IJEP 42(2): 194-199 : Vol. 42 Issue. 2 (February 2022)
Utkarsh Upadhyaya, Ajai Singh*, Birendra Bharti and Kumar Nischal
Central University of Jharkhand, Department of Water Engineering and Management, Ranchi – 835 205, Jharkhand, India
The increase in imperviousness of land and a decrease in infiltration due to urbanization causes ample amount of surface runoff, which has become a serious problem in unplanned cities. The rainfall intensity-duration-frequency (IDF) relationship is one of the most commonly used tools for urban stormwater modelling. In the present paper, estimation of design rainfall intensity based on intensity–duration–frequency (IDF) curves for Ranchi city was made. IDF curves for short duration rainfall (5 min, 15 min, 30 min, 1 hr, 2 hr, 6 hr, 12 hr and 24 hr) were plotted with the return period of 2, 5, 10, 25, 50, and 100 years. Extreme value type I (EVI) gumbel distribution was used to find design storms for various return periods. The results obtained presented that the correlation coefficient is very high representing goodness of fit of the formulae to estimate IDF curves in the region of interest.
Mann-Kendall’s test, Gumbel distribution, Intensity-duration-frequency curve, Ranchi
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