Fig. 4: Annual sedimentation and erosion in the Sanmenxia Reservoir and Xiaolangdi Reservoir.

Because the Sanmenxia and Xiaolangdi reservoirs began operation in 1960 and 1999, respectively, sedimentation and erosion are shown for only Sanmenxia Reservoir prior to 1999, whereas sedimentation and erosion are shown for both Sanmenxia and Xiaolangdi reservoirs since 1999.