Name: Silin Dam: Hydroelectric Infrastructure on the Wu River
Address: CN

Overview

The Silin Dam is a concrete gravity dam and hydroelectric power station located in Sinan County, Guizhou Province, China. Situated on the Wu River, the facility serves as a significant infrastructure project for regional energy generation and water management. The dam is constructed using roller-compacted concrete, a technique that provides structural integrity and efficiency for large-scale gravity dams. Its design incorporates a ship lift, enhancing navigability on the Wu River and supporting local and regional transport logistics. The project represents a key component of the Wu River’s hydroelectric development, contributing to the energy mix of Guizhou Province.

The hydroelectric power plant associated with the Silin Dam has an installed capacity of 1,080 MW. This capacity is generated by four Francis turbine-generators, each rated at 270 MW. The Francis turbine is a widely used technology in hydroelectric projects, known for its efficiency across a range of heads and flow rates. The dam itself measures 310 m in length and 117 m in height, forming a substantial barrier across the river. The reservoir created by the dam has a total storage capacity of 1,205,000,000 m³, with 184,000,000 m³ designated specifically for flood storage. This flood storage capacity helps mitigate downstream flooding risks, particularly during the rainy season in Guizhou.

Construction of the Silin Dam began in October 2004. The dam started impounding the Wu River in March 2008, marking a significant milestone in the project’s timeline. The first generator of the power plant became operational in May 2009, followed by the remaining three generators by December 2009. The dam is currently operational, contributing to the regional grid and supporting local water management needs. The project’s completion within a relatively short timeframe reflects the efficiency of the construction process and the strategic importance of the facility for Guizhou Province.

Engineering and Technical Specifications

The Silin Dam is a concrete gravity structure located on the Wu River in Sinan County, Guizhou Province, China. The dam is constructed using roller-compacted concrete and measures 310 m in length and 117 m in height. Its design incorporates a reservoir with a total capacity of 1,205,000,000 m3, of which 184,000,000 m3 is designated for flood storage. The associated hydroelectric power plant has an installed capacity of 1,080 MW, utilizing four Francis turbine-generators, each rated at 270 MW. The dam also features a ship lift to facilitate navigation on the Wu River.

Dam and Reservoir Specifications

The dam's structural integrity relies on its roller-compacted concrete composition, a technique that allows for efficient construction of large gravity dams. The reservoir created by the dam plays a critical role in water management along the Wu River. The total storage capacity of 1,205,000,000 m3 provides significant water retention for hydroelectric generation and flood control. The allocated flood storage of 184,000,000 m3 helps mitigate downstream flooding during peak flow periods.

Hydroelectric Power Plant Details

The power plant generates electricity through four Francis turbine-generators. Each turbine has a capacity of 270 MW, contributing to the plant's total installed capacity of 1,080 MW. The river was first impounded in March 2008, allowing for the gradual filling of the reservoir.

Technical Parameters Table

Parameter	Value
Dam Type	Concrete gravity (roller-compacted concrete)
Length	310 m
Height	117 m
Reservoir Total Capacity	1,205,000,000 m3
Flood Storage Capacity	184,000,000 m3
Installed Capacity	1,080 MW
Turbine Type	Francis
Number of Turbines	4
Capacity per Turbine	270 MW
Construction Start	October 2004
First Generator Operational	May 2009
Full Commissioning	December 2009
Additional Features	Ship lift

Construction History and Timeline

The construction of the Silin Dam followed a defined chronological sequence, beginning in the mid-2000s. Work on the concrete gravity structure commenced in October 2004. The project utilized roller-compacted concrete for the dam body, which was designed to be 310 meters long and 117 meters high. This construction phase laid the foundation for the associated hydroelectric power plant, which was engineered to house four Francis turbine-generators. A critical milestone in the construction timeline occurred in March 2008, when the dam began to impound the Wu River. This event marked the transition from structural erection to reservoir filling, allowing the water levels to rise to operational heights. The impoundment process prepared the site for the mechanical installation and testing of the hydroelectric units. The reservoir, with a total capacity of 1,205,000,000 cubic meters, started to accumulate water, with 184,000,000 cubic meters allocated specifically for flood storage. The commissioning of the power plant's generating units took place shortly after the initial impoundment. By May 2009, the first generator was declared operational, signaling the start of power production. The remaining three generators followed suit, with all units becoming operational by December 2009. This rapid commissioning schedule meant that the full installed capacity of 1,080 MW was achieved within a few months of the first unit's startup. The completion of the generators also finalized the primary functional components of the dam, including the ship lift facility.

