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1986年以来，由于龙羊峡、刘家峡两水库汛期大量蓄水，减小了潼关洪水的洪峰流量，并缩短了3000m3／s以上流量的历时。据统计，1960～1994年的35a中，7月15日以前出现大于3000m3／s洪峰的几率约为46％，7月30日前约为83％，8月4日前约为97％，在出现了第一场洪水后，再次出现大于5000m3／s洪水的几率很小。因此，提出在实际调度中，将潼关站出现3000m3／s洪峰作为泄洪排沙的标准，以流量与黄河下游最有利排沙流量是基本相适应的。此外，还对1989年以来利用第一场洪水排沙下游淤积情况进行了分析。
Since 1986, due to the large number of impoundments in the flood season of Longyangxia and Liujiaxia reservoirs, the flood peak discharge of Tongguan floodwater has been reduced and the duration of flow above 3000m3 / s has been shortened. According to statistics, from 35 years in 1960-1994, the probability of occurrence of flood peak greater than 3000m3 / s before July 15 is about 46%, about 83% before July 30 and about 97% before August 4, After the first flood, there is a small chance of recurrence of more than 5000m3 / s floods. Therefore, it is proposed that in the actual dispatch, the peak of 3000m3 / s at Tongguan station should be taken as the standard of discharge and sediment discharge, and the discharge should be basically compatible with the most favorable sediment discharge in the lower Yellow River. In addition, the use of the first flood sediment deposition in the downstream sedimentation since 1989 was analyzed.