Quantification and characterization of hydrological drought in the Oued El-Abid watershed between 1978-2019: Statistical and GIS approachesElhoucein Layati, Abdelghani Qadem and Mohamed El GhachiE3S Web Conf., 337 (2022) 02004DOI: https://doi.org/10.1051/e3sconf/202233702004