Table 1. Variations of annual streamflow and precipitation in Liudong River watershed.

	1968–1980 (period I)				1981–2006 (period II)				2007–2013 (period III)
	Mean	Standard Deviation	Cv	Ratio of Cv	Mean	Standard Deviation	Cv	Ratio of Cv	Mean	Standard Deviation	Cv	Ratio of Cv
Runoff (m3/s)	376.56	92.04	0.24	2.00	327.16	82.57	0.25	1.67	328.33	52.87	0.16	0.73
Precipitation(mm)	1288.02	152.28	0.12		1115.82	165.33	0.15		1096.67	236.53	0.22