عنوان مقاله [English]
The Dasht-e-Abass plain is located in the south of Ilam Province. There is not any permanent river in this plain, therefore, excessive exploitation from the Dasht-e-Abass aquifer has been extended. Therefore, water level has been decreased so that annual average rate of water level drawdown from October 1985 to February 2005 has been 0.27 meter. The rate of water level drawdown due to non-equal distribution of exploitation wells is different, therefore, groundwater flow has been reversed in some parts of the aquifer. Water transfer from Karkheh dam reservoir to the south of Dasht-e-Abass was started in February 2005 and thereafter water level was increased so that in some parts of the aquifer the rate of water level rise is up to 19 meters until September 2014. By development of Dasht-e-Abass irrigation and drainage network at the north of plain, input water from Karkheh dam to Dasht-e-Abass increased and thereby water level increased significantly. Since the drainage system for Dasht-e-Abass is not designed and hydrogeologically the Dasht-e-Abass Plain is a closed-aquifer, therefore, a wide part of farmlands will be waterlogged in the near future. To avoid of this problem, the best solution is combinational exploitation and simultaneity of groundwater and surface water exploitation.