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以高层建筑室外雨水汇水面积划分图为例，详细分析了高层建筑室外雨水系统设计中汇水面积，延缓系数以及地面集水时间的确定方法。
Taking the outdoor rainwater catchment area of high-rise building as an example, this paper analyzes in detail the design of catchment area, detention coefficient and ground catchment time of high-rise building outdoor rainwater system.