Design Flow and Stage Computations in the Teesta River, Bangladesh, Using Frequency Analysis and MIKE 11 Modeling
Publication: Journal of Hydrologic Engineering
Volume 16, Issue 2
Abstract
A case study was conducted in the Teesta subcatchment in Bangladesh for determining design flood flows and corresponding flood stages for different return periods using frequency analysis and MIKE 11 model. Different distribution functions of frequency analysis were tested for their goodness of fit. The observed discharge data at Kaunia on the river Teesta were used for estimation of design flood. The Pearson type-III distribution was found best fitted by the Kolmogorov-Smirnov, D-index, and L-moment diagram ratio tests, and accordingly 25-, 50-, and 100-year return period design floods were computed. The river network of Teesta River was extracted from SRTM 90-m digital elevation model. The river network of Teesta subcatchment was then simulated by MIKE 11 rainfall-runoff Nedbor-Afstromnings-Model (NAM) and HD model. The resultant time series of river stage was then compared with corresponding observed values. From the model, a stage-discharge relationship curve and respective equation were developed for Kaunia station on the river Teesta. The developed equation determines the corresponding flood stage of estimated flood flow of 25-, 50-, and 100-year return periods. The resulting flows and stages will be useful to design hydraulic structures, prepare flood extent maps, assess vulnerability of flood damage for different return periods, and provide flood forecasting for early warnings of floods. The approach presented would be applicable to similar river basin systems where data are limited and scarce.
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Acknowledgments
The writers would like to acknowledge the help extended by the BWDB in providing data. Mr. Md. Saiful Hossain (Executive Engineer, FFWC, BWDB, Bangladesh) is also acknowledged for his cooperation and for allowing us to use the relevant software in the center. The writers acknowledge the constructive suggestions received from Mr. A. K. M. Zeaul Hoque, DHI, Mr. S.M Mahbubur Rahman, Institute of Water Modeling, Dhaka, Bangladesh, and the anonymous reviewers.
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Published In
Journal of Hydrologic Engineering
Volume 16 • Issue 2 • February 2011
Pages: 176 - 186
Copyright
© 2011 ASCE.
History
Received: Jul 6, 2009
Accepted: Jul 21, 2010
Published online: Jul 22, 2010
Published in print: Feb 2011
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