PERBANDINGAN BEBERAPA METODE HIDROGRAF SATUAN SINTETIK (HSS) PADA DAS SIDUTAN

KUSUMAWARDANI, RR. WIDYAWATI TRESNA (2017) PERBANDINGAN BEBERAPA METODE HIDROGRAF SATUAN SINTETIK (HSS) PADA DAS SIDUTAN. S1 thesis, Universitas Mataram.

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Abstract

Sidutan watershed has 1,687 hectare of productive agriculture area. That area relies on Sidutan River as the main resource of water supply. Therefore, facilities and infrastructure such as irrigation facilities are needed in order to optimize the potential of the area. The design of irrigational facilities requires flood discharge. If the flood discharge data availability is long enough then the flood discharge can be calculated directly by using frequency analysis method, meanwhile if the data availability is limited as in Sidutan River, then the calculation of flood discharge requires synthetic unit hydrograph. Thus, due to the limitation of the data in Sidutan Watershed, then the flood discharge has to be calculated by using synthetic unit hydrograph (HSS). In this research, several HSS were tested and then were checked which HSS is suited to the observed unit hydrograph (HSO). The synthetic unit hydrographs used in this research were Nakayasu method, Gama I, Limantara and ITB-2. Parameter of length and width of the watershed was obtained from topography map, runoff coefficient was obtained from the image of Google Earth. For Gama I method, river slope parameter and the width of the watershed beside the upper course was obtained from topography map. For Limantara method, the length of the river to the closest point with the center of gravity of the watershed was also obtained from topography map. These four methods were compared to the HSO which was obtained by using Collins method. Statistical parameters used to test the suitability were volume of error (VE), correlation coefficient (r) and Nash-Sutcliffe Efficiency (NSE). From the calculation, the peaks of flood discharge for HSS method of Nakayasu, Gama I, Limantara and ITB-2 were 2.267 m3/s, 3.315 m3/s, 1,869 m3/s and 2.949 m3/s respectively, meanwhile HSO Collins method has the largest peak of flood discharge of 2,808 m3/s. Statistical test showed that the ITB-2 has the closest results to HSO method of Collins with the value of statistic parameter of volume of error (VE) = 9,827 %, correlation coefficient (r) = 0,99262, and Nash-Sutcliffe Efficiency (NSE) = 0,98616.

Item Type: Thesis (S1)
Keywords (Kata Kunci): Synthetic unit hydrograph, Sidutan, Nakayasu, Gama I, Limantara, ITB-2
Subjects: T Technology > T Technology (General)
Divisions: Fakultas Teknik
Depositing User: Wiwin Kartikawati
Date Deposited: 16 May 2018 06:08
Last Modified: 16 May 2018 06:08
URI: http://eprints.unram.ac.id/id/eprint/3665

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