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 |