Abstract
Mumbai city having an area of 437sq km with a population of 12 million came to a complete halt due to the unprecedented rainfall of 944 mm during the 24 hours starting on 26 th July 2005; with 380 mm falling in just 3 hours between 14:30 to 17:30 and hourly rainfall exceeding 190 mm/hr. The severity of flood was such that it took 447 lives in Mumbai alone. The financial cost of flood was unprecedented and affected the entire commercial, trading, and industrial activity for 3 days. The present study uses the HEC-HMS 3.4 (Hydrologic Engineering Centre's-Hydrologic Modeling System) and HEC-RAS 4.0 (Hydrologic Engineering Centre's-River Analysis System). The flow and water surface depth have been simulated for various flood scenarios using the model HEC-HMS 3.4 and HEC-RAS 4.0 respectively for rainfall intensities varying from 25 mm/hr. to 200 mm/hr in increment of 25 mm/hr. Runoff and water surface depth at a upstream and downstream of detention pond have been obtained for various rainfall scenarious.. The simulation result shows maximum peak reduction of 21% by JVLR (Jogeshwari- Vikhroli link road) flood detention pond. It has been seen that efficiency of JVLR detention pond decreases as the rainfall intensity increases above 50 mm/hr. Accordingly this study can be used in flood forecasting for various rainfall scenarios, sustainable development and flood management plans of Mithi River catchment. Keywords: Urbanization, Flood, Mithi River, Flood detention pond, HEC-HMS 3.4, HEC-RAS 4.0.
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