Dams and Impounded Rivers - River Dynamics and Integrated River Management - page 444

January 2007 to January 2008 the pool level was controlled at around 156 m in non-flood season, and
was drawn to 145 m from June to October, so high sediment concentration flood water flowed through
the reservoir and released to the downstream reaches. Figure 7.41 shows the distributions of monthly
runoff and sediment load at the Cuntan and Yichang stations in 2007, which represent water and load
inflowing and out of the reservoir, respectively (MWR, 2008). The result shows that more than 30% of
the incoming sediment load is discharged out of the reservoir during the flood season.
Fig. 7.40 Accumulated sedimentation of the Three Gorges Project reservoir for the three scenarios: Scheme 1 = without
upstream reservoirs; Scheme 2 = with the Xiangjiaba Reservoir; and Scheme 3 = with the Xiluodu Reservoir
Fig. 7.41 Distributions of monthly runoff and sediment load at the Cuntan and Yichang stations, which represent water
and sediment load flowing in and out of the reservoir, respectively (MWR, 2008)
Figure 7.42 (a)-(c) shows the measured cross sections in the reservoir in 2003, 2005, 2006 and 2007 at
5.6 km, 160 km and 356 km from the dam, respectively (MWR, 2007, 2008). Sediment accumulated in