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All Journal TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL JURNAL KARYA TEKNIK SIPIL REKAYASA Jurnal Teknik Sipil Rang Teknik Journal Borneo Engineering : Jurnal Teknik Sipil JURNAL TEKNIK HIDRAULIK
Sri Sangkawati Sachro
Departemen T. Sipil FT. UNDIP Jl. Prof. H. Soedarto SH., Tembalang, Semarang 50275
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Physics

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Studi Pendapat Publik dalam Penganggaran Operasi, Pemeliharaan dan Manajemen Sumber Daya Air Sachro, Sri Sangkawati
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.539 KB)

Abstract

Abstrak. Hubungan antara anggaran Operasi, Pemeliharaan dan Manajemen (OP&M) dengan kemampuan system sumber daya air untuk mencapai kinerja yang tinggi sudah menjadi perhatian dalam pengelolaan sumber daya air. Pada saat ada keterbatasan dana, maka akan mengakibatkan satu atau beberapa kegiatan tidak dapat dikerjakan, dan pengelola harus memilih prioritas kegiatan OP&M. Pengelola mempunyai pertimbangan masing-masing di dalam menentukan prioritas kegiatan tersebut. Salah satu sumber dana untuk pengelolaan sumber daya air adalah biaya jasa pengelolaan sumber daya air (BJP-SDA), yaitu biaya kontribusi dari para penerima manfaat, sehingga diperlukan identifikasi penerima manfaat dan faktor-faktor pengaruh kecukupan dana OP&M. Identifikasi dilakukan melalui pendapat publik yaitu penilaian obyektif dari pakar pengelolaan sumber daya air melalui kuesener.Kuesioner ini menyoroti dan menyelidikai rincian biaya OP&M, prioritas kegiatan dan biaya jasa pengelolaan sumber daya air. Berdasarkan identifikasi terhadap penerima manfaat yang diharapkan ikut menanggung biaya pengelolaan sumber daya air dapat disimpulkan bahwa: pihak-pihak yang berkepentingan dalam pengelolaan sumber daya air sudah memahami bahwa biaya menjadi tanggung jawab bersama.Abstract. The relation between Operation, Maintanance and Management OM&M funding and the ability of water resources system to achieve high performance became attention in water-resources management. When there is fund limitation, one or some activities can not be conducted, and organizer must selects activity priority of OM&M. Every organizer have consideration by it self in determining activity priority. One of the fund sources for the water resources management is the service cost of water resources management, that is contribution expense from beneficiaries, then identification of beneficiaries and influence factors to fund sufficiency OM&M are needed. Identification through public opinion, that is objective assessment of water resource management expert by giving questionnaires. This questionnaires was to highlight and investigate the breakdown of OM&M expenditure, expenditure priorities, service charge. Base on the identification toward beneficaries who are expected to cover the water resources management cost, it can be summarized that other parties who have an interest in water resources management have already understood that the cost is a collective responsibility.
Penggunaan Analisis Dimensi untuk Mencari Korelasi Antar Variabel pada Uji Model Hidrolik Atmojo, Pranoto Samto; Sachro, Sri Sangkawati; Budieny, Hary
Jurnal Teknik Sipil Vol 21, No 3 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (586.522 KB)

