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All Journal Civil Engineering Forum Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Ilmiah Desain & Konstruksi Jurnal Teknik Pengairan: Journal of Water Resources Engineering agriTECH Semesta Teknika Teknisia Jurnal Teknik Sipil Info-Teknik Journal of the Civil Engineering Forum Simposium II UNIID 2017 Inersia : Jurnal Teknik Sipil Spektrum Sipil Lowland Technology International Journal of the Civil Engineering Forum Jurnal Teknik Sumber Daya Air Prosiding Seminar Nasional Teknik Sipil UMS Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Jurnal Geografi LIngkungan Tropik (Journal of Geography of Tropical Environments) REKAYASA DAN INOVASI TEKNIK SIPIL
Rachmad Jayadi
Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Environmental Science Transportation

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Journal : Journal of the Civil Engineering Forum

 1 
COMPEREHENSIVE TECHNICAL STUDIES OF FLOOD CONTROL OVER SOLO CITY AREA (CASE STUDY IN DEMANGAN BARRAGE) Ali Trusharyanto; Rachmad Jayadi; Darmanto Darmanto
Journal of the Civil Engineering Forum VOLUME: XXII/3 - SEPTEMBER 2013
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.18903

Abstract

City of Surakarta, known as Solo City is one of cities in Central Java Province traversed by Bengawan Solo River. Heavy rainfall in upstream area of Bengawan Solo River causes increase in high water level at downstream. Bengawan Solo River will be higher than water level in drainage system which may induce a backwater flow. Since Colonization era, the government has built dikes and barrages against backwater flow and inundation problem. One of the barrages was Demangan Barrage dividing river flow into Bengawan Solo River and Pepe River. It was equipped with total capacity pump of 12,3 m3/s. The inundation is not only caused by the backwater flow coming from Bengawan Solo River, but also surface runoff as the result of the excess rainfall which cannot be drained gravitationally to the main river if the gate was closed. Therefore, comprehensive study combining hydrology and hydraulics analysis is highly needed in order to achieve more effective flood control management.Hydrology analysis was done to estimate the direct runoff hydrograph from catchment area in Solo City to downstream of Pepe River. While in hydraulics case, hydraulic parameter in downstream of Pepe River influenced by Bengawan Solo River stream was analyzed. Both studies were simulated using software HEC-RAS 4.1.0 version. The simulation considered drainage channel, gate, pump system and dike in Pepe River downstream.Simulation using 10 years of return period in Solo City and average annual water level in Bengawan Solo River showed that Pepe River can flow through the gate, while the highest water level is still below the dike. Simulation considering 10 years of return period, water level hydrograph of Bengawan Solo River, existing pump, and gate operation inferred that Pepe River surpassed top of dike. Capacity of required pump should be more than 168,3 m3/s in order to pass 10 years of return period. By combining operational of existing pump and dike elevated up to +87,63 m, capacity of required pump became lesser which was approximately 120,3 m3/s. Simulation of HEC-RAS conducted by operating pump automatically on critical elevation without heightened dike obtained the total capacity of pump was 132,3 m3/s.Keywords: barrage, pump operation, Bengawan Solo River, flood control management.
Unit Hydrograph Modeling using Geomorphological Instantaneous Unit Hydrograph (GIUH) Method Anantri Sulistyowati; Rachmad Jayadi; Adam Pamudji Rahardjo
Journal of the Civil Engineering Forum Vol. 4 No. 3 (September 2018)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (733.505 KB) | DOI: 10.22146/jcef.38860

Abstract

Flood forecasting at Wonogiri Reservoir is restricted on the availability of hydrologic data due to limited monitoring gauges. This issue triggers study of unit hydrograph modeling using Geomorphological Instantaneous Unit Hydrograph (GIUH) which is based on Geographic Information System (GIS). Analysis of physical watershed parameters was conducted on Digital Elevation Model (DEM) data using software Watershed Modeling System (WMS) 10.1 and ArcGIS. Nash model and S-curve method were used to process triangular GIUH into hourly Instantaneous Unit Hydrograph (IUH) and Unit Hydrograph (UH) and then was compared with the observed UH of Collins method. A sensitivity analysis was conducted on parameter of RL and Nash-model k. Evaluation of accuracy of the simulated GIUH runoff hydrograph was also conducted. The GIUH model generated UH with smaller peak discharge Qp, also slower and longer of tp and tb values than the observed UH. Accuracy test of the simulated GIUH runoff hydrograph using Nash-Sutcliffe Efficiency (NSE) shows that Keduang watershed gives a satisfying result, while Wiroko watershed gives less satisfactory result. The inaccuracies occur due to limited flood events used to derive the observed UH and stream tributaries that were not properly modeled based on Strahler method.
Correcting Radar Rainfall Estimates Based on Ground Elevation Function Roby Hambali; Djoko Legono; Rachmad Jayadi
Journal of the Civil Engineering Forum Vol. 5 No. 3 (September 2019)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1035.983 KB) | DOI: 10.22146/jcef.49395

