The rainfall chronicles in the locality of Doba and its surroundings by the Standardized Rainfall Index (SPI) and Randomness Verification Tests

The study of the rainfall chronicles and its surroundings by standardized index (spi) randomness verification tests is great importance for management planning water resources. This work aims to variations regime over time determining precise years rupture in chronological series. considered data spread 4 decades (from 1980 inclusive 2019). These were used calculate Standard Pluviometric Precipitation Index (SPI). results show that indices vary from - 2.48 1.99 (extreme dry very wet). statistical methods Pettitt, Buishand, Bayesian Lee Heghinan two sequences. A rain deficit sequence 2002 with an average order (- 0.3113) intercalated severe droughts (1993, 1987, 1993, 2002). surplus 2003 2019 0.42. observed have had a significant impact on incoming flows.