Year	Event
2004	Construction begins in October
2008	Dam begins to impound the Wu River in March
2009	First generator operational in May; remaining generators operational by December

How does the Silin Dam manage water storage and flood control?

The Silin Dam serves as a critical node in the water management infrastructure of the Wu River in Sinan County, Guizhou Province, China. Its design integrates substantial water storage capabilities to support both consistent hydroelectric power generation and effective flood control for the surrounding region. The dam creates a reservoir with a total capacity of 1,205,000,000 m3 (976,909 acre⋅ft), which acts as the primary source for the 1,080 MW hydroelectric power plant. This large volume of stored water ensures a steady supply for the four 270 MW Francis turbine-generators, allowing for flexible energy output depending on seasonal water availability and demand.

Flood Storage Capacity

A significant portion of the reservoir's volume is dedicated specifically to flood mitigation. Within the total 1,205,000,000 m3 capacity, 184,000,000 m3 (149,171 acre⋅ft) is designated as flood storage. This dedicated space allows the dam to absorb excess water during peak flow periods on the Wu River, reducing the downstream impact of seasonal rains and sudden inflows. By managing these volumes, the concrete gravity dam helps stabilize water levels, protecting the Sinan County area and downstream communities from potential inundation.

Operational Integration

The management of water storage is closely tied to the operational timeline of the dam. Construction began in October 2004, and the dam began to impound the river in March 2008. By May 2009, the first generator was operational, with the remaining units coming online by December 2009. The integration of flood storage and power generation requires careful balancing of the reservoir levels. The roller-compacted concrete structure, which is 310 m (1,017 ft) long and 117 m (384 ft) high, provides the structural integrity needed to hold these significant water volumes. Additionally, the dam supports a ship lift, indicating that water level management also considers navigation needs on the Wu River, further demonstrating the multi-functional use of the stored water.

What is the significance of the ship lift at Silin Dam?

The Silin Dam incorporates a ship lift, a critical piece of navigation infrastructure designed to maintain and enhance river transport capabilities on the Wu River. This feature allows vessels to bypass the dam structure, thereby preserving the continuity of the waterway for commercial and regional traffic. The inclusion of a ship lift is a significant engineering decision, as it transforms the hydroelectric facility from a simple barrier into a multifunctional node that supports both energy generation and logistics. The Wu River serves as a vital transportation corridor in Guizhou Province, China. By integrating a ship lift, the Silin Dam ensures that the flow of goods and materials is not disrupted by the 117 m (384 ft) height of the concrete gravity dam. This infrastructure supports regional connectivity, linking upstream and downstream communities and industrial zones. The ability to move ships vertically over the dam reduces the reliance on road or rail transport for certain bulk commodities, potentially lowering logistical costs and improving supply chain efficiency in the Sinan County area and beyond. The ship lift operates in conjunction with the dam's primary hydroelectric functions. The dam utilizes four 270 MW Francis turbine-generators to produce a total capacity of 1,080 MW. The navigation infrastructure is designed to coexist with these power generation units, ensuring that water management for power production does not unduly hinder river traffic. The reservoir, with a total capacity of 1,205,000,000 m³, provides a stable water level that facilitates the operation of the ship lift. Of this total volume, 184,000,000 m³ is designated as flood storage, which helps regulate water flow and maintain consistent conditions for navigation. Construction of the Silin Dam began in October 2004, with the dam beginning to impound the river in March 2008. By May 2009, the first generator was operational, and the remaining generators came online by December 2009. The ship lift was part of this comprehensive development, reflecting a strategic approach to infrastructure that balances energy needs with transportation demands. The dam is composed of roller-compacted concrete and spans 310 m (1,017 ft) in length. This robust construction supports the heavy loads and mechanical operations required by the ship lift, ensuring long-term reliability and efficiency. The presence of the ship lift at Silin Dam highlights the importance of integrated water resource management in China's energy infrastructure. It demonstrates how modern hydroelectric projects can serve multiple purposes, contributing to economic development through enhanced connectivity and efficient resource utilization. This multifunctional approach is essential for maximizing the benefits of large-scale infrastructure investments, particularly in regions like Guizhou, where the Wu River plays a central role in local and regional economies.

