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{{Short description|Small regulating dam on the Nakayamagawa River in Ehime Prefecture, Japan}} |
{{Short description|Small regulating dam on the Nakayamagawa River in Ehime Prefecture, Japan}} |
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Latest revision as of 05:29, 14 January 2026
Small regulating dam on the Nakayamagawa River in Ehime Prefecture, Japan
Nakayamagawa Gyaku Tyouseiti Dam
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Nakayamagawa Gyaku Tyouseiti Dam (中山川逆調整池ダム) is a gravity concrete dam located on the Nakayamagawa River in Saijō, Ehime Prefecture, Japan. The dam was completed in 1963 and plays a role in regulating river discharge associated with regional water management and hydropower operations. [1]
The dam is situated in the Tanbara area of Saijō City in Ehime Prefecture on the island of Shikoku. It impounds a small reservoir on the Nakayamagawa River, which flows down from the Shikoku Mountains toward the Dōzen and Dōgo plains. [2]
Nakayamagawa Gyaku Tyouseiti Dam functions primarily as a regulating reservoir for stabilizing downstream flow, particularly where hydropower generation and irrigation demands are coordinated. Unlike large multipurpose dams, its capacity and design are tailored to managing the release of water rather than major flood control or long-term storage.
Design and Specifications
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The dam’s principal characteristics are as follows:
- Type: Gravity concrete dam
- Height: 20.8 m
- Reservoir capacity: 177,000 m³
- Reservoir surface: 3.18 ha
- Opened: 1963
The reservoir formed by the dam is modest in size and reflects its role as a regulating feature within the river system rather than a large storage facility.
The dam is integrated into the broader water resource network of Ehime Prefecture, where river flow and discharge patterns are influenced by upstream hydropower operations and irrigation needs. After water is released from upstream power facilities, the dam’s reservoir helps moderate fluctuations in flow before water continues downstream.
Although relatively small compared with major multipurpose dams, Nakayamagawa Gyaku Tyouseiti contributes to local water management by reducing rapid variations in river discharge and supporting agricultural water use in the plains that the Nakayamagawa River drains.
- ^ “Nakayamagawa Gyaku Tyouseiti ［Ehime Pref.］ – Dams in Japan”. damnet.or.jp. Retrieved 2026-01-14.
- ^ “Nakayamagawa Gyaku Tyouseiti Dam”, Wikipedia, 2023-10-02, retrieved 2026-01-14
- ^ “List of dams in Japan”, Wikipedia, 2025-01-19, retrieved 2026-01-14
- ^ “Hydroelectricity in Japan”, Wikipedia, 2025-03-30, retrieved 2026-01-14
- ^ “Discharge of radioactive water of the Fukushima Daiichi Nuclear Power Plant”, Wikipedia, 2025-11-29, retrieved 2026-01-14
