有关回水长度变化规律的传统认识有其合理性，它是回水长度解析理论的一种特殊情况。
Traditional knowledge about the rule of backwater length variation is reasonable, which is a special case of analytic solution to backwater length.
水库回水末端判别标准的精度不仅影响回水长度的大小，在有些情况下甚至影响回水长度随流量变化的规律；
Criterion for the terminal of backwater may have effect not only on backwater length, but also on the rule of backwater length′s fluctuation with discharge.
空腔回水是制约有效空腔长度的一个主要因素，有时甚至是决定性因素。
Backwater is a main influential factor of the effective cavity length, almost a decisive one sometimes.
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