
We are currently preparing! (If you are interested, please contact us.)
◆Tour of the discharge channel
Equip yourself with a helmet and boots and walk around the tunnel entrance
◆Underground cruise
Activity to go to the construction penetration point in the center of the tunnel by kayak or water bike
No.4
Pass trough the Kusaka River New Underground Discharge Channel by canoeing
We are currently preparing! (If you are interested, please contact us)
◆Tour of the discharge channel
Equip yourself with a helmet and boots and walk around the tunnel entrance
◆Underground cruise through the tunnel
The tunnel is just over 5km long, and there is a maintenance road on the exit side in the neighboring town of Ino, so it is possible to return to the surface alive. This is a hard activity where you cruise about 2km to the tunnel exit maintenance road on your own.
