China Runoff Coefficient
The runoff coefficient refers to the ratio of the runoff depth of a region to the amount of precipitation that forms the runoff in that period, which is between 0 and 1, and the unit is expressed as a decimal number. The runoff coefficient depends on the natural geographical conditions and has a certain regional distribution. China's annual runoff coefficient distribution roughly from the southeast half to the northwest half decline. The coefficient of runoff is relatively large in the humid area. The runoff coefficient in arid area is small, and in some areas it is near zero.
The annual runoff coefficient of the southeast of China is Nanyang Basin, Sichuan Basin and the central part of Yunnan, the largest in the mountainous region is 0.9 or above. The annual runoff coefficient is below 0.05 in the north part of the Northeast Plain, the central part of the North China Plain and the Northwest Arid Desert.
| River name | Total runoff | Statistical year |
| Yangtze | 9755 | 1942-1979 |
| Pearl River | 3360 | 1956-1979 |
| Brahmaputra | 1654 | 1956-1979 |
| Heilongjiang Province | 1166 | 1956-1979 |
| Lancang River | 740 | 1956-1979 |
| Songhua River | 718 | 1956-1979 |
| Nu River | 689 | 1956-1979 |
| Huaihe River | 622 | 1956-1979 |
| Yellow River | 592 | 1919-1979 |
| Haihe River | 228 | 1956-1979 |
river annual runoff coefficient and the average annual average runoff of major rivers
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