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应采用各种洪水年型都包得住的水位作为防洪设计水位才是安全的，否则就会出现水位达到了历年最高，可流量还远未达到；或流量达到了设计频率而相应水位达不到设计值；筑堤洪水归槽，水位壅高，防洪水位还要加上壅高值。因此，河道上的防洪水位确定是很复杂的。由年最大水深计算频率求设计水位和由年最大流量频率值求设计水位，但都要采用外包线上限值；为此，提出４ 种计算筑堤后洪水归槽水位壅高的方法。
Should be used in all types of flood water can be surrounded by the water level as a flood control design is safe, otherwise there will be water levels reached the highest in calendar year, the flow is far from reaching; or the flow rate reached the design frequency and the corresponding water level up To the design value; embankment floods to trough, water level 壅 high flood control level should also add 壅 high value. Therefore, the determination of flood control level in the river is very complicated. From the calculation of the maximum water depth of the year to the designed water level and the design water level from the annual maximum flow frequency value, the upper limit value of the outsourcing line should be adopted. Therefore, four methods for calculating the flood water level after embankment are proposed are proposed.