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. |