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In this section the project is introduced in form of following items:
The utilization of the allocated water for agricultural purposes of Bushehr Province land on the Liravi Plain is the main objective of the project and the secondary objective is to produce hydroelectric power. Generally, on the basis of the allocated water, a portion of water released by Chamshir Dam is diverted by a regulating-diversion dam and through a transmission system (including tunnel and pipeline systems) will be transmitted to the power plant and finally irrigation and drainage network.
History and background
The feasibility stage of the irrigation and drainage network of Chamshir project was started from 1995 and approved by previous client, Fars, Bushehr and Kohgilooyeh Regional Company in 2005. Afterward, the detail design studies completed and approved at 2012 and approved by current client, Iran Water and Power resources Development Company. It is noted that, while operating of this national project is achieved, more than 36,000 hectares of high potentially south land of the country will be cultivated and irrigated. Economical, social, political and cultural benefits of this project will boost the whole region and certainly the country.
Location and general layout
Irrigation and drainage network of Chamshir project contains several components such as diversion-regulating dam, tunnel, pipeline systems, hydroelectric power plant and irrigation-drainage canals which make it completely different from other national civil projects. Chamshir diversion-regulating dam is located at 70km downstream of Chamshir Dam, over the Zohreh River before the confluence of Zohreh and Kheirabad River, in Khuzestan Province. Chamshir diversion-regulating dam will transmit water to the lands of Deilam and Ganaveh in Bushehr Province by means of tunnel, pipelines system and irrigation and drainage canals.
River specifications
Zohreh River is one of the rivers in the Hendijan-Jarahi catchment. This catchment with 40788 square kilometer area has many sub-basins. Zohreh River catchment has been located in the south of Iran nearby to Maron and Jarahi basin, Karoon and Kor basin and watercourses of Deilam and Ganaveh from north, east and south respectively.Ardakan (in Fars Province), Poldasht-e-NorAbad, Dogonbadan, Hendijan and Dehdasht cities are situated in this catchment. Area of Zohreh River catchment is about 15460 square kilometer including mountain regions and foothills and plain regions with an area of 10600 and 4860 square kilometers area, respectively. This river is composed of two main branches, Fahlian and Kheirabad. The first branch of this river is known as Ardakan at the beginning and then renames to Fahlian. Another branch of this river is called Shirin or Kheirabad and originated from the altitudes of Gachsaran and connected to the Zohreh River at a place called Heidar-e-Karrar. The mean annual river discharge of Fahlian River at Gachsaran hydrometric station and discharge of the Kheirabad River at Kheirabad Bridge is about 64 and 25 cubic meters per second, respectively. The total discharge of Zohreh (Hendijan) basin at Dehmolla hydrometric station has been estimated about 83 cubic meters per second.
Specifications of catchmnet area
Geographically, the study area is located at the range of 50˚ 17´ to 50˚ 55´ of east longitude and 30˚ 01´ to 30˚ 20´ of north latitude. In another word, the aforementioned area is a mid-catchment locating between Chamshir dam and diversion-regulating dam which discharged to Persian Gulf and Zohreh is the name of main river.
Subsequent objections
Due to the dry farming and husbandry are the main revenue sources and employment of the inhabitants, in the study area. Therefore, controlling, storaging, convoying and injecting water (which discharged to Persian Gulf) to this area would have significant influences. In this region, limitation of available water is the main obstacle to the development of agriculture. Water scarcity has caused that crop varieties has been limited to one or maybe two species in agriculture and horticulture lands, respectively. Therefore, the yields can only cover the residential necessities. By date, not only the yield but only the job opportunities are low. So, shifting /changing the region from dry forming to watered lands will cause increasing job rate and prohibiting migration that is the main /fundamental unemployment reason. Allocating sufficient water and portion of lands to cultivate alfalfa and clover, development of the livestock would be possible. It is possible to change the majority of the herd combination from goats and yeanling to sheep and lamb which makes less damage to pastures, by supplying the forage and changing the way of livestock. In addition to direct employment and income generation, growth of agriculture, horticulture and animal husbandry in the region helps to developing the product marketing activities and makes conditions to create small cottage industries in the fields of crops and livestock. Also, flood which destroyed the farms, installations and homes every few years, is prevented by controlling water.
Diversion-Regulating Dam, Transmission System, Power Plant and Irrigation - Drainage Network project of Chamshir has unique characteristics. All of the agricultural lands that will be benefited by this project are located in Bushehr Province and because of water scarcity and limited cultivable land in aforementioned province; this project will create a great revolution in this area. Hydroelectric power plant as a subsequent goal and newly irrigated lands are the coefficient reasons to justify the project economically. The annual transmitting water to specified area would be 514 million cubic meters. One of the exclusive characteristics of this project is the minimum social conflicts during the construction especially over the irrigation-drainage area and certainly in the power plant site, as the lands surrounded are worthless. So, in comparison with the same projects, this project has a higher economical index. Benefit to cost ratio (b/c) of the project, with annual discount rate 10%, is 1.68% and capital recovery factor would be 16.4%, while generating power incomes and without imposing other benefits has been implemented. It’s should be noted that, the irrigation and drainage network of Chamshir project is the first but not the last project in this filed which will be built by Water and Power Resources Development company of Iran.