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对复式渠槽和河道的过流能力还没有一个完全令人满意的估算方法，但已有大量的实验资料，包括复式渠槽小比尺和大比尺的试验资料，还有河道原型实测资料。提出了两个关键的比率，即总流量比满槽流量和主槽流量比边滩流量，并从理论上分析了它的重要性，其适用性也在各种形状不同比尺的光滑或均匀粗糙复式渠槽中得到了验证。复合断面总流量与满槽流量的比值仅是断面几何尺寸的函数，而与底坡、比尺的大小无关，主槽流量与边滩流量的比值也与底坡、比尺无关，但受滩地横向底坡的影响。给出了公式中与水深比有关的系数和指数，建议利用这些流量比值来预报约定形状的复式均匀糙率渠槽的流量，这是一种比较简单的方法，随着相关资料的积累，这种方法可扩大应用于其他情况。
There is not yet a completely satisfactory estimation of the overcurrent capacity of multichannel trenches and channels, but a large number of experimental data have been obtained, including experimental data on microtubes and large scales in compound trenches, as well as experimental data . Two key ratios are proposed, namely, the total flow ratio is more than the full tank flow and the main tank flow is more than the side flow, and its importance is theoretically analyzed. Its applicability is also smooth or uniform in various scales with different scales Rough double trench has been verified. The ratio of total cross-section flow to full-slot flow is only a function of cross-section geometry, but not to the size of the slope or scale, and the ratio of main channel flow to side beach flow is also independent of slope and scale, Effect of horizontal slope. The coefficients and indices related to the water depth ratio in the formula are given. It is suggested that these flow ratios be used to predict the flow rate of the well-defined uniform roughness channel. This is a relatively simple method. With the accumulation of relevant data, this The method can be expanded for other situations.