Title: Developing rainfall intensity-duration-frequency curves for Dodola catchment to estimate peak discharge using frequency analysis

Authors: Takele Sambeto Bibi

Addresses: Department of Water Supply and Environmental Engineering, College of Engineering, Madda Walabu University, P.O. Box 247, Robe, Ethiopia

Abstract: The development of intensity-duration-frequency (IDF) curves is one of the most common and useful tools to estimate peak discharge. The purpose of this study was to develop the IDF curves for five selected stations in the Dodola catchment. The Ethiopian Road Authority (ERA) reduction empirical formula was used to estimate the short-duration rainfall intensity from daily rainfall data. The L-moment ratio diagram and three goodness-of-fit tests were used to identify the best-fit probability distribution. The IDF curves that were constructed using regionalised distribution were compared with at-site IDF curves. The difference between the two sets of IDF curves small differences, also, shows the same trend for all selected return periods. These IDF curves will help in the estimation of peak discharge in the catchment.

Keywords: probability distribution; IDF curves; peak discharge; Dodola catchment.

DOI: 10.1504/IJHST.2023.134625

International Journal of Hydrology Science and Technology, 2023 Vol.16 No.4, pp.390 - 408

Received: 19 Nov 2021
Accepted: 15 Apr 2022
Published online: 01 Nov 2023 *

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