Overview
The Toga Dam is a gravity dam located on the Togagawa River in Toyama Prefecture, Japan. Situated near Omaki village, the structure lies approximately 11 km (6.8 mi) southeast of Shogawa. It functions as a key component of the regional hydroelectric infrastructure, specifically designed to divert water to power generation facilities in the area. The dam was constructed between 1941 and 1943, establishing its operational presence during the early 20th century development of Japan's energy grid. It was officially commissioned in 1944, marking the beginning of its service in harnessing the hydraulic potential of the Togagawa River.
The primary role of the Toga Dam is to support the Omaki hydroelectric power station. The dam diverts water from the Togagawa River to this facility, which is located 4.3 km (2.7 mi) to the west on the Shō River. The Omaki station has an installed capacity of 17.6 MW, contributing to the local energy supply through hydroelectric generation. This configuration illustrates a classic run-of-river or diversionary hydro scheme, where the dam's gravity structure manages water flow to drive turbines at a downstream power house. The operational status of the Toga Dam remains active, continuing its function in the energy infrastructure of Toyama Prefecture. The integration of the Togagawa and Shō River systems allows for efficient water management and power production in the region. The dam's design and location reflect the engineering priorities of its era, focusing on reliable water diversion to support consistent electricity generation. As a gravity dam, the Toga Dam relies on its mass to resist the water pressure, a robust and time-tested design choice for the terrain and hydrological conditions of the area. The facility continues to operate, maintaining its commissioning year of 1944 as a historical benchmark for its service life. The proximity to Omaki village and Shogawa highlights the dam's role in local development, providing energy resources to the surrounding communities. The 17.6 MW capacity of the associated Omaki station underscores the significant energy output generated by this specific hydroelectric setup. The distance of 4.3 km between the dam and the power station is a critical parameter in the hydraulic efficiency of the system. The Togagawa River serves as the primary water source, with the Shō River acting as the conduit for the diverted flow to the turbines. This infrastructure represents a lasting example of mid-20th century hydroelectric engineering in Japan. The dam's continued operation demonstrates the durability of its construction and the ongoing relevance of hydroelectric power in the region's energy mix. The location in Toyama Prefecture places it within a broader network of energy infrastructure that supports the industrial and residential needs of the area. The historical context of its construction between 1941 and 1943 aligns with the expansion of Japan's energy capabilities during that period. The commissioning in 1944 marks the formal start of its contribution to the national grid. The Toga Dam remains a functional and important asset in the hydroelectric landscape of Japan.
Geography and Location
The Toga Dam is situated on the Togagawa River, located near the village of Omaki in Toyama Prefecture, Japan. The facility is positioned approximately 11 km (6.8 mi) southeast of Shogawa, establishing its specific geographic context within the regional hydrological network. As a gravity dam, the structure serves as a critical component of the local water management and energy infrastructure, leveraging the natural topography of the area to facilitate water diversion for power generation. The dam's primary function involves diverting water from the Togagawa River to the Omaki hydroelectric power station. This power station is located 4.3 km (2.7 mi) to the west of the dam. The water is ultimately directed onto the Shō River, integrating the Toga Dam into a broader system that utilizes multiple river courses for energy production. The precise positioning of the dam relative to Omaki village and Shogawa highlights its strategic placement for efficient water conveyance over the 4.3 km distance to the generating units.| Geographic Parameter | Value |
|---|---|
| Country | Japan |
| Prefecture | Toyama |
| Primary River | Togagawa River |
| Nearest Village | Omaki |
| Distance from Shogawa | 11 km (6.8 mi) southeast |
| Distance to Power Station | 4.3 km (2.7 mi) west |
| Destination River | Shō River |
History
The construction of the Toga Dam represents a significant early-20th-century infrastructure project in Toyama Prefecture, Japan. The facility was built as a gravity dam on the Togagawa River, strategically located near Omaki village. This site is situated approximately 11 km southeast of Shogawa. The primary engineering objective was to divert water resources to support regional hydroelectric generation. According to the, the physical construction of the dam structure took place between 1941 and 1943. This timeline places the project during the final years of the Taishō era and the early years of the Shōwa era, a period of rapid industrial expansion in Japan.
