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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Journal La Multiapp
Sobriyah Sobriyah
Magister Teknik Sipil UNS
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering

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Persoalan Proses Kalibrasi Model Perkiraan Banjir Daerah Aliran Sungai Besar Studi Kasus DAS Bengawan Solo Sobriyah, Sobriyah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 12, Nomor 2, Edisi XXIX, JULI 2004
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.954 KB) | DOI: 10.14710/mkts.v12i2.2681

Abstract

Rainfall runoff model with system approach do not interested of the process that happened on the land, but its more interested of the truth of the result which is obtained through calibration. The problem emerge and its  started from the existing data condition. The existing of rainfall data have different range of time and it owning many empty data. The areal precipitation analysis by Thiessen’s methode get difficulty because its polygon fluctuate. For large catchment with some place of Automatic Water Level station, the chosen of streamflow represent the time series of streamflow from the upstream to the downstream. Some gathered data indicate that the upstream hydrograf is high but the downstream hydrograf is low, or on the contrary. Most of Bojonegoro’s hydrograph data has smaller volume than its upstream hydrograph. For the overcome of this problem its used the various method, so that result of calibrating is satisfy Key Words : calibration problem, rainfall-runoff model, large catchment
Semi Cascade Dam Operation for Flood Control at Pacal Dam and Gongseng Dam Zahari, Renalvin; Sobriyah, Sobriyah; Hadiani, Rintis
Journal La Multiapp Vol. 6 No. 4 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i4.2272

Abstract

The existing condition of the Pacal Dam is experiencing swallowing due to sedimentation, resulting in a reduction in storage capacity.The construction of the Gongseng Dam is a solution to this problem.Pacal Dam and Gongseng Dam are semi-cascade dams whose management is an integration of different rivers. Hydrological analysis was carried out to obtain the Inflow hydrograph using the Nakayasu HSS Method using the discharge value at a 500-year return period (Q500). To determine the optimal capacity in flood control, a simulation of the operation of the Pacal Dam gate was carried out using the Level Pool Routing method on each dam. There are four scenarios simulated in the operation of the Pacal Dam spillway gate, namely the gate is completely closed (scenario 1), the gate is opened 50% (scenario 2), the gate is opened 75% (scenario 3), and the gate is fully opened (scenario 4). The simulation results show that in scenario 1 the Pacal dam is not safe, with a maximum outflow discharge value of 72.12 m3/dt with a water level above the spillway of 6.16. In scenarios 2, 3, and 4, the outflow discharge value is 80.39 m3/dt, 113,49 m3/dt, 143,62 m3/dt with water height above the spillway of 2.68 m, 2.37 m, 2.14 m. The results of the simulation of the operation of scenarios 1, 2, 3, and 4 of the Gongseng Dam routing are safe with a maximum outflow discharge value of 260.15 m3/dt, 280,89 m3/dt, 297,90 m3/dt, 319, 38 m3/dt and water height of 1.98 m, 2.08 m, 2.16 m, 2.27 mon spillway landmark. The best scenario is scenario 4 considering the height of the guard water on the spillway.
Simulation of Dungdo Reservoir Water Distribution for Irrigation and Raw Water Pratiwi, Sekar Arum; Sobriyah, Sobriyah; Setyawan, Ary
Journal La Multiapp Vol. 6 No. 4 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i4.2287

Abstract

Small reservoirs are structures that function to accommodate excess water during the rainy season so that it can be used during the dry season. Dungdo Reservoir is expected to help meet the needs of irrigation water and raw water for livestock in the surrounding community. Water distribution simulation aims to optimize water availability efficiently and evenly. The methodology used includes water balance analysis based on rainfall data, evapotranspiration, inflow, and changes in reservoir capacity. Irrigation water requirements are calculated based on the crop coefficient (Kc), while raw water requirements are calculated based on the number of livestock. Based on the simulation results with the existing planting pattern with an irrigation area of 171.60 Ha, it shows that the average water requirement is 279605.66 m3/15 days, while the reservoir's capacity to provide water is 53135.20 m3/15 days. The simulation results show that Dungdo Reservoir has not been able to optimally meet irrigation water and raw water needs.
Co-Authors Adijaya, Surya Agus Hari Wahyudi Agus Suryono Angga Safrida, Muhammad Fajar Angga Safrida, Muhammad Fajar Ardiansyah, Rahman Hakim Ariansyah, Gathot Bayu Aritonang, Ribur Aritonang, Ribur Arviana, Irena Dwi Ary Setyawan Azhari, Dony Baniva, Ratih Cahyono Ikhsan Ery Suryo Kusumo Hadiani, Rr. Rintis Hartomo, Christianto Hartomo, Christianto Indra Setiawan, Aditya Rully Irawan, Fredi Iwan Joko Sulomo kurniasari, apriliana Kurniawan, Rizki Putro Kurniawan, Rizki Putro Mahadika, Bagas Mamok Suprapto Muttaqien, Adi Yusuf Muttaqien, Adi Yusuf Naulita, Maria Anisa Naulita, Maria Anisa Nugraheni, Aprillya Pratiwi, Sekar Arum Rahmani, Rosadana Nurir Saptaji Adinata, Briberliant Kurnia Sari, Rica Purnomo setiono setiono Siti Qomariyah Susilowati Susilowati Syifa Fauziyah, Syifa Tias Pratomo, Muhamad Iqbal Victorianto, Edho Wibowo, Andre Widi Hartono Widi Hartono Winditiatama, Sedewa Wulandari, Rut Desi Yudhistira, Umbu Damar Yulianto, Mochamad Zakky Yullius Heryant, Yullius Yunanto, Idham Zahari, Renalvin