Application GIS Software to Determine the Distribution of T.D.S. Concentrations Along the Tigris River

Tigris River is a major source to supply water for big part of Iraq. Lately, Iraq has experienced shortage problems such as variability in climate and the building huge dams upstream countries (Turkey Iran). In this work, total dissolved salts (T.D.S.) were measured at fourteen sites on two periods year 2014. The first period consisted six rainy-months (April–September) second covered non-rainy-months (October-March). Interpolation technique inverse-distance-weighting (I.D.W.) ArcGIS was applied create prediction maps river concentration both periods. findings revealed that levels continued last site Al-Qurnah-city (Basrah) from Fish-Khabur-city (S-1). period, selected over period. According World-Health-Organization (2003), 2014 graded into five classes, then, classifications created.