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Table 5 Results of Silt Reduction Calculations for Cuntan Hydrometric Station due to Silt-holding by Upstream Reservoirs

Catchment Reservoir size Annual sedimentation of reservoir aggregations (104tons) Distance between gravity center of reservoir aggregation and outlet station in catchment (km) Distance between catchments outlet station and Cuntan station (km) Sedimentation impact coefficient for Cuntan station (%) Silt reduction due to reservoir silt-holding for Cuntan station (104tons)
Jialing River Large-sized 1985 790 67 9.69 192
Medium and small-sized 1974 234~450 67 41~23.4 809~462
Tuojiang River Large to small-sized 856 500 354 14.9 128
Minjiang River Large to small-sized 2175 280 418 21.1 459
Jinsha River Large to small-sized 1465 810 444 6.2 91
Upper Yantze Medium and small-sized 494 300~350 41.1~36.1 203~178
Total 8949 21~16.9 1882~1510