Browsing by Author "Sujatmoko Bambang"

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    PERHITUNGAN INDEKS KEKERINGAN MENGGUNAKAN TEORI RUN PADA DAERAH ALIRAN SUNGAI (DAS) INDRAGIRI
    (2012-10-30) Ersyidarfia, Novreta; Fauzi Manyuk; Sujatmoko Bambang
    Drought problem becomes a routine thing that occurred in Indonesia, but the prevention and control of this case is very slow, so it becomes unresolved issues. The problem occurs is the lack of data indicating the level of drought in the region. Therefor, by using the rainfall data in Indragiri watershed, we can obtain an index of drought. Drought index can be used to indicate the drought in the rainfall data series such as drought duration and amount of drought by using the Run Theory. The data used are 25-years rainfall data of Air Molek, Pangkalan Kasai, Sentajo, and Talang Jerinjing Station and 15-years rainfall data of Air Molek, Pangkalan Kasai, Sentajo, Talang Jerinjing, Lirik, Sijunjung, Tembilahan, and Usul Station. The time period used are monthly, 15 daily, 10 daily, and weekly. Rainfall station experienced the highest drought duration and amount of drought for 25 years rainfall data was Air Molek Station, while the lowest was Talang Jerinjing Station. For 15 years rainfall data, the highest and the lowest drought duration for each period of time were in different stations, while the highest amount of drought was in Pangkalan Kasai Station and the lowest amount of drought was in Talang Jerinjing Station. The description of drought duration value and the amount of drought could be found with Golden Surfer 8.0 software. The description of isohyet method between using four rainfall stations and eight rainfall stations shows that the differences in contour value are not very significant.
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    STUDI PENANGGULANGAN BANJIR PADA SUNGAI RETIH KECAMATAN KEMUNING INDRAGIRI HILIR
    (2013-01-09) Irwandi, Dedy; Sujatmoko Bambang; Trimaijon
    Retih River is one of the rivers that comes across Kemuning Sector where flood usually takes place every year. The study of flood prevention and tackling on Retih River has objectives to know the main cause of flood and to find out the alternative ways to prevent and tackle the flood. Flood analysis runs with analyzing the river capacity and comparing it with the discharge calculated by using Nakayasu method. The analysis of Retih River capacity was calculated by using HEC-RAS 4.1.0 software. Rain input was calculated based on two years time period, twenty five years time period and fifty years time period. Profile analysis performed on the existing condition and the plan condition. Research findings show that the area of Retih River that is usually struck by flood is the area where the research performed. On existing condition for the debt of two years time period, the maximum depth is 1.59 meters. The flood occurred because of bottle neck constriction is more dominant than the meander. It was proved by the result of the analysis by using HEC-RAS for two years time period, with 8 meters river width normalization, 0.0002 channel declivity and bank declivity (talud) V(1):H(0.5) is decreased 100% from the maximum flood height. By creating waterway diversion on the meander, it will give effect of flood deficiency only about 1.26% from the maximum flood height. So, the effective flood prevention and tackling effort on Retih River is by applying the river normalization.