Detecting Runoff Variation of the Mainstream in Weihe River

Table 5

Changes in mean precipitation (mm) and runoff (10⁸ m³) in the five periods from 1956 to 2011.

Period	Mean precipitation	Mean change	Percent change	Mean runoff /(10^8 m³/s)	Mean change	Percent change	Specific value/10^8 m³	Rate changes
1956–1969	594.48			93.95
1970–1979	553.8	−40.67	−6.80%	59.41	−40.67	−43.30%	6.33
1980–1989	576.09	−18.39	−3.10%	79.15	−14.8	−15.80%	5.09	0.19
1990–1999	509.46	−85.02	−14.30%	43.73	−50.22	−53.50%	3.74	0.41
2000–2011	530.83	−63.65	−10.70%	49.23	−44.72	−47.60%	4.45	0.3