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

Table 3

Classification criteria for buffer widths and their susceptible index in different waters.

Type of water	Buffer width (km)/impact index
	First level buffer	Second level buffer
0.1–1 km^2 reservoir/lake	0.5/0.3	1/0.1
1–10 km^2 reservoir/lake	2/0.35	4/0.15
10–100 km^2 reservoir/lake	3/0.4	6/0.2
>100 km^2 reservoir/lake	5/0.45	9/0.25
First level river	4/0.45	8/0.25
Second level river	3/0.35	6/0.15