Wang Sheng, Wei Wanzhen, Feng Lidan, Yuan Yezi, Wang Zeyang
State Key Laboratory of Water Pollution Control and Green Resource Recycling, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Key Laboratory of Yangtze River Water Environment (Ministry of Education), Tongji University, Shanghai 200092, China E-mail:
Water Sci Technol. 2025 Aug;92(4):577-591. doi: 10.2166/wst.2025.122. Epub 2025 Aug 11.
In urban stormwater source control design, the current method statistically obtains the design target-daily rainfall relationship and uses daily rainfall as the design storm to calculate the size of source control. Since it lacks the rainfall duration needed for sizing calculations under the design storm, it cannot ensure that the design solution achieves the design target. To overcome this problem, this study proposes a statistical method to obtain an hour-level design storm. It includes hour-level event identification, the concept of design storm event set, and a method to obtain the design target-rainfall-duration-maximum 1-h rainfall relationship. Model-based case study results suggested that rainfall volume control was more suitable than rainfall event percentile control as a design target because design solutions achieved the former but not the latter. Across six climate conditions, rainfalls and durations had logarithmic correlations ranging from 0.8454 to 0.9868. The positive near-monotonic relationships supported the source control sizing calculation under the design storm. Besides, a maximum 1-h rainfall could be used to calculate the hydraulic conductivity of planting soil layers, ensuring that the runoff peak penetrates the source control rather than off-site discharge through overflow. The hour-level design storm includes rainfall duration and maximum 1-h rainfall that vary with design target and design rainfall, which is an advantage over a day-level design storm.
在城市雨水源头控制设计中，当前方法通过统计得出设计目标与日降雨量的关系，并将日降雨量用作设计暴雨来计算源头控制的规模。由于其缺乏设计暴雨下规模计算所需的降雨持续时间，因此无法确保设计方案实现设计目标。为克服这一问题，本研究提出一种统计方法来获取小时级设计暴雨。该方法包括小时级事件识别、设计暴雨事件集的概念以及获取设计目标 - 降雨持续时间 - 最大1小时降雨量关系的方法。基于模型的案例研究结果表明，作为设计目标，降雨量控制比降雨事件百分位数控制更合适，因为设计方案能够实现前者但无法实现后者。在六种气候条件下，降雨量和持续时间的对数相关性在0.8454至0.9868之间。这种正的近单调关系支持了设计暴雨下的源头控制规模计算。此外，最大1小时降雨量可用于计算种植土层的水力传导率，确保径流峰值穿透源头控制而非通过溢流场外排放。小时级设计暴雨包括随设计目标和设计降雨量而变化的降雨持续时间和最大1小时降雨量，这是相对于日级设计暴雨的一个优势。
