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Table 7 Regional intensity, duration and frequency of drought events identified from SPI values at a 12-month scale for different periods in GWB

From: Spatial and temporal appraisal of drought jeopardy over the Gangetic West Bengal, eastern India

Drought Indicators Phase-I: 1901–1933 Phase-II: 1934–1964 Phase-III: 1965–2002 1901–2002
Average Drought Intensity (MID) −0.71 − 0.82 − 0.77 −0.77
Maximum Drought Intensity (PID) -1.98, 1903, July -2.83, 1939, June -2.82, 1967, June − 2.83, 1939, June
Average Drought Duration (DDA(M)) (SPI: ≤ − 1.0 for consecutive months) 2.61 5.54 4.39 4.18 month
Maximum Drought Duration (DDL(M)) (SPI: ≤ − 1.0 for consecutive months) 10 month (August, 1927 to May, 1928) 21 month (Sept, 1957 to May, 1959) 14 month (July, 1966 to August, 1967) 21 month (Sept, 1957 to May, 1959)
Most Intense Duration (DDI(M)) (SPI: ≤ − 2.0 for consecutive months) 8 month (July, 1903 to Feb, 1904). Mean Intensity: -1.46 11 month (Sept, 1938 to July, 1939). Mean Intensity: -1.68 7 month (Sept, 1966 to March, 1967). Mean Intensity: -2.06 7 month (Sept, 1966 o March, 1967): Mean Intensity: − 2.06
Moderate Drought Frequency (%) 10.65 10.65 12.73 10.80
Severe Drought Frequency (%) 2.69 6.72 4.30 4.20
Extreme Drought Frequency (%) 0 1.32 1.97 1.24