In the project, general conditions of alluvial aquifer systems and wells supplying drinking water in Arak city and governed qualitative conditions has been investigated. effects of the transferred water from Kamal Saleh dam to the Arak aquifer also has been studied using observed time series from piezometers and wells during the past four years as well as the results of two periods inventory of all groundwater resources. Quantitative and Qualitative modeling with MODFLOW-2005 and MT3DMS codes has been carried out using GMS 10 software and hydrodynamic parameters of the aquifer has been calibrated.
one year, two years, three years, five years and ten years captured areas of pumping wells for suppling drinking water of Arak city was drawn using modeling results. Nitrate long-term emission scenarios sourced from residential areas was simulated by considering the city’s sewerage network development plans. Also 9 scenarios of stopping or reducing pumping programs were simulated by qualitative and quantitative models.
According to the results, 15 drinking water supplying wells with a net capacity of 561,000 cubic meters per month can be exploited in critical conditions. The simulation results of different scenarios have shown that except for Meghan margin, stopping pumping from wells caused no wetlands in residential areas of Arak and surrounding villages.
Due to the considerable extraction volume ratio of water for agricultural purposes and the basic role of this extraction in causing critical condition in term of quantitative and qualitative at Arak aquifer during the past few years, Given that in the current situation; a balance between quantitative-qualitative recovery of the aquifer potential compared with the exploitation volume does not exist. So most forcefully is proposed to increase agricultural efficiency and at least 20 percent reduction in the extraction of groundwater for agricultural use to be placed as the management priorities.Continued transition plans from KamalSaleh dam, industries and residential areas wastewater treatment and control of agricultural pollutants, especially in long-term capture zone of drinking water supplying wells are items that are recommended to improve aquifer’s condition and quality.