ANALISIS CURAH HUJAN UNTUK PENDUGAAN DEBIT PUNCAK DENGAN METODE MELCHIOR PADA SUB- DAS BENGKULU HILIR SUNGAI AIR BENGKULU

Indarti, Yosi and Khairul , Amri and Mawardi, Mawardi (2012) ANALISIS CURAH HUJAN UNTUK PENDUGAAN DEBIT PUNCAK DENGAN METODE MELCHIOR PADA SUB- DAS BENGKULU HILIR SUNGAI AIR BENGKULU. Undergraduated thesis, Fakultas Teknik UNIB.

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Abstract

This research aimed to determined how large the peak discharge which be occured in the downstream of Sub DAS Bengkulu based on various continuously periods of the rain design by using Rational Method of Melchior. Rainfall analysis by this method was an hydrology analysis with statistical analysis. Estimation of optimum debit in this way used daily rainfall data for 32 years to be analyzed in stages starting from determining the average of maximum daily rainfall by using partial method, then calculated the statistical parameters, selected the appropriate type of frequency distribution, distribution and rain design test, and run off coefficient until the value of time concentration was obtained. The results of this research showed that the distribution system which compatible with the rainfall data was log normal distribution. While the data of land arrangement and using, and characteristics of the Sub DAS obtained run off coefficient value (α) of 0,38016, so by the results of research that the runoff coefficient value in the downstream of Sub DAS Bengkulu was 138,5785 m3/second, with the time concentration of 19,126 hours on an area of 224,026 km2 for 2 years period.

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