Irrigation Water Quality Assessment of Al-Kahla'a District near Amara city in Maysan Governorate
Al-Ma'ail River extends for about 47 km, and it is one of the Iraqi small rivers. Its importance is due to the dependence of villagers in Al-Kahla’a District, Maysan Governorate, on the Maail River water for daily purposes, including irrigation and livestock drinking. The Ma`il River extends next to Halfayaoil field, ending with the Umm Al-Na’aj Pond and Al-HawizehMarsh, which is considered one of the largest Iraqi marshes located in the governorates of Maysan and Basra on the border between Iraq and Iran, where 79% of Al-HawizehMarsh in Iraq and 21% of it within the Iranian borders, the environmental quality of Al-Ma'ail River is under great pressure from a variety of human activities. Where water is commonly used as an indicator of contamination by metals, the irrigation water was classified within the Al-Kahla'a District according to the most common irrigation water classification systems, which is the International Food and Agriculture Organization (FAO) system, and since then evaluating its suitability for irrigation purposes. This study showed that all the studied irrigation water models fall within the class S1 according to the Wilcox classification. As for the FAO system, the studied irrigation water models fall within the category (increase in the risk of salinity) in relation to the salinity index, and within two categories (no problem and increase in the problem) in relation to for soil permeability index based on SAR and EC indicators, and within my category (no problem and more problem). The pH values of these waters were also within normal limits. It was noted that the high content of this water of calcium and magnesium ions compared to sodium ions reduces the risk of residual bicarbonate RSC and low values of ESP for the soil.
Keywords- Irrigation, Water Quality, Exchanging Sodium Percentage, Al-Ma’ail River,Al-Hawizeh Marsh.