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| Dez Dam | |
|---|---|
| Name | Dez Dam |
| Official name | سد دز |
| Location | Khuzestan Province, Iran |
| Status | Operational |
| Construction begin | 1959 |
| Opening | 1963 |
| Owner | Ministry of Energy (Iran) |
| Dam type | Earth-fill embankment |
| Height | 203 m |
| Length | 480 m |
| Reservoir capacity | 3,340,000,000 m3 |
| Plant capacity | 520 MW |
Dez Dam is a large earth-fill embankment dam on the Dez River in Khuzestan Province, Iran, completed in the early 1960s. The structure serves multiple functions including flood control, irrigation, and hydroelectric power generation for Khuzestan Province, supplying water to agricultural zones around Ahvaz, Andimeshk, and Shush. The project involved collaborations and influences from international firms and national agencies associated with Pahlavi Iran development programs and later integration into post-revolutionary infrastructure managed by the Ministry of Energy (Iran).
The dam is situated upstream of the city of Andimeshk near the confluence region feeding the Tigris–Euphrates river system basin, and it created a large impoundment known locally as the Dez Reservoir. The facility is closely associated with regional projects such as the Karkheh Dam, Karun River developments, and national plans originating from the White Revolution era and post-Iran–Iraq War reconstruction efforts. Dez Dam is an important asset within Iran’s network of hydraulic structures overseen by entities like the Iran Water and Power Resources Development Company and monitored by engineers trained at institutions such as Sharif University of Technology and University of Tehran.
Initial feasibility studies were influenced by mid-20th century advisors from European and North American firms, with contracts and design input linked to engineering consultancies from France, Italy, and the United States. Construction began in 1959 under direction aligned with the Pahlavi dynasty’s modernization ambitions and was completed in 1963, coinciding with other regional works like the Karun-3 Dam planning. During the Iranian Revolution and the later Iran–Iraq War, the dam and its workforce were subjects of national security priorities and reconstruction programs administered by organizations such as the Islamic Revolutionary Guard Corps engineering units and civilian ministries. The site also attracted attention from international observers including UNESCO technical missions and foreign ministries during periods of repair and upgrade.
Dez Dam is an earth-fill embankment dam with a structural height of approximately 203 meters and a crest length around 480 meters, making it one of the tallest earth-fill dams globally at the time of completion. The design includes a central clay core, rockfill shells, drainage galleries, and an impervious cutoff extending into the foundation. The spillway and outlet works were designed to accommodate flood routing consistent with hydrological studies by agencies like United Nations Food and Agriculture Organization advisers and local hydrologists trained at Isfahan University of Technology. The hydroelectric plant houses Francis turbines rated to produce a combined installed capacity of about 520 megawatts, feeding the national grid administered by the Iran Grid Management Company and coordinated with regional substations near Ahvaz.
The impounded reservoir stores roughly 3.34 billion cubic meters, providing seasonal regulation for irrigation districts supplying the Khuzestan Plain, including support for cultivation of wheat, sugarcane, and date palm groves near municipalities like Shushtar and Gotvand. The power station’s units contribute peaking and base-load generation in tandem with thermal facilities such as the Ramin Power Plant and hydro plants on the Karun River system. Water allocation and reservoir operation follow policies set by the Ministry of Energy (Iran) and regional water boards, and are influenced by transboundary hydrology considerations associated with the greater Mesopotamian Basin.
Creation of the reservoir led to landscape changes affecting archaeological sites tied to ancient civilizations in Elam and the Susiana plain, prompting salvage archaeology coordinated with scholars from University of Tehran and international teams from museums and universities in France and Britain. The inundation and water diversion altered ecosystems, affecting wetlands connected to the Hawizeh Marshes and habitats for migratory birds monitored by conservation groups and researchers affiliated with IUCN and national departments. Social impacts included relocation of local communities around Andimeshk and resettlement policies overseen by agencies active during the Pahlavi dynasty and later periods; these processes intersected with tribal landholding patterns involving groups such as the Bakhtiari.
Operational management involves routine dam safety inspections, sediment management, and turbine overhauls conducted by personnel trained at technical institutes such as Amir Kabir University of Technology. Upgrades and rehabilitation works have been undertaken to address seismic standards referenced in international codes like those promoted by the International Commission on Large Dams and to mitigate siltation issues through coordinated sediment flushing and catchment management with the Iran Water Research Institute. Emergency preparedness integrates local authorities including Khuzestan Provincial Government and national emergency agencies.
The reservoir and surrounding landscapes have become a regional attraction for boating, angling, and cultural tourism linked to nearby heritage sites such as the Shushtar Historical Hydraulic System and ruins associated with Susa and Chogha Zanbil. Tourism promotion involves municipal bodies from Andimeshk and Dezful and private operators offering excursions that highlight both natural scenery and archaeological heritage. The area features festivals and cultural practices of local communities like the Bakhtiari and connections to national cultural institutions including the Iranian Cultural Heritage, Handicrafts and Tourism Organization.
Category:Dams in Iran Category:Hydroelectric power stations in Iran Category:Khuzestan Province