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Flood Frequency Analysis of Chenab River for Predicting Peak Flows during Late Monsoon Period

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Document pages: 29 pages

Abstract: The River Chenab is one of the main western riversof the Indus River system in Pakistan, which undergoes intensive inundationalmost every year during the late monsoon period. The present study performsflood frequency analyses for the river basin as well as simulates differentlevels ofwater flow in the system to speculate all kinds of inundation under differentscenarios, i.e., to predict floodhazard and flood extended areas. Flood frequency analyses were performed atMARALA Headworks to Khanki Headworks. Data were collected from the Punjab Irrigation Department,Pakistan and from USGS and ASTER GDEM. The peak discharge of MARALA Headworks had been analyzed for 25 years. The preprocessing was performed in HEC Geo-RAS afterpreprocessing model run in HEC-RAS. After analysis the data were exported in HEC-RAS toARCMAP to generate a floodplain and inundation map. Ouranalysis generated the result that different areas would be under water in different return periods. Flood hazards maps for different return periods 10, 20, 50 and 100 years wereconducted using annual peaks flow of 35 years from 1980 to 2016. The maximum discharges at up and down stream fordifferent periods were obtained using Gumbel distribution model results which showedthat different areas were predicted under water indifferent return periods and affected areas after five years’ return period.

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