Doroodzan Dam: Hydroelectric and Irrigation Infrastructure in Fars Province

Overview

Doroodzan Dam is an operational hydroelectric powerplant located in Marvdasht County, within Fars Province, Iran. The facility is situated on the Kor River, approximately 85 kilometres north of the city of Shiraz. Constructed as an earthen embankment dam, the structure serves a dual purpose in the region's energy and water infrastructure. It functions primarily as a water management asset, providing critical irrigation water storage, flood control, and municipal water storage for the surrounding areas. In addition to its hydraulic functions, the dam houses a hydroelectric generating station with an installed electricity generating capability of 10 MW, contributing to the local power supply.

The dam was completed in 1974, establishing a key infrastructure node in the Fars Province water network. While the primary design focus was on water storage for agricultural and municipal use, the integration of a 10 MW hydroelectric capacity allows for consistent power generation from the Kor River's flow. The facility remains operational, continuing to support both the energy needs and the water security of the region. The earthen construction method was chosen to accommodate the topographical and geological characteristics of the Kor River valley, ensuring stability and effective water retention for the diverse uses of the stored water.

History and Construction

The Doroodzan Dam, located in Fars province, Iran, serves as a multi-purpose infrastructure asset providing irrigation water storage, flood control, and municipal water supply, alongside its role as a hydroelectric powerplant with an installed capacity of 10 MW. The facility is an earthen dam situated approximately 85 kilometres north of Shiraz. While the provided operational data indicates a commissioning year of 1971, authoritative records state the dam was completed in 1974. This discrepancy may reflect the distinction between the initial start of commercial hydroelectric operations and the final completion of the entire civil engineering structure.

Construction Timeline and Engineering Context

The construction of the Doroodzan Dam took place during a period of significant infrastructure development in Iran, particularly within the Fars province. The project was designed to address regional water management needs, combining agricultural support through irrigation storage with urban supply for municipal use. The dam’s primary function remains water storage, with flood control being a critical secondary benefit for the surrounding areas near Shiraz.

The hydroelectric component, generating 10 MW of electricity, was integrated into the facility’s design to maximize the utility of the stored water. The completion of the dam in 1974 marked the culmination of the construction efforts, establishing the Doroodzan Dam as a key piece of energy and water infrastructure in the region. The facility continues to operate as an active hydroelectric powerplant and water reservoir.

Why it matters

The Doroodzan Dam serves as a critical infrastructure node for water security in Fars province, Iran. Located approximately 85 kilometres north of Shiraz, this earthen dam was completed in 1974 to address the region's need for reliable water storage. Its primary design objectives include irrigation water storage, flood control, and municipal water supply, making it a multi-functional asset for the surrounding agricultural and urban areas.

Regional Water Security and Supply

For the cities of Shiraz and Marvdasht, the Doroodzan Dam provides essential municipal water storage. In a region where water scarcity can impact both agriculture and urban consumption, the dam's capacity to store water ensures a more stable supply for local populations. The facility's role in flood control is equally important, mitigating the impact of seasonal water surges that can affect downstream communities and agricultural lands.

Hydroelectric Contribution

In addition to its water management functions, the Doroodzan Dam contributes to the regional energy mix with an installed electricity generating capability of 10 MW. This hydroelectric output, while modest compared to larger regional projects, provides a renewable energy source that complements the primary water storage functions. The dam's operational status remains active, continuing to serve its intended purposes since its completion.

The strategic importance of the Doroodzan Dam lies in its multi-purpose design, addressing both water and energy needs in the Fars province. Its continued operation supports the regional economy and water security, demonstrating the value of integrated water resource management in Iran's infrastructure planning.

Hydrology and Water Resources

The Doroodzan Dam is situated within the Kor River watershed, a critical hydrological basin in Fars province, Iran. This watershed provides the primary water source for the facility, which serves multiple functions including irrigation, flood control, and municipal supply. The hydrological characteristics of the Kor River directly influence the operational management of the reservoir and its 10 MW hydroelectric generating capacity.

Watershed Characteristics

The Kor River basin presents specific hydrological metrics that define the water availability for the Doroodzan reservoir. Understanding these parameters is essential for effective reservoir management and water allocation strategies in the region.

Impact on Reservoir Management

The average annual rainfall of 485 mm across the 4372 km2 watershed area contributes to the total inflow into the reservoir. The average annual flow of 1192 MCM represents the primary volume of water available for distribution among the dam's various uses. This flow must be balanced against the average annual evaporation loss of 64 MCM, which reduces the net available water storage.

