ANALISIS INTENSITY-DURATION-FREQUENCY KEJADIAN HUJAN DI KABUPATEN BANJARNEGARA
Abstract: Rainfall is the most
important input component in the hydrologic process. Rainfall characteristic,
which are intensity, duration, depth, and frequency. Intensity that is related
to duration and frequency can be expressed by Intensity-Duration-Frequency (IDF)
curve. IDF curve can be used to calculate floods design using by rational
method. The objective of the research is to create IDF curve on flood prone
area on Banjarnegara regency. In this study, daily rainfall depth was
calculated by frequency analysis, which was started by determining the daily
maximum mean rainfall, followed by calculated statistical parameter to choose
the best distribution. Intensity could be calculated by Mononobe method. The
result of this study indicated that the Log Normal distribution fit to most of
data. The rainfall design for time periods 2, 5, 10, 15, 20, 25, 30, 40, 50 and
100 year are 116.3, 131.5, 140.2, 144.8, 147.8, 150.1, 151.9, 154.8, 156.9, dan
163.3 mm. The highly intensity of ranfall must be happen on short duration, but
the lowly intensity of ranfall must be happen on long duration.
Penulis: Suroso
Kode Jurnal: jptindustridd060057