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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:
Figure 2

Map of Dongting Lake tributaries and location of tributary reservoirs.

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

ReservoirLocation (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 
ReservoirLocation (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 
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