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Possibilities of urban flood reduction through distributed-scale rainwater harvesting

查看全文 作　　者：Aysha [1,2]Akter;Ahad Hasan [2]Tanim;MdKamrul [3]Islam 高影响力作者 机构地区：[1]Department of Civil Engineering,Chittagong University of Engineering&Technology(CUET),Chittagong 4349,Bangladesh;[2]Center for River,Harbor and Landslide Research,Chittagong University of Engineering&Technology(CUET),Chittagong 4349,Bangladesh;[3]Department of Urban and Regional Planning,Chittagong University of Engineering&Technology(CUET),Chittagong 4349,Bangladesh高影响力机构 出　　处：《Water Science and Engineering》索引2020年第13卷第2期,共11页高影响力期刊 基　　金：supported by a fund on a day-to-day basis provided by the Department of Civil Engineering,Chittagong University of Engineering&Technology(CUET),Bangladesh. 摘　　要：Urban flooding in Chittagong City usually occurs during the monsoon season and a rainwater harvesting(RWH)system can be used as a remedial measure.This study examines the feasibility of rain barrel RWH system at a distributed scale within an urbanized area located in the northwestern part of Chittagong City that experiences flash flooding on a regular basis.For flood modeling,the storm water management model(SWMM)was employed with rain barrel low-impact development(LID)as a flood reduction measure.The Hydrologic Engineering Center's River Analysis System(HEC-RAS)inundation model was coupled with SWMM to observe the detailed and spatial extent of flood reduction.Compared to SWMM simulated floods,the simulated inundation depth using remote sensing data and the HEC-RAS showed a reasonable match,i.e.,the correlation coefficients were found to be 0.70 and 0.98,respectively.Finally,using LID,i.e.,RWH,a reduction of 28.66%could be achieved for reducing flood extent.Moreover,the study showed that 10%e60%imperviousness of the subcatchment area can yield a monthly RWH potential of 0.04e0.45 m3 from a square meter of rooftop area.The model can be used for necessary decision making for flood reduction and to establish a distributed RWH system in the study area. 关 键 词：Low-impact development(LID) SWMM HEC-RAS Remote sensing Urban flooding Inundation depth
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