根据苏联列寧格勒水电設計分院关于黄河三門峽水利樞紐水庫淤積的估計:由水庫上游泄入水庫的泥沙將有80％淤積于水庫之中,而只有20％很細的泥沙,將穿过水电站和水壩洩水道泄入黄河下游。黄河在三門峽每年平均下泄的泥量是13.6億噸,因此,每年將有11億噸的泥沙淤積在三门峽庫里,將有2.6億噸泄入下游。由于三門峡水庫上游黄土地区水土保持工作的推進,水庫淤積情况將顯著改变。列寧格勒設計分院經过審慎研究,計算到1967年入庫泥沙量比現有情况將減少20％,而到50年末期將减少50％。按列寧格勒設計分院的計算,水庫运用50年后的淤積量是336億公方,將近总庫容的一半。列寧格勒設計分院指出:由于水庫的淤積,当正常水位变小时水庫使用期限突減,同样由于有效 According to the estimation by the Leningrad Hydroelectric Design Branch of the Soviet Union about the sedimentation of reservoirs in the Sanmenxia Project on the Yellow River: 80% of the sediment discharged into the reservoir from the upstream of the reservoir will be deposited in the reservoir, and only 20% of the fine sediment will pass through Hydropower stations and dams into the lower reaches of the Yellow River. The annual average amount of mud discharged by the Yellow River in Sanmenxia is 1.36 billion tons. Therefore, 1.1 billion tons of silt will be deposited every year in Sanmenxia Reservoir, and 260 million tons will be discharged downstream. Due to the advancement of soil and water conservation in the loess area upstream of the Sanmenxia Reservoir, siltation of the reservoir will change significantly. After careful study, Leningrad Design Branch calculated that the amount of sediment to be stored in storage will be reduced by 20% from the current level in 1967 and will be reduced by 50% by the end of 1950. According to Leningrad Design Branch calculations, the sedimentation volume of the reservoir after 50 years is 33.6 billion square meters, accounting for nearly half of the total storage capacity. Leningrad Design Branch pointed out that: due to siltation of reservoirs, when the normal water level becomes smaller when the reservoir suddenly reduced, the same as effective