Formulation of rainfall intensity and Intensity Duration Curve (IDF) which appropriate in the upstream side of Batu city, East Java Province

Authors

DOI:

https://doi.org/10.22219/jmts.v18i2.12625

Keywords:

Rainfall intensity, Intensity Duration Frequency curve, Sherman formula, Ishiguro formula, Hasper formula

Abstract

Rainfall intensity is an essential input in water resources projects particularly flood, erosion, and landslide. Flash flood occurrence, which had been taken place in the upstream side of study location (upstream side of Batu City), was an impact of landcover change and high rainfall intensity. Flood mitigation needs supporting of high quality of rainfall data. The study has an aim to obtain empirical formula to estimate rainfall intensity and Intensity Duration Frequency (IDF) curve. The empirical formula employed including Sherman, Ishiguro, and Hasper formula, while rainfall intensity design was derived from frequency analysis with varying return period.  Selection of the appropriate formula was conducted by comparing the rainfall intensity from empirical formula with the observed one based on relative error, mean deviation, and Nash Sutcliffe Efficiency (NSE). The result revealed that Sherman formula was the most suitable formula for estimating rainfall intensity that indicated by the small of relative error 6,59%, mean deviation 2,56, and NSE coefficient 0,97. The validation process was carried out by examining the rainfall intensity obtained from the selected formula (Sherman) with the observed one derived from probability analysis. The result confirmed that Sherman formula showed good reliability for estimating rainfall intensity in the study area.

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Published

2020-08-28

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Articles