Why it matters

The Silin Dam represents a significant engineering achievement within the Wu River basin, serving as a critical node in Guizhou Province’s hydroelectric infrastructure network. As a concrete gravity structure composed of roller-compacted concrete, the dam’s 117 m height and 310 m length provide substantial water retention capabilities, essential for regulating flow in this region of China. The project’s primary function is power generation, with an installed capacity of 1,080 MW delivered through four 270 MW Francis turbine-generators. This output contributes directly to the regional grid stability and the broader renewable energy mix in southwestern China, leveraging the natural hydraulic head of the Wu River.

Regional Development and Multi-Functional Utility

Beyond electricity generation, the Silin Dam plays a vital role in regional development through its multi-functional design. The reservoir, with a total capacity of 1,205,000,000 m³, includes 184,000,000 m³ dedicated to flood storage. This flood control capacity is crucial for mitigating seasonal water surges in the Wu River basin, protecting downstream communities and agricultural lands in Sinan County. Additionally, the dam supports a ship lift, enhancing navigability on the Wu River and facilitating inland water transport. This integration of power, flood control, and navigation underscores the dam’s strategic importance in optimizing resource utilization in Guizhou Province.

Construction Timeline and Operational Impact

The development of the Silin Dam followed a structured construction phase, beginning in October 2004. The river began to impound in March 2008, marking a key milestone in the project’s progression. This relatively swift commissioning period reflects efficient project management and engineering execution. The dam’s operational status since 2009 has provided a consistent renewable energy source, supporting local economic growth and energy security in Guizhou Province. The use of roller-compacted concrete technology also highlights advancements in dam construction methods, offering durability and cost-effectiveness for large-scale hydroelectric projects in mountainous terrains.

Applications and Regional Impact

The Silin Dam serves as a critical infrastructure node for the Wu River basin, integrating hydroelectric generation, flood control, and navigation to support the economic development of Sinan County and the broader Guizhou Province. The facility's primary function is power generation, contributing 1,080 MW to the regional grid through its four 270 MW Francis turbine-generators. This capacity provides a stable baseload and peaking power source for Guizhou, a province characterized by significant topographical variation and growing industrial energy demand. The operational status of the plant, which saw its first generator come online in May 2009 and achieved full capacity by December 2009, ensures consistent energy supply to local municipalities and industrial zones along the river corridor.

Flood Mitigation and Reservoir Management

Beyond energy production, the dam plays a vital role in hydrological management for the Wu River. This significant flood storage capability allows for the regulation of seasonal water flows, reducing the frequency and severity of downstream flooding in Sinan County. By impounding the river starting in March 2008, the dam creates a buffer against peak discharge events, protecting agricultural land, residential areas, and infrastructure located along the riverbanks. The roller-compacted concrete construction of the 310 m long and 117 m high structure ensures durability and efficient water retention, supporting long-term flood control strategies in the region.

The Silin Dam also enhances navigational infrastructure on the Wu River through the integration of a ship lift. This feature improves inland water transport connectivity, facilitating the movement of goods and reducing reliance on road and rail networks for bulk commodities. The ship lift allows vessels to bypass the dam's height, maintaining a continuous waterway that supports local trade and logistics. This improvement in navigation infrastructure contributes to the economic integration of Sinan County with other parts of Guizhou Province, fostering regional commerce and providing a more efficient transport corridor for the surrounding communities. The combination of power, flood control, and navigation makes the Silin Dam a multi-purpose asset critical to the regional infrastructure landscape.

Silin Dam: Hydroelectric Infrastructure on the Wu River