Dongting Lake also receives water from 4 main tributaries: Xiangjiang River, Zishui River, Yuanjiang River, and Lishui River. The average annual discharges of the Xiangjiang River and Yuanjiang River are 6.43 × 1010 m3 and 6.53 × 1010 m3, respectively, which contribute to around 77.52% of the total tributary inflow. There are 26 relatively large reservoirs in the Dongting Lake catchment (Figure 2). Of these, accounting for more than 90% of the total regulation capacity of tributaries' reservoirs (Table 1), 8 major reservoirs are selected:
(i) Dongjiang Reservoir and Taoshui Reservoir on Xiangjiang River;
(ii) Zhexi Reservoir on Zishui River;
(iii) Wuqiangxi Reservoir, Fengtan Reservoir, Tuokou Reservoir and Huangshi Reservoir on Yuanjiang River;
(iv) Jiangya Reservoir on Lishui River.
Figure 2
Map of Dongting Lake tributaries and location of tributary reservoirs.
Table 1
Characteristics of TGR and 8 major reservoirs on the 4 main tributaries of Dongting Lake
| Reservoir | Location (river) | Dead water level (m) | Normal water level (m) | Utilizable capacity (×109 m3) | Total storage capacity (×109 m3) | Storage period |
|---|---|---|---|---|---|---|
| TGR | Yangtze | 145.0 | 175.0 | 16.5 | 39.3 | September–October |
| Dongjiang | Xiangjiang | 242.0 | 285.0 | 5.25 | 9.15 | September–November |
| Taoshui | Xiangjiang | 170.0 | 205.0 | 0.39 | 0.52 | August–October |
| Zhexi | Zishui | 144.0 | 169.5 | 2.26 | 3.57 | August–October |
| Wuqiangxi | Yuanjiang | 90.0 | 108.0 | 2.02 | 4.29 | July–October |
| Fengtan | Yuanjiang | 170.0 | 205.0 | 1.06 | 1.73 | July–October |
| Tuokou | Yuanjiang | 235.0 | 250.0 | 0.62 | 1.25 | August–October |
| Huangshi | Yuanjiang | 77.0 | 90.0 | 0.34 | 0.60 | September–October |
| Jiangya | Lishui | 188.0 | 236.0 | 1.16 | 1.74 | July–October |
| Reservoir | Location (river) | Dead water level (m) | Normal water level (m) | Utilizable capacity (×109 m3) | Total storage capacity (×109 m3) | Storage period |
|---|---|---|---|---|---|---|
| TGR | Yangtze | 145.0 | 175.0 | 16.5 | 39.3 | September–October |
| Dongjiang | Xiangjiang | 242.0 | 285.0 | 5.25 | 9.15 | September–November |
| Taoshui | Xiangjiang | 170.0 | 205.0 | 0.39 | 0.52 | August–October |
| Zhexi | Zishui | 144.0 | 169.5 | 2.26 | 3.57 | August–October |
| Wuqiangxi | Yuanjiang | 90.0 | 108.0 | 2.02 | 4.29 | July–October |
| Fengtan | Yuanjiang | 170.0 | 205.0 | 1.06 | 1.73 | July–October |
| Tuokou | Yuanjiang | 235.0 | 250.0 | 0.62 | 1.25 | August–October |
| Huangshi | Yuanjiang | 77.0 | 90.0 | 0.34 | 0.60 | September–October |
| Jiangya | Lishui | 188.0 | 236.0 | 1.16 | 1.74 | July–October |