选取暴雨重现期T为1、2、10 a 3种典型年作为降雨条件，应用SWMM模型对南京市内秦淮河中段区域内的管网排水能力进行分析。模拟结果显示：T=1 a的暴雨条件下，研究区域内已有54％的检查井和38％的管道超载运行；在3种典型暴雨强度下，检查井和管道发生超载的时间基本都在降雨后2.5 h；随着暴雨强度的增加，超载运行的检查井和管道数未明显增加，但超载时明显延长。以上结果表明随着南京市城市化的加快，城市内不渗水面积增大，研究范围内管网排水能力无法满足现排水要求。该模拟结果可为城市的雨水管网改造提供依据。
英文摘要:
Three kinds of design rainstorm return period of T being1,2,10 years are chosen as the typical year to assess the drainage capacity of the study area by storm water management model(SWMM). The final result shows that 54％ manholes and 38％ conduits cannot meet requirements when the design rainstorm return period is one year.In the three typical storm intensity, manholes and pipes overload occurs basically in 2.5h after the rain.With the increase of storm intensity,the number of running overload manholes and pipes don't significantly increase, but the time of overload significantly prolonge.Therefore,with the speeding up of Nanjing urbanization and the increase of water seepage area, the drainage capacity in the study area can not meet the requirement.The simulation results can provide a technical support for reconstruction of drainage system.