Isotopic Characterization of Rainwater for the Development of a Local Meteoric Water Line in an Arid Climate: The Case of the Wadi Ziz Watershed (South-Eastern Morocco)

For any hydrological or hydrogeological system, the arrival of new rains is input signal to system. This isotopic signature precipitation major interest in understanding recharge processes aquifer On scale a given basin, staged stations at different altitudes and spread out space allow this be well characterized draw local meteoric water line. In south-eastern Morocco, specifically, Errachidia region, several chemical studies waters various aquifers have been carried out. absence line, these were based on use global line (GMWL). Thus, objective work characterization elaboration rainwater Ziz watershed. study area 41 measurements stable isotopes (?18O ?2H) relating precipitations collected during period from December 2019 November 2020 four over upstream downstream The linear relationship ?2H as function ?18O describes (LMWL) by equation = 7.5 ± 0.3 + 4.6 1.7; R2 0.93. displays evaporation confirmed continental currents an arid environment. variation sampling for highlighted ?0.0026 ? Z ? 1.67, with 0.93, which means altitudinal gradient ?0.26‰ per 100 m altitude. regard, development determination first time semi-arid region watershed will great researchers resource managers; example, help determine groundwater areas, exchanges between surface groundwater, analyze many other problems.