http://www.iaeme.com/IJCIET/index.asp 56 editor@iaeme.com International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 3, May–June 2016, pp. 56–66, Article ID: IJCIET_07_03_006 Available online at http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=7&IType=3 Journal Impact Factor (2016): 9.7820 (Calculated by GISI) www.jifactor.com ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication ASSESSMENT OF FLOOD MITIGATION MEASURE FOR MITHI RIVER – A CASE STUDY Rituparna Choudhury, B.M. Patil, Vipin Chandra Bharati Vidyapeeth Deemed University, College of Engineering, Department of Civil Engineering, Pune–43, Maharashtra, India Uday B. Patil, T. Nagendra CWPRS, Khadakwasla, Pune–23, Maharashtra, India ABSTRACT Mumbai city which has an area of 437sq km with a population of 12 million came to an abrupt halt because of the unprecedented rainfall of 944mm during the 24 hours starting on 26th July 2005; with 380mm occurring in just 3 hours between 14:30 to 17:30 and hourly rainfall exceeding 126 mm/hr. This particular event is considered to be an extra-ordinary event. Numerical model study using one dimensional mathematical model HEC-RAS is carried out to simulate unsteady flow in Mithi river with the existing conditions and with the telescopic channelization as suggested by MMRDA for 100 years return period and 6 hours storm duration. The appropriate boundary conditions at the upstream, downstream and the internal boundaries were applied. The results indicated that due to the channelization, the average reduction in the water level is of the order of 20 % to25 % and the increase in the conveyance capacity of Mithi River causing rapid flushing of floods, is found to vary from 23% to 340% which is quite significant compared to existing conditions at various locations along the river. Thus the telescopic channelization is found to be effective for mitigating floods. Keywords: Mithi River, HEC-RAS, Floods, Unsteady flow, Hydrograph, Channelization Cite this Article: Rituparna Choudhury, B.M. Patil, Vipin Chandra, Uday B. Patil and T. Nagendra, Assessment of Flood Mitigation Measure For Mithi River – A Case Study, International Journal of Civil Engineering and Technology, 7(3), 2016, pp. 56–66. http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=7&IType=3