Jiangqiao Station is in the lower reaches of Nenjiang and its water control area is 162,000 square kilometers which is accounting for 54.7% in total water basin of Nenjiang. Main streams such as Yalu River and Chuor River between Jiangqiao Bridge and Fularji flowed into Nenjiang River.
Among the eight great floods whose peak discharge were more than 6000 cubic meters a second, five times had their over 60% water source from the trunk stream Fularji River, and their composition of flood volume were similar to the flood peak condition. However, they were typical interval floods in 1957 and 1983. Especially, the two main right-side tributaries which are Yalu River and Chuoer River took a great percentage. The flood in 1998 belonged to the basin-wide type. Its water source were both great from the Fularji River and the right-side tributary in the interval.
Table.1 The composition of annual flood peaks in Jiangqiao unit:(m3 /s)
| Year | Main stream of Nenjiang | Yalu River | Chuor River | Handahan River | Main stream of Nenjiang | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Fularji | Mount Nianzi | Liangjiazi | Jingxing | Jiangqiao | ||||||
| Qm | % | Qm | % | Qm | % | Qm | % | Qm | % | |
| 1956 | 5100 | 69.5 | 1210 | 16.5 | 1030 | 14.0 | 6950 | 100 | ||
| 1957 | 2180 | 25.6 | 2570 | 30.2 | 3260 | 38.2 | 514 | 6.0 | 6300 | 100 |
| 1969 | 10000 | 84.7 | 691 | 5.85 | 852 | 7.21 | 266 | 2.24 | 10600 | 100 |
| 1988 | 8450 | 93.8 | 174 | 1.93 | 282 | 3.13 | 104 | 1.14 | 6620 | 100 |
| 1989 | 6610 | 88.6 | 265 | 3.55 | 549 | 7.36 | 32.4 | 0.49 | 6900 | 100 |
| 1991 | 4860 | 64.7 | 1280 | 17.0 | 930 | 12.4 | 447 | 5.9 | 7080 | 100 |
| 1993 | 2860 | 35.8 | 2150 | 26.9 | 2010 | 25.1 | 980 | 12.2 | 7120 | 100 |
| 1998 | 15500 | 54.7 | 6840 | 24.1 | 3630 | 12.0 | 2400 | 8.57 | 26400 | 100 |
| Catchment area (million km2) | 1.239 | 7.62 | 0.136 | 0.84 | 0.155 | 0.95 | 0.041 | 0.25 | 1.626 | 10 |
Table.2 The composition of 30 days'flood volume in Jiangqiao Station unit:(lO8m3)
| Year | Main stream of Nenjiang | Yalu River | Chuor River | Handahan River | Main stream of Nenjiang | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Fularji | Mount Nianzi | Liangjiazi | Jingxing | Jiangqiao | ||||||
| W30 | % | W30 | % | W30 | % | W30 | % | W30 | % | |
| 1956 | 76.8 | 74.3 | 13.7 | 13.3 | 12.8 | 12.4 | 108 | 100 | ||
| 1957 | 84.0 | 57.3 | 25.4 | 17.3 | 30.5 | 20.8 | 6.81 | 4.6 | 142 | 100 |
| 1969 | 147 | 85.9 | 9.84 | 5.75 | 11.7 | 6.83 | 2.65 | 1.52 | 163 | 100 |
| 1988 | 108 | 85.1 | 6.92 | 5.45 | 9.84 | 7.75 | 2.19 | 1.70 | 127 | 100 |
| 1989 | 97.4 | 86.5 | 7.94 | 7.05 | 6.54 | 5.81 | 0.71 | 0.64 | 106 | 100 |
| 1991 | 101 | 73.5 | 19.0 | 13.8 | 12.8 | 9.32 | 4.55 | 3.38 | 139 | 100 |
| 1993 | 62.8 | 55.7 | 24.2 | 21.5 | 19.5 | 17.3 | 6.25 | 5.50 | 118 | 100 |
| 1998 | 200 | 63.6 | 51.6 | 16.4 | 51.8 | 16.5 | 11.2 | 3.50 | 348 | 100 |
| Catchment area (million km2) | 1.239 | 7.62 | 0.136 | 0.84 | 0.155 | 0.95 | 0.041 | 0.25 | 1.626 | 10 |
The information is provided from Disaster Risk Reduction Knowledge Service.
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