Over 90% of the territory of Iran is located in the regions dominated by the arid, semiarid and sub-humid climatic types with low rainfall rates or none at all. Subsequently, the study of the Iranian water resources, especially in the areas that face the challenge of water scarcity, is crucial. The present study focuses on defining the condition and the quality of ground and surface drinking waters in the Delichai river-basin in Iran using GIS technologies and the Schoeller method, based on the semi-log scheme of the main ions concentration (HCO3–, SO4–, Cl–, Ca2+, Na+, Mg2+, mg/l). The quality of the ground drinking water in the areas concerned was detected on the basis of the data for 12 karises, 269 springs and 123 wells for the years 1984 – 2014. The main ions concentration in the ground and surface waters throughout the period proves the average quality (point of moderate danger) of the ground drinking water for all sub-basins: the excess content of Mg2+ – 82.66 mg/l (Iranian Standard, 30 mg/l), SO4– – 370.33 mg/l (Iranian Standard, 250 mg/l) Cl– – 366.33 mg/l (Iranian Standard, 250 mg/l), TDS 1582 mg/l (Iranian Standard, 1000 mg/l), TH 272 mg/l (Iranian
Standard, 200 mg/l). The same for the surface drinking water: the excess content of Mg2+ – 52 mg/l (Iranian Standard, 30 mg/l) SO4– – 301 mg/l (Iranian Standard, 250 mg/l), TDS 1200 mg/l (Iranian Standard 1000 mg/l), TH 207 mg/l (Iranian Standard, 200 mg/l). Consequently, the surface and ground waters in the Delichai river-basin are in a moderately dangerous condition.
|City||Moscow, Saint Petersburg|
|Key words||ground and surface waters, the Delichai riverbasin, GIS, Iran|