Table 2. Index classification of debris flow susceptibility.

Assessment index	The Vulnerability level
	I	II	III	IV
X1	≤10	10~30	30~60	≥60
X2	≤3	3~6	6~12	≥12
X3	≤15	15~25	25~32	≥32
X4	≤5	5~10	10~100	≥100
X5	≤100	100~300	300~500	≥500
X6	≥60	30~60	10~30	≤10
X7	≤25	25~50	50~100	≥100