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以间接法确定设计流量时,与桥涵水文工作者的经验、调查分析工作的深入细致程度关系很大。在使用上还有实际困难,所得结果往往精度不高。近年来,我们用我国多年平均洪水流量模数及其参数进行大、中桥设计流量的计算。这一方法不会因经验不足而造成大的差误。它是基于对一些河流观测到的洪水资料的分析,找出其中流量与某些参变数的关系,再应用到条件类似的河流中去。若在同一地区内,气候条件相似,汇水区内的土壤条件、地表植物情况都相同,则洪水流量只与汇水面积的某些几何数值有关,
When determining the design flow by indirect method, it has a great relationship with the experience of bridge and culvert hydrologists and the in-depth and detailed investigation and analysis work. There are practical difficulties in the use, the results are often not accurate. In recent years, we use China’s many years average flood flow modulus and its parameters for large and medium bridge design flow calculation. This method does not cause major errors due to lack of experience. It is based on the analysis of flood data observed in some rivers and finds the relationship between the flow and some parameters and then applied to rivers with similar conditions. If the climatic conditions are similar in the same area and the soil conditions in the catchment area and the surface vegetation are the same, the flood discharge is only related to some geometric values of the catchment area,