Abstract: This paper has proved that the ration formula of width to depth β=b/h=2m\+2+1-m is the best ladder shaped culvert section from many ways,which has a significance to realizing and applying the best engineering and hydraulic ladder shaped culvert section.

Key words: ladder shaped culvert section, best hydraulic, ration of width to depth

摘要： 笔者从各方面分析论证了梯形渠道水力最优断面宽深比为b/h =2 (1+m2 -m),对进一步认识梯形渠道水力最优及其应用具有一定意义.

关键词: 梯形渠道, 水力最优, 宽深比