Assessment of groundwater quality in Idleb city using GIS

Water is the most important element on this Earth and water quality is very sensitive issue that affect application of water for different purposes. Deterioration quality of ground water has been raised as big concern in the last four years especially in Northern and Eastern parts of Syria. In this study, quality of ground water has been checked and evaluated for Idleb City as case study using Geostatistical analyst tool - Ordinary Kriging method - in Geographic Information systems -GIS Softer ware. Estimation maps showing the spatial distribution of the 10 parameters found in these reports were generated by using chemical analysis reports of 13 wells in Idleb City. These parameters are Ca+2 (Calcium), Mg+2 (Magnesium), Cl- (Chloride), SO4-2 (Sulphate), NO3- (Nitrate), F- (Fluoride), pH, EC (Electrical Conductivity), TDS (Total Dissolved Solid), and Total Hardness. Data exploration process was investigated before modelling. Three Models of (Spherical, Gaussian, and Exponential) were applied for each parameter in predicted maps. These models were compared for each parameter and the best fit model was selected based on the Root Mean Square Error- RMSE criteria. Then, water quality maps were produced using the best selected Model. Results show that chemical values for ten parameters are found to be within WHO World Health Organization and Syrian standard in Idleb City and ground water is safe and suitable for drinking.