The dam's design focuses on water diversion rather than direct turbine housing. It channels water from the Togagawa River to the Omaki hydroelectric power station. The power station is located 4.3 km to the west, situated on the Shō River. This layout required careful planning to manage the elevation and flow rates necessary for efficient power generation. The construction period of 1941 to 1943 involved significant earthworks and concrete placement typical of gravity dam engineering of that era. The project was completed just prior to the dam's official commissioning.
The Toga Dam was commissioned in 1944. This date marks the official start of operational service for the facility. The commissioning coincided with the Omaki hydroelectric power station, which has an installed capacity of 17.6 MW. The integration of the dam and the power station created a cohesive hydroelectric system. The 17.6 MW capacity provided substantial power output for the region at the time of commissioning. The operational status of the dam remains active, continuing to serve its original purpose of water diversion for power generation. The longevity of the facility highlights the durability of the 1941–1943 construction efforts. No major structural modifications or capacity upgrades are detailed in the provided grounding for the initial commissioning phase. The dam continues to function as a critical component of the local energy infrastructure in Toyama Prefecture.
Engineering and Design
The Toga Dam is classified as a gravity dam, a structural design that relies primarily on its own weight to resist the horizontal force of the water. This engineering approach is characteristic of hydroelectric infrastructure in Japan’s mountainous terrain, where concrete gravity dams provide stability against the riverbed and abutments. Its primary hydraulic function is to divert water from the Togagawa River to the Omaki hydroelectric power station, which is located 4.3 km (2.7 mi) to the west on the Shō River.
Structural Construction and Timeline
Construction of the Toga Dam began in 1941 and was completed in 1943. The project was commissioned in 1944, marking the operational start of the water diversion system. The gravity design required significant concrete volume to maintain structural integrity during peak flow events and seasonal variations in the Togagawa River. The dam’s location approximately 11 km (6.8 mi) southeast of Shogawa was selected to optimize the hydraulic head and flow volume available for the downstream power generation facility.
Hydraulic Diversion System
The dam functions as a key component of a run-of-river or diversion-type hydroelectric scheme. Rather than storing large volumes of water in a reservoir for long-term storage, the Toga Dam captures flow from the Togagawa River and channels it toward the Omaki hydroelectric power station. This station has an installed capacity of 17.6 MW. The 4.3 km (2.7 mi) distance between the dam and the power station involves a conveyance system, likely including penstocks or canals, which transports the diverted water to the turbines located on the Shō River. This configuration allows the power station to utilize the elevation difference and flow rate to generate electricity efficiently.
Operational Context
Since its commissioning in 1944, the Toga Dam has remained operational, continuing to support the 17.6 MW Omaki hydroelectric power station. The gravity dam structure has withstood decades of hydraulic loading and environmental conditions in Toyama Prefecture. The system exemplifies mid-20th-century Japanese hydroelectric engineering, which focused on leveraging local river systems for regional power generation. The dam’s ongoing operation highlights the durability of gravity dam designs in stable geological settings and the sustained utility of diverted flow systems in Japan’s energy infrastructure.
Hydroelectric Operations
The Toga Dam functions as a critical infrastructure component within a regional hydroelectric network in Toyama Prefecture, Japan. As a gravity dam situated on the Togagawa River, its primary operational purpose is the diversion of water to generate electricity at a downstream facility. The dam is located near Omaki village, approximately 11 km southeast of Shogawa. This strategic positioning allows for the efficient capture and redirection of water resources from the Togagawa River system to the Shō River basin, facilitating power generation through a combined dam and power station configuration.
Water Diversion and Infrastructure Layout
The operational model of the Toga Dam relies on a diversion system that transports water from the dam site to the generating station. Water diverted from the Togagawa River travels a distance of 4.3 km to the west, reaching the Omaki hydroelectric power station. This station is located on the Shō River. The spatial separation between the dam and the power station is a defining characteristic of the facility's engineering design, utilizing the topography of the region to create the necessary head for hydroelectric generation. The diversion infrastructure connects the two key components, ensuring a steady flow of water from the reservoir or river intake at Toga Dam to the turbines at Omaki.
