关于城市雨水管渠水力计算方法的探讨

Discussion on Hydraulic Calculation Methods of Urban Storm Sewer

简要介绍了传统推理公式法应用于城市雨水管渠设计流量计算的两种形式——面积叠加法和流量叠加法,并通过工程实例分析两种计算方法的特点及区别。结果表明,相同设计条件下,应用流量叠加法计算所得管渠设计流量比面积叠加法计算所得值大,两者差值随设计暴雨重现期P、折减系数m的增大而增大,但随地面集水时间t1的增大而减小;两种计算方法的设计流量增长率x随P、t1的增大而减小,随m的增大而增大。

Two traditional rational methods applied to design er, area superposition method and flow superposition method, were differences of the two calculation methods were analyzed flow calculation of urban storm sewintroduced. The characteristics and through an example project. The results showed that under the same design conditions, a calculated value using the flow superposition method was larger than that using the area superposition method. The difference between the two methods increased with the design storm return period （P） and reduction factor （m）, but decreased with ground water catchment time （t1 ）. The design flow rate（x）of the two methods decreased with P and t1, and increased with m.