A Round Weir That Split the Water Fairly
The Shakusenji Cylindrical Diversion Tank (釈泉寺円筒分水槽) is a cylindrical irrigation diversion tank of 1954 in Shakusenji, Kamiichimachi, Nakaniikawa District, Toyama Prefecture, and was registered as a Registered Tangible Cultural Property (structure) on February 17, 2022 (Agency for Cultural Affairs).
The Agency records a reinforced-concrete structure covering 202 square metres; registration number 16-0161.
A Diversion Tank at the Head of the Fan
The Shakusenji Cylindrical Diversion Tank, 9.3 metres across, was built at the head of the Kamiichi River's alluvial fan when the irrigation intakes along the river were combined into one (Agency for Cultural Affairs). Shakusenji in the name is the place, not a temple.
A circular service bridge rings the top of the overflow cylinder (Agency for Cultural Affairs). The water is divided between the main canals on the two banks with a precision of 0.51 to 0.49.
Why It Was Registered
The Agency registered it for its contribution to the historic landscape, a post-war irrigation work whose steady supply ended long years of water shortage.
What to Look For
Look for the overflow cylinder and the circular service bridge around its top (Agency for Cultural Affairs).
Visiting
It is an irrigation facility managed by a land improvement district, and no official information on visiting was found.
Q&A
- When was the Shakusenji diversion tank built?
- In 1954 (Agency for Cultural Affairs).
- Is Shakusenji a temple?
- No, it is the name of the place where the tank stands.
- How precisely does it divide the water?
- Between the two banks at 0.51 to 0.49.
- How big is it?
- 9.3 metres in diameter.
- When was the Shakusenji Cylindrical Diversion Tank registered?
- On February 17, 2022 (Agency for Cultural Affairs).
Basic Information
| Name | Shakusenji Cylindrical Diversion Tank (釈泉寺円筒分水槽) |
|---|---|
| Location | 50-53 Shakusenji, Kamiichimachi, Nakaniikawa District, Toyama Prefecture |
| Designation | Registered Tangible Cultural Property (Structure) |
| Year Designated | Registered 2022/02/17 (Reiwa 4) |
| Quantity | 1 building |
| Dimensions | Reinforced concrete, 202 m², cylinder 9.3 m across |
| Owner | Kamiichi River Riverside Land Improvement District |
| Public Access | No official visiting information |
References
- Shakusenji Cylindrical Diversion Tank (Database of National Cultural Properties, Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/heritage/detail/101/00014154
Last verified: 2026.10.18