Abstract Green Roofs (GRs) are a form of sustainable, low impact development. They can reduce peak stormwater runoff and improve the quality of the runoff from buildings and developments. The water captured by the GRs can be used as a resource for irrigation and domestic water by installing rainwater tanks under the drainpipe of the roof. However, few studies have focused on the relationship between GRs modelling and the management or design for rainwater tanks to avoid roof runoff. In this study, in order to give some useful advices to optimize the management or design of rainwater tanks, the three models were tested to get the one that best reflects the truth of GRs. In this part, a one-reservoir conceptual interflow model (CI-MODEL) considering the interflow of the GRs was used to predict the performance of GRs, and been compared by the Storm Water Management Model (SWMM), and the physical process model (HYDRUS-1D) based on observed rainfall and runoff data. After the comparison from 0.4 to 2.0 mm/min rainfall intensities, it was concluded that the CI-MODEL is a useful tool in modelling GRs. According to those conclusions of CI-MODEL, some advices could been given to affect the management and design of rainwater tanks to limit the waste of runoffs that can be reused. (1) When it rains, the runoff start time is short. So that, the wisest thing is to empty rainwater tanks before it rains. If this is difficult, it is acceptable to empty it within 25 min of the onset of rain; (2) The volume of the rainwater tanks is better larger than 0.045 m3 for per unit area (m2) of GRs. Besides, this value is calculated by the area and depth of the GRs in this study.

中文翻译：

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屋顶绿化内流的建模研究

摘要 屋顶绿化 (GRs) 是一种可持续的、低影响的发展形式。它们可以减少峰值雨水径流并提高建筑物和开发项目的径流质量。通过在屋顶排水管下安装雨水箱，GRs 捕获的水可用作灌溉和生活用水的资源。然而，很少有研究关注 GRs 建模与雨水箱管理或设计之间的关系，以避免屋顶径流。在这项研究中，为了给优化雨水箱的管理或设计提供一些有用的建议，对三种模型进行了测试，以获得最能反映遗传资源真实性的模型。在这部分中，考虑到 GRs 互流的单水库概念互流模型（CI-MODEL）用于预测 GRs 的性能，并通过雨水管理模型 (SWMM) 和基于观测降雨和径流数据的物理过程模型 (HYDRUS-1D) 进行比较。在比较 0.4 到 2.0 毫米/分钟的降雨强度后，得出的结论是 CI-MODEL 是模拟 GR 的有用工具。根据CI-MODEL的这些结论，可以对影响雨水池的管理和设计提出一些建议，以限制可再利用的径流的浪费。(1)下雨时，径流开始时间短。所以，最明智的做法是在下雨前清空雨水箱。如果这很困难，可以在下雨后 25 分钟内将其清空；(2) 雨水箱容积宜大于0.045 m3，单位面积（m2）GRs。此外，该值是根据本研究中GRs的面积和深度计算得出的。