Abstract
The present study deals with the hydrochemical characteristics of groundwater in the upper catchment of Wadi Fatimah basin. The analysis of data indicated strongly that the chloride and sulfate in the groundwater are mainly of marine origin, concentrated by high evaporation processes. Flushing is the most important factor that modifies the ionic concentrations and almost stands for the short-term variation in groundwater chemistry. Weathering reactions of the rock-forming minerals take place under relatively high PCO2 condition in water and soil zone; it can be an important long-term neutralization process. It is accounted as a contributor for Ca and Mg ions in the groundwater. Using the chloride method the recharge rate has been estimated at 72 mm yr−1.
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