A novel methodological framework for urban drainage adaptation to climate change is introduced and tested in a small urban basin. The impact of climate change on Intensity-Duration-Frequency curves and on urban drainage is reported. The flood mitigation measures comprised both green and grey alternatives, i.e., permeable surfaces and sewer enlargement. The Storm Water Management Model (SWMM5) was calibrated and employed. Prior to calibration, sensitivity analysis of SWMM hydrologic-hydraulic and permeable surfaces input parameters was conducted using a global sensitivity analysis method. Two novel indices, the Index for Reliability of Urban Drainage Adaptation (IRUDA) and the Climate Variability Adaptation Index (CVAI), were also introduced. IRUDA assesses the total reliability of an urban drainage network in hydraulic, temporal and volumetric terms. Sizing of flood mitigation measures was undertaken employing construction cost along with IRUDA. CVAI was used for alternative selection among different flood mitigation scenarios. CVAI assesses the total adaptive capacity of the drainage network based on hydrological, hydraulic and economic aspects of the proposed adaptation plan. A forward uncertainty propagation scheme was employed on the selected alternative in order to examine input data and parametric uncertainty with respect to the peak discharge at the outlet of the basin. Finally, monetization of ecosystem services offered by green measures is presented. The simulation results for the study area illustrated that under the non-stationarity assumption future rainfall intensities and urban flooding risk will increase, and therefore, further flood mitigation measures will be required. Furthermore, the majority of the adaptation strategies examined were found to improve the capacity and reliability of the drainage network. Moreover, the results revealed that permeable pavements perform better for storm events with return period of up to five years. Overall, it can be concluded that design criteria need to be reviewed and also green measures, such as permeable surfaces, can be introduced in the design procedure.

在一个小型城市流域中引入并测试了一种新的城市排水适应气候变化的方法论框架。报告了气候变化对强度-持续时间-频率曲线和城市排水系统的影响。洪水缓解措施包括绿色和灰色替代措施，即可渗透表面和扩大下水道。对雨水管理模型 (SWMM5) 进行了校准和使用。在校准之前，使用全局敏感性分析方法对 SWMM 水文-水文和渗透表面输入参数进行敏感性分析。还引入了两个新指数，城市排水适应可靠性指数（IRUDA）和气候变化适应指数（CVAI）。IRUDA 评估城市排水管网在水力、时间和体积术语。与 IRUDA 一起使用建筑成本来确定防洪措施的大小。CVAI 用于在不同的防洪方案中进行备选选择。CVAI 根据提议的适应计划的水文、水力和经济方面评估排水管网的总适应能力。在选定的替代方案上采用了前向不确定性传播方案，以检查与盆地出口处的峰值流量有关的输入数据和参数不确定性。最后，介绍了绿色措施提供的生态系统服务的货币化。研究区的模拟结果表明，在非平稳假设下，未来降雨强度和城市洪水风险将增加，因此，需要采取进一步的防洪措施。此外，研究发现大多数适应策略可以提高排水网络的容量和可靠性。此外，结果表明，透水路面在暴风雨事件中表现更好，重现期长达五年。总的来说，可以得出结论，需要审查设计标准，并且可以在设计过程中引入绿色措施，例如可渗透表面。