The Linear-Shizuoka Agreement Now Carries a Clause to Halt the Work — How a Century-Old Memory of Water Loss Became Procedure
On July 18, 2026, Shizuoka Prefecture and JR Central signed a nature-conservation agreement for the Linear Chuo Shinkansen, and the only unbuilt section, in Shizuoka, moves toward construction. What matters is the content: a clause to halt the work if something unforeseen arises. This is not the finale of a conflict drama but the result of a century-old memory — the Tanna Tunnel's water loss — transcribed, through a national expert panel, into numbers and procedure like the 30-day rule and the monitoring of 33 streams.
TL;DR
- The July 18, 2026 agreement between Shizuoka and JR Central spells out a clause to halt the work if something unforeseen arises
- This is not the finale of a "state versus locality" drama but the result of a century-old memory — the Tanna Tunnel's water loss — transcribed into numbers and procedure
- A locality's power to halt a national project comes not from abstract political muscle but from the craft of turning a memory of harm into numbers and procedure
On July 18, 2026, Shizuoka Prefecture and JR Central signed a nature-conservation agreement for the Linear Chuo Shinkansen. The agreement spells out a halt clause: if something unforeseen arises, the work is to be stopped for a time. This reads less as the finale of a "state versus local pride" drama than as the result of a century-old memory of harm within the same prefecture—the Tanna Tunnel's water loss—being transcribed, through the national expert panel, into concrete numbers and procedure such as the Tashiro Dam 30-day rule and the monitoring of 33 streams.
What Is Happening
The 2026 Shizuoka–JR Central agreement adds a written clause to halt the work — a locality's brake on a national project
On July 18, 2026, Shizuoka Prefecture and JR Central signed a nature-conservation agreement for the Linear Chuo Shinkansen. The Shizuoka section — the only unbuilt stretch between Shinagawa and Nagoya — moves toward construction. Yet when the main tunnel drilling will begin is still undecided.
What to look at is the content of the agreement. Governor Suzuki Yasutomo approved construction on July 7 and said that, written into the agreement, under a monitoring framework, if something unforeseen arises the work is to be stopped for a time to check the cause and consider a response. A nationwide developer has, in writing, acknowledged in an agreement with a local government the possibility of halting the work. It is a concrete institutional answer to the question, "can a locality halt a national project?"
Background & Context
Oi River groundwater could escape to Yamanashi; behind the caution is the century-old Tanna Tunnel water loss; talks split into 47 items
Why was a clause to halt the work needed? The water of the Oi River. Its source is Mt. Ainodake at 3,190m, and its basin covers 1,280 km²; across eight cities and two towns it serves water supply, farming, industry, and power. Its farm water irrigates about 12,000 hectares, including the Makinohara plateau that yields about half the prefecture's tea; in industry, some 400 firms draw groundwater from about 900 wells. Dig the tunnel, and groundwater upstream seeps in and escapes toward Yamanashi. It is not simply that intake falls; water flows out of the prefecture, and the Oi River's flow and water table drop.
But the real reference point of this water problem lies a century ago. In the same Shizuoka, the Tanna Tunnel of the Tokaido Main Line (1918 to 1934) produced huge inflows, and water equal to three Lake Ashi, about 600 million cubic meters, was lost, and the water table fell about 130m near the tunnel. Wasabi, paddies, and drinking water dried up; 5,000 chobu of paddy were damaged and 6,000 farmers affected. Compensation came years after the harm, and the lost water never returned. This memory of water loss a century ago, within the same prefecture, underlies the prefecture's caution.
How did the state handle the conflict? In 2020, the transport ministry, alarmed by the pace of the dialogue between the prefecture and JR Central, set up an expert panel — not an arbitration that judges the dispute. It took up the 47 items of discussion that Shizuoka had built up, under five principles the prefecture required — transparency and neutral members and chair, and, in a form where the state instructs JR Central, closed them one by one. Through two-stage reports on water resources and on environmental conservation, the monitoring role passed to a Monitoring Council and continues today.
Reading the Structure
Institutional design, not a drama; a memory of harm becomes the 30-day rule and 33-stream monitoring, letting a locality match the project
Linear-Shizuoka has been told as a drama of "the state versus local pride." But read the primary sources and the reality is institutional design. By having the state examine, in a neutral panel, the items the prefecture had built up, the conflict between asymmetric parties was converted, rather than left as raw emotion, into a set of closeable items. And the memory of the Tanna Tunnel was transcribed into concrete numbers and procedure: the 30-day rule — if, even with restricted intake at the Tashiro Dam, the same volume as the out-of-prefecture outflow cannot be secured for 30 days, a halt to drilling is considered — and the monitoring of 33 streams. The Southern Alps is a rare ecosystem designated a UNESCO Eco Park, where the DNA of the endangered Akaishi salamander has been detected.
So a locality's power to halt a national project is not abstract political muscle. It is won by the craft of turning a century's memory of harm into numbers and procedure. The former governor's words, "not a single drop," paid the cost of the conflict, and his successor, Governor Suzuki, settled its fruit as an institution. Conflict and cooperation worked, dividing the roles between them.
This institutional craft is not the Linear's alone. Turning a conflict into closeable items and procedure is akin to designing a participatory policy-making process. Conflicts between asymmetric parties — restarting nuclear plants, military bases, siting renewable energy — can be turned, rather than left as raw political emotion, into closeable items, numbers, and procedure. The halt clause is one example. A locality can stand on equal terms with a nationwide project when it has turned the memory of harm into a procedure the next generation can use.
Further Reading
- リニアは南アルプスをくぐり抜けることができるのか リニア中央新幹線ダークツーリズムガイド (Can the Linear Pass Through the Southern Alps? A Dark-Tourism Guide to the Linear Chuo Shinkansen) (Mitsuru Munakata, Yama-Kei Publishers, November 2025) — an author who moved to Ohshika Village in Nagano, at the mouth of the Southern Alps tunnel, walks the site as a mountaineer and villager and records the light and shadow of the Linear in photographs. (In Japanese.)
References
Response to Environmental Impacts of Linear Chuo Shinkansen Construction — Shizuoka Prefecture. Shizuoka Prefecture, Department of Living Environment
A Case of Water Depletion in Another Tunnel Project (the Tanna Tunnel) — Shizuoka Prefecture. Shizuoka Prefecture, Department of Living Environment
On the Expert Panel Concerning the Shizuoka Section of the Linear Chuo Shinkansen — Ministry of Land, Infrastructure, Transport and Tourism. MLIT, Railway Bureau
Chuo Shinkansen: Environmental Conservation — Central Japan Railway Company (JR Central). Central Japan Railway Company
