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Table 5

Classification of hydrological drought states, using the SDI index

StateDrought conditionRangePercentage of probability
No drought SDI ≥ 0 50 
Mild drought 0> SDI ≥ −1 34.1 
Moderate drought −1 > SDI ≥− 1.5 9.2 
Severe drought −1.5> SDI ≥− 2 4.4 
Extreme drought SDI < −2 3.3 
StateDrought conditionRangePercentage of probability
No drought SDI ≥ 0 50 
Mild drought 0> SDI ≥ −1 34.1 
Moderate drought −1 > SDI ≥− 1.5 9.2 
Severe drought −1.5> SDI ≥− 2 4.4 
Extreme drought SDI < −2 3.3 
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