Integrating low impact development practices with GIS and SWMM for enhanced urban drainage and flood mitigation: A case study of Gurugram, India

Simran Sehrawat, Sulochana Shekhar
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Abstract

Urban flooding presents a critical challenge in rapidly urbanizing regions due to the proliferation of impervious surfaces and inadequate traditional drainage systems. The integration of Low Impact Development (LID) strategies offers a promising approach to mitigate these issues by enhancing decentralized stormwater management. This study investigates the efficacy of LID practices in mitigating urban flooding within Gurugram, India, a rapidly urbanizing city facing challenges from inadequate drainage infrastructure and increased impervious surfaces. Utilizing the Storm Water Management Model (SWMM) and Geographic Information Systems (GIS), the study simulated runoff dynamics across eight high-runoff sub-catchments under five scenarios: a baseline (no LID) and four incorporating green roofs, permeable pavements, rain barrels, and a combination of all three. Results demonstrate significant reductions in runoff volume and peak discharge across all LID scenarios, with green roofs exhibiting the highest individual effectiveness (maximum 52.92% runoff reduction). The combined LID approach yielded the most substantial improvements (up to 72.31% runoff volume and 54.05% peak discharge reduction), highlighting the synergistic benefits of integrated stormwater management strategies. The study also addresses the challenges of LID implementation, including maintenance requirements and socio-economic considerations, emphasizing the need for comprehensive urban planning and policy support to ensure long-term success.
将低影响发展实践与地理信息系统和SWMM相结合,加强城市排水和防洪:以印度古鲁格拉姆为例
由于不透水表面的扩散和传统排水系统的不足,城市洪水在快速城市化地区提出了一个严峻的挑战。通过加强分散的雨水管理,低影响发展(LID)战略的整合为缓解这些问题提供了一种有希望的方法。本研究调查了印度Gurugram的LID实践在缓解城市洪水方面的效果。Gurugram是一个快速城市化的城市,面临着排水基础设施不足和不透水表面增加的挑战。利用雨水管理模型(SWMM)和地理信息系统(GIS),该研究在五种情景下模拟了八个高径流子集水区的径流动态:基线(无LID)和四种包含绿色屋顶、透水路面、雨桶以及所有三种情景的组合。结果表明,在所有LID方案中,径流量和峰值流量都有显著减少,其中绿色屋顶表现出最高的个体有效性(最大减少52.92%的径流量)。综合LID方法产生了最显著的改善(高达72.31%的径流量和54.05%的峰值排放量减少),突出了综合雨水管理策略的协同效益。该研究还探讨了LID实施的挑战,包括维护要求和社会经济因素,强调需要全面的城市规划和政策支持,以确保长期成功。
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