The basic reason behind the need tomonitor water quality is to verify whether the examinedwater quality is suitable for intended usage or not. Thisstudy is conducted on Al -Shamiya al- sharqi drain inDiwaniya city in Iraq to make valid assessment for thelevel of parameters measured and to realize their effectson irrigation. In order to assess the drainage waterquality for irrigation purposes with a high accuracy, theIrrigation Water Quality Index (IWQI) will be examinedand upgraded (integrated with GIS) to make aclassification for drainage water. For this purpose, tensamples of drainage water were taken from different tenlocation of the stuay area. The collected samples wereanalyzed chemically for different elements which affectwater quality for irrigation.These elements are :Calcium(Ca+2), Sodium(Na+), Magnesium(Mg+2),Chloride( ), Potassium(K+), Bicarbonate(HCO3),Nitrate(NO3), Sulfate( , Phosphate( , ElectricalConductivity(EC), Total Dissolved Solids (TDS), TotalSuspended Solids (TSS) and pH-values (PH). SodiumAdsorption Ratio (SAR) and Sodium Content (Na%)have been also calculated. Results suggest that, the use ofGIS and Water Quality Index (WQI) methods couldprovide an extremely interesting as well as efficient toolto water resource management. The results analysis of(IWQI) maps confirms that: 52% of the drainage waterin study area falls within the "Low restriction" (LR) and47%of study area has water with (Moderaterestriction)(MR),While 1% of drainage water in thestudy area classified as (Sever restriction) (SR). So, thedrainage water should be used with the soil having highpermeability with some constraints imposed on types ofplant for specified tolerance of salts
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