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淤地坝放水工程中的卧管及涵管，可视为有顶盖的衬砌渠道。认为水力最佳断面不能适用于有顶盖的衬砌渠道，提出了有顶盖衬砌渠道最佳宽深比的定义，并在此定义的基础上提出了计算最佳宽深比的公式。该公式可用于矩形断面、有顶盖（平顶及拱顶）的衬砌渠道。当净高分别是均匀流水深的４／３倍和３．５倍时，平顶衬砌渠道的最佳宽深比分别为１．４４５和３．１３４，拱顶为１．７４５，所建公式可应用于类似的建筑物，例如集水廊道等。
Warping dam drainage project in the laying of pipes and culverts, can be considered as lining of the lining channel. It is considered that the best hydraulic cross section can not be applied to the lining channel with top cover, and the definition of optimum aspect ratio of lining lining channel is proposed. Based on this definition, the formula for calculating the optimal aspect ratio is proposed. The formula can be used for rectangular cross-section, with cover (flat roof and vault) lining channels. When the net height is 4/3 times and 3.5 times of the average flow depth respectively, the optimum aspect ratio of the flat roof lining channel is 1.445 and 3.134, respectively, and the vault is 1.745. The formula Can be applied to similar buildings, such as water collection corridors.