Assessment of Groundwater Quality for Irrigation Purposes in Sidi Slimane, Morocco Using the Irrigation Water Quality Index doi.org/10.26538/tjnpr/v6i4.9
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Abstract
Groundwater pollution is a major problem in most countries, including Morocco. This study was aimed at evaluating the suitability of groundwater for irrigation in Sidi Slimane, Morocco, using the irrigation water quality index (IWQI). Water samples were collected from 20 wells in 2018. Electrical conductivity (EC), sodium adsorption rate (SAR), sodium ions (Na+ ), chloride ions (Cl- ), and bicarbonate ions (HCO3- ) were measured, and the parameter values were used to compute and plot the irrigation water quality index (IWQI). The results showed that the average values for EC and SAR of the groundwater samples were 4915±3772 μS/cm and 11.22 ±5.36, respectively. Water toxicity was calculated in terms of sodium ion concentration (Na+ ), yielding a mean value of 32.09±22.03 meq/L. Furthermore, the average chloride and bicarbonate ion concentrations in the study area were 31.31±22.86 meq/L and 7.568±2.599 meq/L, respectively. The IWQI map revealed that more than 65% of the water samples were in the excellent category, which is dominant in the large areas in the west; 35% of the water samples were in the good category in the center of the study area, and 5% of the water samples were in the poor category in the east of the study area. The findings of this study should be taken into account for the management of groundwater for irrigation in the Sidi Slimane region of Morocco.
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