Abstract
During the last century, Algeria experienced a rainfall deficit were recorded in 1944, then successive drought periods since 1975 to the present day in Northen and Eastern. The most recent has repercussions on water resources and on agriculture. In this paper, we focus on the meteorological and hydrological drought. For describing and monitoring drought severity periods, we used meteorological and hydrological drought indices: Standardized Precipitation Index (SPI) and effective Drought Index (EDI) and the standardized Runoff Index (SRI). Data were recording for the period of 30 years at wadi Louza, a small catchment of wadi El Hammam basin (NW- Algeria). The best correlation between meteorological drought indices was found for 9-month time step. The results demonstrate that the watershed of Wadi Louza has experienced a severe meteorological drought and extreme hydrological drought
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