The floods in the Haerbin station of Songhua River are mainly composed by the Neng River, the second Songhua River and Lalin River. The big floods in the history of Haerbin are the consequence of the meet of the three rivers.
People always say the flood in Habin is on the basis of the enough water in Neng River combined with the large flood peak. The bad combination of the three rivers always leads to the large flood or catastrophic flood in Habin. The data of recent 30 years shows that the combination of the three rivers or only the water from the stream of Songhua River can form the large flood in Habin, such as the catastrophic floods in 1969 and 1998.
Below is the table of 8 large floods'quantity of flow at peak and for 60 days which quantity of flow at peak overded 8000 cubic meters per second in Harbin after the founding of the people's Republic of China.
Table.1 The quantity of flow at peaks of the large flood in Haerbin station
| Year | The main stream of the Songhua River | Nenjiang River | The second Songhua River | Lalin River | ||||
|---|---|---|---|---|---|---|---|---|
| Ha'erbin | Dalai | Fuyu | Caijiagou | |||||
| The quantity at the peak | % | The quantity at the peak | % | The quantity at the peak | % | The quantity at the peak | % | |
| 1953 | 9530 (11700) |
100 | 3860 | 42.9 | 5010 | 55.7 | 130 | 1.4 |
| 1956 | 11700 (12200) |
100 | 5210 | 44.9 | 3940 | 34.0 | 2450 | 21.1 |
| 1957 | 12200 (14300) |
100 | 7150 | 54.2 | 5150 | 39.0 | 903 | 6.8 |
| 1960 | 9100 (10000) |
100 | 4120 | 45.1 | 3100 | 33.9 | 1920 | 21.0 |
| 1969 | 8500 (8730) |
100 | 7110 | 87.3 | 880 | 10.8 | 150 | 1.9 |
| 1986 | 8540 (10000) |
100 | 3690 | 32.3 | 7170 | 63.0 | 576 | 4.7 |
| 1991 | 10700 (135000) |
100 | 6370 | 41.1 | 7600 | 49.0 | 1480 | 9.9 |
| 1998 | 21300 (23500) |
100 | 22100 | 86.4 | 3230 | 12.6 | 263 | 1.00 |
| Catchment area(million km2) | 3.898 | 10 | 2.217 | 5.69 | 0.718 | 1.84 | 0.183 | 0.47 |
Note: The quantity of flow at the peak of floods in the () are the results from the Fengman reservoirs.
The information is provided by Disaster Risk Reduction Knowledge Service.
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