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The overall GALDIT index has been calculated using Equation (1). It has been used to classify the study area according to its vulnerability to seawater intrusion. The computed GALDIT index of the studied groundwater samples has values in the range 2.5–7.5 (Figure 9). Based on Table 6, about 71% of the study area is of low seawater intrusion vulnerability and about 29% is of medium seawater vulnerability as a result of marine water associating Sabkha.

Table 6

Rating and weighting values of different hydrogeological parameters according to their relative importance

GALDIT index rangeVulnerability classes
>7.5 High vulnerability 
5–7.5 Moderate vulnerability 
<5 Low vulnerability 
GALDIT index rangeVulnerability classes
>7.5 High vulnerability 
5–7.5 Moderate vulnerability 
<5 Low vulnerability 

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