Risk Assessment of Drought in the Yangtze River Delta Based on Natural Disaster Risk Theory

Table 1

Drought rank of MDCI.

Rank	Drought grade	MDCI
1	Normal or wet	−0.6 < MDCI
2	Light drought	−1.2 < MDCI ⩽ −0.6
3	Medium drought	−1.8 < MDCI ⩽ −1.2
4	Drought	−2.4 < MDCI ⩽ −1.8
5	Severe drought	MDCI ⩽ −2.4