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Rainfall Intensity-Duration-Frequency Analysis for Pune and Vadgaon Maval Regions Using L-Moments of LN2, EV1, GEV and Pareto Distributions

N VIVEKANANDAN

Abstract


Intensity-Duration-Frequency (IDF) of rainfall is considered as one of the important tools for planning and designing of various water resource projects. This can be achieved through IDF analysis by developing of IDF curve, which gives a plot of rainfall intensity versus rainfall duration and frequency (i.e., return period). This paper presents a study on rainfall IDF analysis using L-Moments of 2-parameter Log Normal, Extreme Value Type-1 (EV1), Generalized Extreme Value (GEV) and Pareto for Pune and Vadgaon Maval regions. The selection of best fit distribution for rainfall estimation is examined by quantitative assessment using Goodness-of-Fit (viz., Chi-square and Kolmogorov-Smirnov) and diagnostic (viz., D-index) tests and qualitative assessment using the fitted curves of the estimated rainfall. From the estimated 1-day maximum rainfall by EV1 for Pune and GEV for Vadgaon Maval, the shorter duration (say, 1-hour (hr), 2-hr, 3-hr, 6-hr, 12-hr, 18-hr and 24-hr) of rainfall is derived from IMD 1/3rd rule formula and considered in developing the IDF curves. The performance of rainfall IDF analysis is evaluated by using correlation coefficient and mean absolute error. The paper presents the methodology adopted in EVA of rainfall and IDF analysis, and the results obtained from the study.

 

Keywords:    Chi-Square, Correlation Coefficient, D-index, Extreme Value Type-1, Generalized Extreme Value, Intensity-Duration-Frequency, Kolmogorov-Smirnov, Rainfall, Mean Absolute Error


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