Table 7: Simulated runoff yielded by similar amount of precipitations in the three sub-basins.

SubbasinsYearPrecipitation (mm) Simulated runoff (108 m3)
AnnualFlood season Percentage of flood season (%)

Shuntian 200412741108.1086.577.56
199912791107.5087.008.41
200214211079.6176.008.12
200314251256.1688.179.80
1985*16391217.4074.2711.83
1987*16431185.5772.1413.15
198218111396.4377.1113.04
198418131592.1787.8314.70

Lantang 198616281259.6077.397.96
199816311148.1070.398.77

Jiuzhou 198117541427.0081.354.00
198217521398.1079.793.48
198415771498.5095.023.87
198915751316.7083.613.51

Annual precipitation for Yuecheng subbasin varies greatly all the years as compared with other sub-basins, and no similar amount of precipitations can be found in different years. The impact of inner-annual distribution of precipitation on the variation of runoff in Yuecheng subbasin was neglected.