Reservoir management strategies must account for the variability in these hydrological factors. The earthen dam structure, completed in 1974, is designed to store water for irrigation and municipal supply while maintaining sufficient head for hydroelectric power generation. The balance between inflow, evaporation, and outflow determines the operational flexibility of the facility in meeting the diverse water demands of the surrounding region in Fars province.

How does the hydroelectric generation work?

Doroodzan Dam functions as a multi-purpose water resource infrastructure project located in Fars province, Iran, approximately 85 kilometres north of Shiraz. While its primary design objectives center on irrigation water storage, flood control, and municipal water supply, the facility incorporates a hydroelectric power generation component with an installed capacity of 10 MW. The dam structure itself is an earthen embankment, a construction type that significantly influences the hydraulic and mechanical configuration of the power generation system compared to concrete gravity or arch dams.

Integration of Hydroelectric Generation with Water Storage

The 10 MW electricity generating capability is integrated into a facility primarily optimized for water volume retention rather than maximum hydraulic head exploitation. In multi-purpose earthen dams, the hydroelectric plant is typically designed to utilize the natural flow and regulated release of water required for downstream irrigation and municipal needs. This integration means that power generation is often secondary to the hydraulic regime dictated by agricultural cycles and flood control requirements. The water stored in the reservoir created by the earthen embankment is released through penstocks or outlet works to drive turbines, converting the potential energy of the stored water into electrical energy.

The operational status of the plant is listed as operational, having been completed in 1974, with a commissioned date noted as 1971 in structured data records. The relatively modest 10 MW capacity suggests that the hydroelectric component serves as a value-added feature to the primary water storage functions, likely utilizing a run-of-river or regulated flow approach rather than a large-scale pumped storage or high-head reservoir system. This design choice is consistent with earthen dams, which often span wider valleys with lower gradients, resulting in a lower hydraulic head compared to concrete dams built in narrower, steeper gorges.

Impact of Earthen Dam Structure on Efficiency

The classification of Doroodzan as an earthen dam dictates specific engineering constraints for the hydroelectric plant. Earthen embankments are generally less permeable to water than concrete structures, requiring specific intake and outlet configurations to manage seepage and maintain structural integrity. The power house is typically located at the toe of the dam or adjacent to the outlet works, where water is drawn from the reservoir and channeled through turbines. The efficiency of the 10 MW installation is influenced by the head available, which is determined by the height of the earthen embankment and the water level in the reservoir. Unlike high-head concrete dams that can generate significant power from relatively low flow rates, the 10 MW capacity at Doroodzan likely relies on a combination of moderate head and substantial flow volumes, aligning with the irrigation and municipal storage volumes managed by the facility.

The flood control function further impacts the operational profile of the hydroelectric generation. During periods of high inflow, water may be released through spillways or low-level outlets to manage reservoir levels, potentially passing through the turbines to maximize energy capture or bypassing them if the flow exceeds the turbine's optimal range. This dynamic operation ensures that the primary objectives of flood mitigation and water storage are maintained while generating a consistent, albeit secondary, output of 10 MW of electricity for the regional grid. The facility's completion in 1974 marks the maturation of this integrated water-energy infrastructure in the Fars province, serving both the agricultural and municipal sectors while contributing to the regional energy mix.

What are the primary uses of the reservoir?

The Doroodzan Dam functions as a multi-purpose infrastructure asset, with water management serving as its primary operational driver. While the facility includes a 10 MW hydroelectric power generation capability, its design prioritizes agricultural support, municipal supply, and flood mitigation for the surrounding Fars province region. The reservoir's storage capacity is strategically allocated to support the economic and residential needs of the area north of Shiraz.

Agricultural Irrigation

The dominant use of the Doroodzan reservoir is agricultural irrigation. The dam supports the cultivation of approximately 110,000 hectares of farmland in the region. This extensive irrigation network is critical for local agricultural productivity, providing consistent water access for crops in the semi-arid climate of Fars province. The stability of water supply directly impacts the yield and variety of crops grown in the surrounding districts, making the dam a cornerstone of the local agrarian economy.

Municipal and Industrial Water Supply

Beyond agriculture, the reservoir provides essential municipal water services to several key population centers. The facility supplies drinking water to the cities of Marvdasht, Zaghan, and Shiraz. This municipal allocation ensures water security for urban residents and supports industrial activities within these towns. The proximity of the dam, located about 85 kilometres north of Shiraz, facilitates efficient distribution to these major urban nodes, reducing the reliance on more distant water sources for the city's growing population.

Flood Control

Flood control is another critical function of the Doroodzan Dam. By regulating the flow of the river, the earthen structure mitigates the risk of downstream flooding, protecting both agricultural lands and urban infrastructure. This flood mitigation capability is particularly important during seasonal rainfall events, where unregulated water flow could cause significant damage to the regions of Marvdasht and Zaghan.

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