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本文从临界水深在明渠水流中的作用出发，全面阐述了梯形断面明渠临界水深的求解方法，所给出的ＦＯＲＴＲＡＮ程序、公式（５）、（６）及表１，可供各种条件下使用。
Based on the role of critical water depth in open channel flow, a comprehensive description of the method for solving critical depth of open channel in trapezoidal section is given. The FORTRAN program, formulas (5) and (6), and Table 1 are available for various conditions .