Power Generation Capacity
This capacity represents the output potential of the hydroelectric unit driven by the water flow from the Togagawa River. The power station was commissioned in 1944, marking the beginning of its operational history. The construction of the dam itself took place between 1941 and 1943, preceding the commissioning of the power station by one year. The facility remains operational, contributing to the energy infrastructure of Toyama Prefecture. The 17.6 MW capacity is a specific metric of the plant's output, derived from the hydraulic power harnessed by the diversion system established by the Toga Dam. The integration of the gravity dam on the Togagawa River and the power station on the Shō River creates a cohesive hydroelectric unit that has been in service since the mid-20th century.
What is the significance of Toga Dam in Toyama's energy history?
The Toga Dam represents a foundational element in the regional energy infrastructure of Toyama Prefecture, Japan. As a gravity dam located on the Togagawa River near Omaki village, it serves as the primary water diversion structure for the Omaki hydroelectric power station. Its construction and subsequent commissioning reflect the strategic expansion of Japan's hydroelectric capacity during the mid-20th century, specifically targeting the harnessing of local river systems for consistent power generation.
The operational significance of the Toga Dam lies in its ability to divert water to the 17.6 MW Omaki hydroelectric power station. This configuration illustrates a classic run-of-river or diversionary hydroelectric scheme, where the dam does not necessarily house the turbines but rather manages the flow to a downstream generating unit. The 17.6 MW capacity contributed to the local grid stability in Toyama Prefecture, providing a reliable source of renewable energy derived from the water resources of the Togagawa and Shō River systems.
Construction and Commissioning Timeline
The development of the Toga Dam occurred during a period of significant industrial growth in Japan. The construction phase began in 1941 and concluded in 1943. The facility was officially commissioned in 1944, bringing the hydroelectric infrastructure online during a critical period in Japanese history. This timeline underscores the engineering efforts directed toward energy self-sufficiency and regional development in Toyama Prefecture.
| Year | Event |
|---|---|
| 1941 | Construction of the Toga Dam begins. |
| 1943 | Construction of the Toga Dam concludes. |
| 1944 | The Toga Dam is commissioned, diverting water to the 17.6 MW Omaki hydroelectric power station. |
The Toga Dam remains an operational asset within Japan's hydroelectric network. Its continued function highlights the durability of gravity dam engineering and the sustained importance of the Togagawa River's water resources for energy production in the region. The facility's location near Omaki village and its connection to the Shō River demonstrate the integrated approach to water management and power generation that characterized Japan's early hydroelectric development strategies.
Why does Toga Dam matter for local infrastructure?
The Toga Dam serves as a critical piece of infrastructure for the water management and energy supply of the Omaki village area in Toyama Prefecture, Japan. As a gravity dam located on the Togagawa River, it plays a specific role in the regional hydroelectric network by facilitating water diversion to the Omaki hydroelectric power station. This station, situated 4.3 km (2.7 mi) to the west on the Shō River, has an installed capacity of 17.6 MW and was commissioned in 1944. The construction of the dam, which took place between 1941 and 1943, represents a significant mid-20th-century engineering effort to harness the water resources of the Shō River basin for local power generation.Role in Regional Water Management
The primary function of the Toga Dam is to divert water from the Togagawa River to the Shō River system. This diversion is essential for the operation of the Omaki hydroelectric power station, which relies on the consistent water flow provided by the dam. The dam's location near Omaki village, approximately 11 km (6.8 mi) southeast of Shogawa, allows it to effectively capture and manage water resources from the Togagawa River, contributing to the broader water management strategy of the region. By controlling the flow of water, the dam helps ensure a steady supply for the power station, which in turn provides a reliable source of hydroelectric energy for the local grid.
Significance for Omaki Village
For Omaki village, the Toga Dam and the associated Omaki hydroelectric power station are important local infrastructure assets. The 17.6 MW capacity of the power station provides a notable contribution to the energy mix of the area, supporting local consumption and potentially feeding into the wider regional grid. The dam's construction during the early 1940s reflects the historical development of hydroelectric power in Toyama Prefecture, leveraging the natural topography and water resources of the Shō River basin. This infrastructure not only provides energy but also plays a role in the local economy and water resource management, highlighting the integrated approach to utilizing the Togagawa and Shō Rivers for sustainable power generation.