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Kustaman Kustaman, Kustaman
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Empirical Model for Calculating the Peak Discharge and The Time Delay of Flood of Synthetic Hydrograph Unit in Sumbawa Soewarno, S; Kustaman, Kustaman
Forum Geografi Vol 13, No 1 (1999)
Publisher : Forum Geografi

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Abstract

This research was carried out in Sumbawa island, it aims to determine: 1) the value of Snyder’s CT and CP coefficient of the synthetic unit hydrograph; 2) the empirical model to estimate of CT and CP coefficient; 3) the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph. Based on rainfall – runoff data, Snyder’s T and CP coefficient of the synthetic unit hydrograph can be derived by syntheti means. The empirical model of CT and CP coefficient can be estimated by using the stepwise method of the multiple regression models. Measurable characteristics of watershed, including watershed area (LDP), length of main river (PSU), slope of watershed (KIM), forest area (LHT), sawah area (LSW), tegal area (LTG), grass area (LRUM), and mean annual rainfall (CHJ) are used to estimate these model. The most appropriate model is selected from a statistical test. Result of analysis show that the model can be used to estimate of Snyder’s CT and CP coefficient. These model can be used to make the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph of ungauged watershed in Sumbawa island.
Potential of Mainstay Debit of Lematang River, South Sumatra for the Regional Planning for Irrigation at Dongku and Modong Syariman, Petrus; Kustaman, Kustaman
Forum Geografi Vol 13, No 1 (1999)
Publisher : Forum Geografi

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Abstract

District Muara Enim, South Sumatra Province has a potential region to develop an agriculture sector especially rice fields. The water resource such as Water Enim and Lamatang River support the capacity of the developing. Acording to the study in 1985 carried out by the BCEOM and Kampsax consultants, the lower Lematang region. Dangku Kiri, Dangku Kanan, and Modong with the total area of about 10.000 Ha has a highly potential to built rice field ith the technical irrigation. Based on the information, research of dependable flow of Lematang River to the irrigation requirement had been carried out by analyzing of all data collecting in those area  such as rainfall, climate, and discharge data. The result shows that the dependable flow of 20% probability of non exceedence is about 65.3 m3/sec. It is potential enough compare with the irrigation requirement of about 1.85 l/sec/ha or 18.5 m3/sec of total irrigation area. Technically, dependable flow of Lematang River is big enough but some constraints will appear especially in determining of free intake or weir because the river gradient is too low and the main  channel has been used by the people for navigation. To increase the accuracy of the research, an Automatic Water Level Recorder and one climatological station should be installed respectively in the alternative I location and in the irrigation area.
Empirical Model for Calculating the Peak Discharge and The Time Delay of Flood of Synthetic Hydrograph Unit in Sumbawa Soewarno, S; Kustaman, Kustaman
Forum Geografi Vol 13, No 1 (1999)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v13i1.463

Abstract

This research was carried out in Sumbawa island, it aims to determine: 1) the value of Snyder’s CT and CP coefficient of the synthetic unit hydrograph; 2) the empirical model to estimate of CT and CP coefficient; 3) the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph. Based on rainfall – runoff data, Snyder’s T and CP coefficient of the synthetic unit hydrograph can be derived by syntheti means. The empirical model of CT and CP coefficient can be estimated by using the stepwise method of the multiple regression models. Measurable characteristics of watershed, including watershed area (LDP), length of main river (PSU), slope of watershed (KIM), forest area (LHT), sawah area (LSW), tegal area (LTG), grass area (LRUM), and mean annual rainfall (CHJ) are used to estimate these model. The most appropriate model is selected from a statistical test. Result of analysis show that the model can be used to estimate of Snyder’s CT and CP coefficient. These model can be used to make the empirical model to estimate the peak flow and time lag of synthetic unit hydrograph of ungauged watershed in Sumbawa island.
Potential of Mainstay Debit of Lematang River, South Sumatra for the Regional Planning for Irrigation at Dongku and Modong Syariman, Petrus; Kustaman, Kustaman
Forum Geografi Vol 13, No 1 (1999)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v13i1.465

Abstract

District Muara Enim, South Sumatra Province has a potential region to develop an agriculture sector especially rice fields. The water resource such as Water Enim and Lamatang River support the capacity of the developing. Acording to the study in 1985 carried out by the BCEOM and Kampsax consultants, the lower Lematang region. Dangku Kiri, Dangku Kanan, and Modong with the total area of about 10.000 Ha has a highly potential to built rice field ith the technical irrigation. Based on the information, research of dependable flow of Lematang River to the irrigation requirement had been carried out by analyzing of all data collecting in those area  such as rainfall, climate, and discharge data. The result shows that the dependable flow of 20% probability of non exceedence is about 65.3 m3/sec. It is potential enough compare with the irrigation requirement of about 1.85 l/sec/ha or 18.5 m3/sec of total irrigation area. Technically, dependable flow of Lematang River is big enough but some constraints will appear especially in determining of free intake or weir because the river gradient is too low and the main  channel has been used by the people for navigation. To increase the accuracy of the research, an Automatic Water Level Recorder and one climatological station should be installed respectively in the alternative I location and in the irrigation area.
Co-Authors Petrus Syariman, Petrus S Soewarno, S