eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-06-21 12 Spl.Edn.2 507 515 10.13005/bbra/2227 13021 article Fatemeh Asadi 1 Mohamad Soltanian 1 Ahmad Mohmmadi 1 Parastoo Setareh 2 Seyed Mostafa Khezri 3 Environmental Health Engineering Department, Public Health School, Kermanshah university of Medical science, Iran. PhD student of Environmental engineering, Kermanshah University of Medical Sciences. Environmental engineering group associate professor, Department of Environment College of Electrical, Computer and Environment, West Tehran branch, Islamic Azad University Tehran, Iran. The use of geographic information systems (GIS) and in parallel, appropriate statistical methods for analysis and management of groundwater resources is growing rapidly. Exploit these new tools and backup systems for information processing can have a significant role in the management and control of resources especially for limited water supplies, which are very valuable and vital. The main purpose of this study is geographical zoning and physicochemical quality of annual changes in groundwater catchment Gharehsou period of ten years 2003-2012. Information on the physicochemical parameters of the experiment, were obtained from the regional water corporation. Using descriptive statistics, the average annual concentration of various parameters were calculated and then using the statistical software SPSS-Ver.16 and Friedman Test and Measure_1 test with a significance level of 05/0 = ? annual changes of parameters was compare accordingly and in its parallel using software ArcGIS9.3 performed geographical zoning parameters to determine the spatial variability of groundwater quality watershed in Gharehsou. The results showed that during the year under review, in the first five years, physicochemical parameters were increased with increasing trend and has decreased in the next five years, with annual fluctuations in total has decreased. According to the statistical tests used, annual changes in the parameters of potassium, calcium, chloride, conductivity, there is no significant difference )P val<0.05).Geographically, density and chemical concentration in groundwater concentrated in the North West, West and Southwest Basin. The greatest increase cations and anions, is corresponding to the years 87-1384. This study showed that most of the groundwater catchment area is made of bi carbonate. Changes in the chemical composition of groundwater catchment, depending on the amount of atmospheric fallout, water uptake and soil type. https://www.biotech-asia.org/vol12_nospl_edn2/geographical-zoning-physicochemical-quality-change-in-groundwater-catchment-gharehsou-ten-year-period-2003-2012/ Groundwater; Zoning geographic; Gharehsou area