Evaluating the Quality of Groundwater and its Suitability for Irrigation in Misan Governorate Southern Iraq

الملخص

      This study was conducted to evaluate the quality of groundwater in Misan governorate by selecting 15 distributed wells in different areas (Ali Al-Gharbi, Ali Al-Sharqi, Al-Tayeb, Al-Musharrah, Governorate center, Al-Battira, Al-Maymouna and Al-Uzair). The physical and chemical properties of water samples were estimated, such as (pH, EC, T.H, Calcium, magnesium, sodium, potassium, chloride, sulfate, and bicarbonate). The results were showed variations in the concentrations of ions depending on their locations. Some evidences were used to evaluate the quality of water for irrigation, and it was found that 73.33% of the water samples are within the C₄S₁ class, which is very high in salinity and not suitable for irrigation according to the SAR standard. The values of % Na were ranged between (26.22-71.04) % and that 33.33% of the water samples were good and suitable for irrigation according to this standard, while 26.66% of the water samples are suitable for irrigation according to the P.S standard. As for the RSC and PI evidences, all water samples are suitable for irrigation. When using the Kelly index, it was found that all water samples are suitable for irrigation except for sites 7 and 14 (Al-Musharrah and Al-Uzair), in addition, 60% of the water samples are suitable for irrigation according to the MAR standard.