【摘要】 选取天津市某小区,采用美国环保署开发的SWMM模型,模拟得出小区在开发建设前后的区域出口流量过程线和总径流量,分析评价了蓄水池和下凹绿地对小区雨水径流情况的影响。计算满足建设用地外排雨水设计流量不大于开发建设前水平这一条件时,蓄水池的设计体积和下凹绿地的面积以及下凹深度。模拟结果表明,蓄水池和下凹绿地可同时消减洪峰,推迟峰现时刻,提高雨水利用率。更多还原

【Abstract】 The Storm Water Management Model(SWMM) developed by EPA is adopted in an urban community of Tianjin City.According to the model,the regional outflow curve and the total runoff volume before and after the community construction are simulated,and the impact of storage tank and grass swale on the community runoff is analyzed.At the conditions that the designing flow rate of rain drainage from the land not more than that before construction,the volume of water storage tank and space as well as depth of grass swale are calculated.The simulation result shows that both the storage tank and grass swale can reduce the flood peak and postpone the peak time so as to increase the utilization rate of rainwater.更多还原