Journal of Babylon University/Engineering Sciences/ No.(1)/ Vol.(24): 2016 266 Assessment of the Irrigation Water Quality for Al- Kifl River in Al-Hindya City Layla Ali Mohammed Saleh Department of Civil Engineering, University of Karbala, Iraq. Lazu200919 @yahool.com Abstract The present study is an attempt to assessment the water quality of Al-Kifl river within Al- Hindiya city in Iraq for irrigation purpose. The total length of study reach was about 9 km, water samples were collected from three stations along the reach through two seasons, wet (January- February-March), and dry (July- August) during year 2015. The samples were test for EC, TDS, PH, Na + , Ca +2 , Mg +2 , HCO 3 - , SO 4 and Cl - parameters. According to irrigation water quality guidelines of Food and Agriculture Organization (FAO), the salinity, specific ion toxicity and miscellaneous effects problems were under the categories "slight to moderate" hazard for both seasons, While there was no infiltration hazard. Also, pH value and sulphate concentration were within accepted rang. The model of irrigation water quality index (IWQI) which developed in Brazil by Meireles et al. (2010) was used to evaluate the river water for irrigation, and values were found within the range (70-85) which classified as low restriction limit. Water in this category should be used in the light texture or moderate permeability soils and sodicity problem can appear in heavy texture soils. Key words: Al-Kifl river, Irrigation water quality Index, FAO. ﺍﻟﺨﻼﺼﺔ: ﺍﻟﺩﺭﺍﺴﺔ ﺍﻟﺤﺎﻟﻴﺔ ﻫﻲ ﻤﺤﺎﻭﻟﺔ ﻟﺘ ﻘﻴﻴﻡ ﻨﻭﻋﻴﺔ ﻤﻴﺎﻩ ﻨﻬﺭ ﺍﻟﻜﻔل ﻹﻏﺭﺍﺽ ﺍﻟﺭﻱ ﻀﻤﻥ ﻗﻀﺎﺀ ﺍﻟﻬﻨﺩﻴﺔ ﻓﻲ ﺍﻟﻌﺭﺍﻕ. ﺍﻟﻁﻭل ﺍﻟﻜﻠﻲ ﻟﻤﻨﻁﻘﺔ ﺍﻟﺩﺭﺍﺴﺔ9 ﻜﻡ، ﻨﻤﺎﺫﺝ ﺍﻟﻤﻴﺎﻩ ﺃﺨﺫﺕ ﻤﻥ ﺜﻼﺙ ﻤﺤﻁﺎﺕ ﻋﻠﻰ ﺍﻟﻨﻬﺭ ﻭﺨﻼل ﻤﻭﺴﻤﻴﻥ، ﺭﻁﺏ) ﻜﺎﻨﻭﻥ ﺍﻟﺜﺎﻨﻲ، ﺸﺒﺎﻁ، ﺁﺫﺍﺭ( ﻭﻤﻭﺴﻡ ﺠﺎﻑ) ﺘﻤﻭﺯ، ﺁﺏ( ﻟﺴﻨﺔ2015 . ﺘﻡ ﺘﺤﻠﻴل ﺍﻟﻌﻴﻨﺎﺕ ﻤﻥ ﺤﻴﺙ ﺍﻻﻴﺼﺎﻟﻴﺔ ﺍﻟﻜﻬﺭﺒﺎﺌ ﻴﺔ، ﺍﻷﻤﻼﺡ ﺍﻟﺫﺍﺌﺒﺔ ﺍﻟﻜﻠﻴﺔ، ﺍﻟﺭﻗﻡ ﺍﻟﻬﻴﺩﺭﻭﺠﻴﻨﻲ، ﺍﻟﺼﻭﺩﻴﻭﻡ، ﺍﻟﻜﺎﻟﺴﻴﻭﻡ، ﺍﻟﻤﻐﻨﻴ ﺴﻴﻭﻡ، ﺍﻟﻜﺎﺭﺒﻭﻨﺎﺕ، ﺍﻟﻜﺒﺭﻴﺘﺎﺕ ﻭﺍﻟﻜﻠﻭﺭﺍﻴﺩ. ﻁﺒﻘﺎ ﻟﺘﻌﻠﻴﻤﺎﺕ ﻤﻨﻅﻤﺔ ﺍﻟﻐﺫﺍﺀ ﻭﺍﻟﺯﺭﺍﻋﺔFAO ﺍﻟﻤﺘﻌﻠﻘﺔ ﺒﻨﻭﻋ ﻴﺔ ﻤﻴﺎﻩ ﺍﻟﺭﻱ، ﻓﺎﻥ ﻤﺸﻜﻠﺔ ﺍﻟﻤﻠﻭﺤﺔ، ﺍﻟﺴﻤﻴﺔ، ﻭﺍﻟﺘﺄﺜﻴﺭﺍﺕ ﺍﻷﺨﺭﻯ ﻓﻲ ﻤﻴﺎﻩ ﻨﻬﺭ ﺍﻟﻜﻔل ﻟﻜﻼ ﺍﻟﻤﻭﺴﻤﻴ ﻥ ﻜﺎﻨﺕ ﺘﻘﻊ ﻀﻤﻥ ﺨﻔﻴﻑ ﺍﻟﻰ ﻤﻌﺘﺩل ﺒﻴﻨﻤﺎ ﻻ ﺘﻭﺠﺩ ﻤﺸﻜﻠﺔ ﺒﺎﻟﻨﺴﺒﺔ ﻟﻨﻔﺎﺫﻴﺔ ﻤﻴﺎﻩ ﺍﻟﺭﻱ. ﺍﻴﻀﺎ ﻜﺎﻨﺕ ﻗﻴﻡ ﺍﻟﺭﻗﻡ ﺍﻟﻬﻴﺩﺭﻭﺠﻴﻨﻲ ﻭﺘﺭﻜﻴﺯ ﺍﻟﻜﺒﺭﻴﺘﺎﺕ ﻀﻤﻥ ﺍﻟﺤﺩ ﺍﻟﻤﻘﺒﻭل ﻓﻲ ﻤﻴﺎﻩ ﺍﻟﺭﻱ. ﺘﻡ ﺍﺴﺘﺨﺩﺍﻡ ﻤﺅﺸﺭ ﻨﻭﻋﻴﺔ ﻤﻴﺎﻩ ﺍﻟﺭﻱIWQI ﺍﻟﺫﻱ ﻁﻭﺭ ﻓﻲ ﺍﻟﺒﺭﺍﺯﻴل ﻤﻥ ﻗﺒلMeireles ﻭﺍﺨﺭﻴﻥ ﻋﺎﻡ2010 ﻟﺘﻘﻴﻴﻡ ﺼ ﻼﺤﻴﺔ ﻤﻴﺎﻩ ﻨﻬﺭ ﺍﻟﻜﻔل ﻟﻠﺭﻱ ﻭﻗﺩ ﺘﺭﺍﻭﺤﺕ ﻗﻴﻤﺘﻪ ﻀﻤﻥ ﺍﻟﻤﺩﻯ) 70 - 85 ( ﻭﺍﻟﺘﻲ ﺘﺼﻨﻑ) ﺘﻘﻴﻴﺩ ﻤﻨﺨﻔﺽ.( ﺍﻟﻤﻴﺎﻩ ﻀﻤﻥ ﻫﺫﺍ ﺍﻟﺼﻨﻑ ﻴﺠﺏ ﺍﻥ ﺘﺴﺘﺨﺩﻡ ﻟﺭﻱ ﺍﻟﺘﺭﺏ ﺫﺍﺕ ﺍﻟﻨﺴﺠﺔ ﺍﻟﺨﻔﻴﻔﺔ ﺍﻭ ﺍﻟﻨﻔﺎﺫﻴﺔ ﺍﻟﻤﻌﺘﺩﻟﺔ ﺤﻴﺙ ﻤﻤﻜﻥ ﺍﻥ ﺘﻅﻬﺭ ﻤﺸﻜﻠﺔ ﺍﻟﺼﻭﺩﻴﺔ ﻓﻲ ﺍﻟﺘﺭﺏ ﺍﻟﺜﻘﻴﻠﺔ ﺍﻟﻨﺴﺠﺔ. اﻟﻜﻠﻤﺎت اﻟﻤﻔﺘﺎﺣﯿﺔ: ﻧﮭﺮ اﻟﻜﻔﻞ، ﻣﺆﺷﺮ ﻧﻮﻋﯿﺔ ﻣﯿﺎه اﻟﺮي، اﻟﻐﺬاء واﻟﺰراﻋﺔ 1. Introduction The quality of irrigation water has a significant effect on the soil salinity, growth and yield of agricultural crops. In general, water used for irrigation always contains different concentrations of dissolved salts which are generated naturally (precipitation rate, weathering of the rocks and dissolving of other salt sources) or anthropological i.e. domestic and industrial sources ( Jarvie et. al., 1998). The most important criterion that need to be considered when assessing the quality of irrigation water are (Ayres and Westcot, 1994): 1- Salinity: if the total concentration of salts dissolved (TDS) in irrigation water is high enough to accumulate in the root zone of crops, the crop will have the additional difficulty in extracting sufficient quantities of water from salty soil solution. Salinity can lead to slow growth,low yield, and early symptoms of wilt. Commonly, the electrical conductivity (EC) parameter can be used to explain the salinity of water. 2- Permeability:irrigation water quality has an effect on reducing the soil permeability. Low salts and the relative high content of sodium to calcium and magnesium in water can reduce the rate of infiltration through the soil. So, the crop is not a sufficient supplied with water and yield is reduced. The most common water quality parameter which influences the natural rate of water