In this study, a parsimonious framework for supporting Water Sensitive Urban Design (WSUD) was proposed to seek a tradeoff between investment of WSUD features and mitigation of urban flood damage. A two-dimensional (2D) hydrological-hydraulic simulation model, PCSWMM, was adopted to simulate the rainfall-runoff process and inundation scenarios, and the flood damages was evaluated based on inundated water depths and damage curves. The sensitivity of deploying various design features to flood control effects was also tested, which provided useful information for identifying potential design parameters (like conduit sizes and pond locations). The proposed framework was applied to a hypothetical case adapted from an urban district in the tropical region considering various WSUD features (i.e. rainwater storage pond, rain garden, and conduit upgrading). The results showed that when the gross investment of WSUD features increased from 0 to 1.19 million $, the damage cost would decrease from 4.61 to 3.41 million $; a linear relationship (with a R-square fit at 0.9) was found suitable to represent the relationship between the investment and the damage. The proposed framework is effective in helping assess the balance between mitigation of urban flood damage and adoption of WSUD features, and could be used to support urban water managers for a more science-based decision making towards flood risk management.

中文翻译：

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在城市防洪中评估 WSUD 特征的简约框架

在这项研究中，提出了一个支持水敏感城市设计 (WSUD) 的简约框架，以在 WSUD 功能的投资和减轻城市洪水破坏之间寻求权衡。采用二维（2D）水文水文模拟模型PCSWMM模拟降雨-径流过程和淹没情景，并根据淹没水深和损害曲线评估洪水损害。还测试了部署各种设计特征对防洪效果的敏感性，这为识别潜在的设计参数（如管道尺寸和池塘位置）提供了有用的信息。考虑到各种 WSUD 特征（即雨水储存池、雨水花园和管道升级），建议的框架被应用于一个假设案例，该案例改编自热带地区的一个城区。结果表明，当WSUD特征的总投资从0增加到119万美元时，损害成本将从461美元减少到341万美元；发现线性关系（R 平方拟合为 0.9）适合表示投资与损害之间的关系。提议的框架有助于评估减轻城市洪水破坏与采用 WSUD 功能之间的平衡，并可用于支持城市水资源管理者针对洪水风险管理做出更科学的决策。9) 被认为适合代表投资与损害之间的关系。提议的框架有助于评估减轻城市洪水破坏与采用 WSUD 功能之间的平衡，并可用于支持城市水资源管理者针对洪水风险管理做出更科学的决策。9) 被认为适合代表投资与损害之间的关系。提议的框架有助于评估减轻城市洪水破坏与采用 WSUD 功能之间的平衡，并可用于支持城市水资源管理者针对洪水风险管理做出更科学的决策。