Inadequate drainage capacity often fails to offer the desired response in urban flooding. This aim of this study was to develop a flood hazard map through a field survey and numerical modelling. The field survey comprises cross-sectional data for tertiary drains; these are then transferred for setting up the numerical model. To feature flooding conditions, both hydrological and hydraulic model studies were carried out using the Hydrologic Engineering Center–hydrologic modelling system (HEC-HMS) developed by the US Army Corps of Engineers, and the personal computer storm water management model (PCSWMM). The use of HEC-HMS generated the runoff; the PCSWMM model simulation was carried out for 760 conduits and 693 junctions in the city that was studied. Three major outlets were considered for model calibration for 2014, the model simulated runoff showed a reasonable match with field records – that is, R² = 0.782, R² = 0.719 and R² = 0.768 for the reaches Chaktai Khal, Rajakhali Khal and Mahesh Khal, respectively. Thus, the validated model was used for flood hazard mapping. It is envisaged that development authority and city planners would benefit from this coupled model.

中文翻译：

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城市尺度的城市洪水建模和绘图

排水能力不足往往无法在城市洪水中提供理想的应对措施。本研究的目的是通过实地调查和数值模拟绘制洪水灾害图。实地调查包括三级排水沟的横断面数据；然后将这些转移以建立数值模型。为了描述洪水条件，使用美国陆军工程兵团开发的水文工程中心水文建模系统 (HEC-HMS) 和个人计算机雨水管理模型 (PCSWMM) 进行了水文和水力模型研究。使用 HEC-HMS 产生径流；PCSWMM 模型模拟是针对所研究城市的 760 条管渠和 693 个交叉点进行的。2014年模型校准考虑了三大网点， 对于河段 Chaktai Khal、Rajakhali Khal 和 Mahesh Khal，R ²  = 0.782、R ²  = 0.719 和R ^{2 = 0.768。}因此，经过验证的模型被用于洪水灾害绘图。预计发展当局和城市规划者将从这种耦合模型中受益。