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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，包括复式渠槽小比例尺和大比例尺的试验资料、河道原型实测资料。现提出了两个关键的比率，即总流量比满槽流量、槽流量比滩流量，并从理论上分析了它的重要性，其适用性也在不同比例尺各种形状的光滑或均匀粗糙复式渠槽中得到了验证。复合断面总流至与满槽流量的比值，仅是断面几何形状的函数，而与底坡、比例尺的大小无关，槽流量与滩流量的比值，也与底坡、比例尺无关，但受滩地洪水横向坡降的影响。文中还对公式中与水深比有关的系数和指数作了估计。建议利用比值来预报复式均匀糙率渠糟流量的简单方法，随着相关资料的积累，对其它的情况，也可能适用。
There is not yet a completely satisfactory estimation method for the overcurrent capability of multichannel trenches and channels. However, a large amount of experimental data have been obtained, including experimental data on small scale and large scale of multi-channel trenches, and experimental data on river channel prototypes. Two key ratios are now proposed, namely the total flow rate is more than the full tank flow rate, the tank flow rate is more than the beach flow rate, and its importance is theoretically analyzed. Its applicability is also varied in different scales with various shapes of smooth or even rough complex Trench has been verified. The ratio of the total cross-section flow to the full-slot flow is only a function of the cross-section geometry, and is not related to the size of the slope or scale. The ratio of flume to the discharge is also independent of the slope and scale, The impact of horizontal gradient. The paper also estimates the coefficients and indices related to the water depth ratio in the formula. It is recommended that a simple method of using ratios to predict the mean flow rate of a multiple roughness is also applicable to other situations as the relevant data are accumulated.