Detecting Runoff Variation of the Mainstream in Weihe River

Table 6

Changes in mean precipitation (mm) and runoff (10⁸ m³) from 1956–1989 to 1990–2011.

Period	Mean precipitation	Mean change	Percent change	Mean runoff	Specific value /10^8 m³	Rate of migration
1956–1989	506.02			69.04
1990–2011	521.11	15.10	3.0%	46.73	−22.31	−32.3%