This article aims at investigating the weather parameter trends impact on the production of drinking water and water balance in the state of Constantine, Algeria. In this respect, statistical criteria (the Mann-Kendall trend test, linear regression model and deviations from the average) were used to show the close relationship between the general trend and the variability of the annual mean temperature and rainfall during the period from 1976 to 2020, as well as the variability in the waterbalance to determine the water gap for the period 2007-2019. The results from the Mann-Kendall test shows that the annual trends of the minimum, maximum and normal temperature are increasing after showing positive Mann-Kendall Z-values (0,41; 5,29 and 3,74) respectively. However, the annual rainfall trend was observed to be decreasing after having a negative Z-value (-1,36). Therefore, the estimation parameters of linear regression correlate with the study results. However, an examination of the12- year (2007-2019) water balance revealed it is evident that water production is not significantly affected by the general trends of temperature and rainfall. Additionally, the distribution of drinking water reveals an inequality, and real needs of drinking water in this state are not under control.

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