It is around two years that Iran's ministry of water and energy is looking for a remediation to salty Gotvand dam. The dam reservoir is placed on geological formation known as "Gachsaran". This formation is completely repleted by structures out of salt, which has changed the quality of water inside the reservoir. This dam is placed in Karoon basin beside Karkhe basin located in the center and south-western of the country. A schematic figure of reservoirs and the drainage system is attached to questions . Any help and notion is appreciated.
It would be helpfull if you could be more specific on the problem that needs to be solved. The information you are providing is of general nature. Another thing that would be helpfull would be to provide some stratological description of the formation and its spatial relation to the reservoir.
If for example the problem at stake is the high salinity caused by disolution of this formation and the formation "touches" extensive areas of the reservoir at high water levels, one alternative could be to operate the reservoir (lower its level) so as to minimize contact area; that is of course if the economical losses from energy production are deemed to be acceptable. But again, this is only a wild guess without much thought, since there is no precise information. If you are more clear about your request and provide more information, you are likely to get better answers.
What you can do is prevent all surface run off coming to your Gotvand tank and augment it with krkhe and Dez tanks by constructing a canal. This will minimize your problem.
Because of the special orogeraphy of the area it is not cost-effective to construct canals to transfer water from Abaspour dam to Dez or Karkheh dams. Therefore, keeping the water table of Gotvand dam at its lowest or even making the dam off can be an initial solution. However as Rafael mentioned to get more comprehensive answer, you need to provide more sufficient information, especially watet quality data.
If it is difficult to construct canals, there may be a possibility to divert runoff or overland flow generated over soils having less or minimum salt within the same basin. If so you all can disconnect all environmental flows coming from soils having high salt levels with the community participation.
But what I think is, when your environment is concern, there must be a way to supply continuous water via a pipe line from Dez or Karkhen. If you augment the Gotvand reservoir, in the long run it could be a massive benefit for the entire ecosystem. This augmentation will definitely improve the ground water quality, quantity and bio diversity.
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