Abstract

X-band radar gives several advantages for quantitative rainfall estimation, involving higher spatial and temporal resolution, also the ability to reduce attenuation effects and hardware calibration errors. However, the estimates error due to attenuation in heavy rainfall condition cannot be avoided. In the mountainous region, the impact of topography is considered to contribute to radar rainfall estimates error. To have more reliable estimated radar rainfall to be used in various applications, a rainfall estimates correction needs to be applied. This paper discusses evaluation and correction techniques for radar rainfall estimates based on ground elevation function. The G/R ratio is used as a primary method in the correction process. The novel approach proposed in this study is the use of correction factor derived from the relationship between Log (G/R) parameter and elevation difference between radar and rain gauge stations. A total of 4590 pairs of rainfall data from X-band MP radar and 15 rain gauge stations in the Mt. Merapi region were used in evaluation and correction process. The results show the correction method based on the elevation function is relatively good in correcting radar rainfall depth with values of Log (G/R) decreased up to 81.1%, particularly for light rainfall (≤ 20 mm/hour) condition. Also, the method is simple to apply in a real-time system.
Evaluation of Reservoir Capacity and Reliability for Urban Water Utilization in Dili, Timor Leste Aderita Mariana Takeleb; Joko Sujono; Rachmad Jayadi
Journal of the Civil Engineering Forum Vol. 7 No. 2 (May 2021)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.58538

Abstract

The ability to store and distribute water resources is very significant to human activities. Therefore, high importance is placed on the sector to address any adverse impact in the event of major shortfall, particularly in Dili, Timor Leste. A study on the development of effective water resource management mechanisms has been conducted to support government visions. As a consequence, priority strategy was initiated to design the necessary infrastructure, in order to match urban demands. One action plan of this effort is by building reservoirs. The purpose of this study was to evaluate the construction of a minor or large reservoir to meet water consumption rate in Dili. Also, the strategy implementation proposal of the reservoir development in Beemos and Becora rivers was prepared by analyzing the reliability and capacity, using a model known as water release standard operating rules. However, water balance simulation results showed the reliability of clean water services from these two small storage units is unable to approach 100%, due to limited volume. The capacity optimization outcomes of large Beemos reservoir indicated the inflow potential at 90% utilization, and therefore is able to balance the urban water demand up to 2030. Despite impressive simulation results, the government is expected to consistently conduct a detailed feasibility study in the upstream area, prior to implementation. Furthermore, large reservoir construction is highly recommended for effective water resource expansion, in an attempt to match the high consumption rate in Dili. This effort possibly supports Timor Leste's targets and sustainable development goals concerning clean water and sanitation.
Co-Authors Adam Pamudji Rahardjo Adam Pamudji Rahardjo Aderita Mariana Takeleb Ahmad Hakim Bintang Kuncoro Ahmad Rifa’i Ahmad Rifa’I Ali Trusharyanto Aminullah, Akhmad Anantri Sulistyowati Anggi Nidya Sari Anggraheni, Dinia Bambang A. Kironoto Bambang Agus Kironoto Bambang Kuncoro Hari Bambang Triatmodjo Bambang Trihatmodjo, Bambang Bayu Krisna Wisnulingga Benjamin J.B. Nanlohy C. Lestari Saptarini N. Darajat, Achmad Rafi’ud Darmanto Darmanto Djoko Legono Endita Prima Ari Pratiwi Endita Prima Ari Pratiwi Fatchan Nurrochmad Fransisca Natania Karina Rediasti Goyu Ismoyojati Hadthya, Reinhart Henggar Risa Destania Heriantono Waluyadi Hesti Subiyanti Hesti Subiyanti, Hesti INTAN SUPRABA Ismoyojati, Goyu Istiarto Istiarto Istiarto Istiarto Istiarto Istiarto Istiarto Joko Sujono Joko Sujono Joko Sujono Joko Sujono Joko Sujono Joko Sujono Kabul Basah Suryolelono Kabul Basah Suryolelono Kamil, Insanul Koichiro Ohgushi Kurniawan Putra Santoso Lidwina Putri Astani Lukman Hidayat Lukman Hidayat Murtiningrum Murtiningrum Pamungkas, Yusuf Aji Putu Sudira Putu Sudira Putu Sudira Roby Hambali Sahid Susanto Santoso, Kurniawan Putra Sardi Sardi Sri Haryanti Sri Haryanti Sudjarwadi Sudjarwadi Triyoso, Christopher Wignyosukarto, Budi Santoso Yakubson Yohana Lilis Handayani Yotam Adiel Haryanto Yusuf Aji Pamungkas