There was an error in the original publication. The well number of referenced freshwater quality shown for the Nile Delta in Table 2 [1] was “19” and not “10” from reference [50]. Since the water quality data were correctly shown in Table 2 from well number 19, it had no influence on the correctness of the results. In Equation (7), there was a typing error in the presentation of the equation. The correct equation is (Formula presented.). The results of the paper are based on the correct equation. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.