城市雨水管网集蓄雨水径流资源潜能分析

Potential analysis of rainwater runoff resources collected by urban rainwater pipe network

城市雨水管网具有可观的集蓄空间,在不影响城市雨洪排水的前提下,利用管网进行雨水的动态蓄存,可作为一般雨水集蓄设施的替代方案。以西安市某高校校内雨水排水系统为研究案例,基于SWMM构建区域雨水排水模型,按照不同原则设置3种阻水方案,计算不同降雨条件下各方案存蓄的雨水水量。结果表明,3种方案不发生漫溢的临界降雨量均为8 mm,此时雨水蓄存量分别为2 367、2 325、1 989 m^(3),分别占管网总容积的88.61%、87.04%、74.46%。进一步分析2011至2020年西安市雨水管网集蓄雨水资源的潜能,最大年平均蓄存雨水量可达4.11×107m^(3),占年平均降水量的12.13%,蓄存能力可观。

The usage of urban storm sewer systems with ample room to collect rainwater can be used as an alternative to general rainwater harvesting and storage facilities under the assumption that it won't impair urban storm water drainage.By building up a water barrier in SWMM,the regional stormwater drainage model was created using three different principles.The volume of rainwater harvested under various rainfall situations was calculated using the stormwater drainage system of a university in Xi'an as a research case.The results show that 8 mm was the critical rainfall to avoid overflow for these three schemes and the volume of rainwater harvested in the case was 2367,2325 and 1989 m respectively,accounting for 88.61%,87.04%and 74.46%of the total volume of storm sewer systems.Further analysis of the potential of rainwater harvested by the storm sewer systems in Xi'an from 2011 to 2020 shows that the maximum annual average storage of rainwater can reach 4.11×107m^(3),accounting for 12.13%of the average annual precipitation.The findings indicated that the storage capacity of urban storm sewer systems is considerable.