Determination of Rainfall Intensity Formula and Intensity Duration Frequency (IDF) Curve at the Quelicai Administrative Post, Timor Leste

Aderita Mariana Takeleb; Qonaah  Rizqi Fajriani; Miguel  Antonio Ximenes

Aderita Mariana Takeleb Department of Civil Engineering, Dili Institute of Technology, Dili, Timor-Leste
Qonaah Rizqi Fajriani Department of Civil Engineering, Universitas Negeri Yogyakarta. Indonesia
Miguel Antonio Ximenes Department of Civil Engineering, Dili Institute of Technology, Dili, Timor-Leste

Keywords: Rainfall Intensity, Intensity Duration Frequency (IDF), Sherman Formula, Mononobe method

Abstract

The intensity of rainfall is a very important input in the work of water resources, especially related to flooding, erosion, and landslides. The flash flood that occurred in the study area was one of the impacts of the high intensity of the rain that occurred. This study aims to obtain a suitable empirical formula for estimating rainfall intensity and the Intensity Duration Frequency (IDF) curve. The empirical formula used includes Talbot, Sherman, Ishiguro while the design rainfall is obtained from the calculation of frequency analysis with various return periods. The selected method is based on the smallest error value which is determined by comparing the value of the rain intensity of the Mononobe method with the calculation results of the three equations through the Talbot, Sherman, and Ishiguro formula approaches. Test of the comparison with the peak-weighted root mean square error test. The results showed that the method of rainfall intensity according to the Quelicai daily rainfall data was the Mononobe method with the Sherman equation. The result of Sherman formula demonstrated that the formula has compatible with Mononobe method due to a smaller average error than the other two equations, therefore recommended to estimate the rainfall intensity and IDF curve in the study area.

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