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Table 2 List of selected parameters and their modes of ranking of the parameters for CDRI

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

Sl no. Parameters Sensitivity/logical consideration Relation to drought Mode of ranking
1 Average rainfall More the rainfall less the risk Indirect highest rank (i.e. 1) to lowest rainfall station
2 Rainfall trend decreasing trend will indicate intensification of dry condition and vice versa Indirect highest rank (i.e. 1) to lowest trend value arranged from lowest (extreme −ve) to highest (extreme +ve)
3 Mean drought intensity More the intensity (SPI ≤1.0) more the risk Direct highest rank (i.e. 1) to highest drought intensity (extreme -ve SPI)
4 Average drought duration More duration means more risk Direct highest rank (i.e. 1) to highest drought duration
5 Severe drought frequency (%) More frequency means more risk Direct highest rank (i.e. 1) to highest drought frequency
6 Extreme drought frequency (%) More frequency means more risk Direct highest rank (i.e. 1) to highest drought frequency
7 Trend of drought intensity +ve trend will indicate intensification of wet condition and negative trend will indicate intensification of dry condition. Indirect highest rank (i.e. 1) to lowest trend (i.e. z) value arranged from lowest (extreme −ve) to highest (extreme +ve)
8 Recurrence interval of severe drought More the recurrence interval less the risk Indirect highest rank (i.e. 1) to lowest return period
9 Recurrence interval of extreme drought More the recurrence interval less the risk Indirect highest rank (i.e. 1) to lowest return period
10 Threshold rainfall More the rainfall requirement more the chances of drought Direct Highest rank (i.e. 1) to highest critical rainfall amount.