Upper Gotvand Dam
Downstream of the Upper Gotvand Dam is the 22 m (72 ft) high Lower Gotvand Dam at 32°16′32.51″N 48°50′8.52″E / 32.2756972°N 48.8357000°E. Constructed from 1975 to 1977, it serves to divert portions of the river into two canals for the irrigation of 42,000 ha (100,000 acres) of farmland.
Objectives of dam construction
The goals of building this dam are:
- Hydroelectric energy production of 4500 gigawatt hours per year.
- Control of seasonal and destructive Karun river floods.
- Regulation of downstream agricultural water.
- Tourist attractions.
Challenges
Before the water extraction of this dam, one of the important debates and disagreements surrounding the construction of this dam was that in the downstream part of this dam, the ground has salt veins and this can cause the saltiness of the water used by the cities and villages downstream. Engineer Meshkat, a geologist and a member of the team that prepared the geological map of the dam, said that the design team was aware of the problem of the dam lake being located on salt masses. Also, Isa Kalantari, the former head of the Environmental Protection Organization, says: Before the revolution, the Americans examined the Gotvand dam from an environmental point of view and decided to build the dam 15 kilometers higher. He believes that the executors of the Gotvand dam project should be tried for the error in the implementation of this project. He said to the students of Tehran University Geography Faculty and environmental activists: "The salinity of the water below the dam is 5.5 times the salinity of the water in the Persian Gulf, and nothing can be done to solve this problem."
The effect of the Gotvand Dam on the salinity of the Karun River
Since before and after the water intake of Gotvand Dam, there have been criticisms about the salinization of the water of the Karun River by the lake of this dam due to its location on the Gachsaran formation and its proximity to the salt mountains. These criticisms had caused widespread concerns, and as a result, the dam's water intake had been postponed several times.
Theories about dam environmental issues
- Mehdi Qomshi, professor of water engineering at Chamran University of Ahvaz, says that the Gotvand dam will act like a time bomb.
- In the report related to the water institute of Tehran University, two national mistakes are pointed out: "Determining the axis of the dam without conducting water quality studies" and "Taking water from the dam despite the official opposition of the Environmental Organization and the letter of the National Inspection Organization".