Table 2.

Climatic condition classification based on (a) the Standardized Precipitation Evapotranspiration Index (SPEI) proposed by Nam et al. [53] and (b) the Standardized Terrestrial Water Storage Index (STI) developed by Cui et al. [22].

(a) SPEI		(b) STI
Climatic condition	SPEI value	Climatic condition	STI value
Extreme/severe wet	≥1.50	Extreme wet	≥ 2.0
Moderate wet	1.00 to ≤ 1.49	Severe wet	1.5 ~ 2.0
Slight wet	0.50 to ≤ 0.99	Moderate wet	1.0 ~ 1.5
Normal	-0.49 to ≤ 0.49	Slight wet	0.5 ~ 1.0
Mild dry	-0.99 to ≤ - 0.50	Near Normal	−0.5 ~ 0.5
Moderate dry	-1.49 to ≤ -1.00	Slight Dry	−1.0 ~ -0.5
Extreme/severe dry	≤ - 1.50	Moderate dry	−1.5 ~ -1.0
		Severe dry	−2.0 ~ -1.5
		Extreme dry	≤−2