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Drought intensity classification in various categories with different values of SPI is given in Table 1. Positive SPI values indicate greater than median precipitation, and negative values indicate less than median precipitation. In this study, the SPI program developed by the author (Khadr 2011) is used to compute the time series of drought indices (SPI) for each station in the basin and for each month of the year at different timescales (3, 6, 9, 12 and 24 months).

Table 1

Weather classification based on the SPI

SPIClassification
>2 Extremely wet 
1.5 to 1.99 Very wet 
1 to 1.49 Moderately wet 
0.99 to –0.99 Near normal 
–1 to –1.49 Moderately dry 
1.5 to –1.99 Severely dry 
–2 and less Extremely dry 
SPIClassification
>2 Extremely wet 
1.5 to 1.99 Very wet 
1 to 1.49 Moderately wet 
0.99 to –0.99 Near normal 
–1 to –1.49 Moderately dry 
1.5 to –1.99 Severely dry 
–2 and less Extremely dry 

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