Abstract

Abstrak. Dalam penelitian pemodelan, perumusan korelasi antara satu variabel dengan kelompok variabel lain dapat diselesaikan dengan analisis dimensi atau statistik. Analisis dimensi dalam hal tertentu akan lebih mudah dan relatif cepat untuk mengetahui hasilnya. Ada beberapa metode analisis dimensi yang sering digunakan, antara lain Metode Buckingham, Indicial, dan matrix. Tulisan berikut akan menggunakan analisis dimensi metoda Buckingham’s untuk menentukan korelasi konsentrasi sedimen yang tergerus (C) dan kelompok variabel lain (Hw, g, ρw, Qw, Hs, ds, ρs , v) pada model penggelontoran sedimen. Berikutnya akan dapat diketahui korelasi konsentrasi sedimen maksimum hasil penggelontoran terhadap tinggi muka air hulu pada setiap tebal sedimen (d) yang telah mengendap.Pemodelan dengan skala 1:66,67, menggunakan sedimen tiruan serbuk batubara. Tebal sedimen yang mengendap diasumsikan 1,5; 2,25; 3,00; 3,75; 4,50 cm. Pengukuran konsentrasi yang tergelontor pada saat setiap muka air turun 1,50 cm dari tinggi muka air awal 13,90 cm. Hasil analisis didapat korelasi: C / ρ s = ƒ( Qw.v / H3 w . ɡ), dan konsentrasi sedimen maksimum hasil penggelontoran setiap tebal endapan didapat pada ketinggian muka air : Hw = 10,58 Hs-0,12HwAbstract. In the modeling research, the correlation formulation between one variable to a group of other variables can be solved by dimensional analysis or statistics. Dimensional analysis would be easy and relatively quick to obtain results in the certain cases. There are several methods of analysis dimensions that are often used, among other methods are Buckingham’s, Indicial, and matrix. The following article will use the dimensional analysis Buckingham’s method to determine the correlation of flushed sediment concentration (C) and a group of other variables (HW , g , ρw , QW , Hs , ds , ρs , v) in the flushed sediment modeling. The next step its will be known correlation maximum concentration of sediment flushed results against upstream water level at each sediment thickness (d) which has been deposited. Modeling scale of 1 : 66.67, use sediment artificial with coal dust. The thickness of sediment that settles at the assumed 1.5 ; 2.25 ; 3.00 ; 3.75 ; 4.50 cm. The flushed sediment concentration measurements were conducted during the upstream water level every drop of 1.50 cm, from the initial water level 13.90 cm. The results of the analysis correlation can be obtained : C / ρ s = ƒ( Qw.v / H3 w . ɡ), and the maximum concentration of flushed every sediment thickness can be obtained at water level : Hw = 10,58 Hs-0,12Hw
PERBANDINGAN EFEKTIFITAS HASIL PENGGELONTORAN SEDIMEN DI WADUK CARA FLUSHING DAN SLUICING Atmodjo, Pranoto S.; Sangkawati, Sri; Kirno, Kirno
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.83 KB) | DOI: 10.14710/teknik.v34i2.5627

Abstract

This study compares the effectiveness of the flushing of sediment in the reservoir by means of flushing andSluicing way, based on Physical Hydraulic Test (Model Test) in the laboratory. Flushing is removingaccumulated deposited sediment. While slucing is releasing of sediment through the reservoir beforesettled or keep sediment remain in suspension and its occur during flood period. Sediments FlushEffectiveness represented by the percentage of released sediment by sediment deposited or the amount ofsediment entering the reservoir during the flushing period.The model based on the prototipe from DetailDesign of Structural Countermeasures for Sedimentation on Wonogiri Reservoir by Nippon Koei 2009.Running model duration is one hour, used free flow and submergence condition, with discharge variationQ=100, 200 and 400 m3/s. Sluicing experiments conducted with some 60 liters of sediment sprinkle evenlywide flow, and Flushing implemented by 2,00 m thickness of deposited sediment that spreaded over thereservoir bottom before running. From this research showed that Sluicing way more efficient than theflushing way, where the number of efficiency of sediment Sluicing way bigger than the efficiency offlusing way, in the running an hour in the laboratory test
Perkiraan Koefisien-koefisien Karakteristik Daerah Aliran Sungai Krengseng untuk Membangun Kurva-Durasi Debit Sachro, Sri Sangkawati; Sugiyanto, Sugiyanto; Budieny, Hary
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 1, JULI 2013
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (554.341 KB) | DOI: 10.14710/mkts.v19i1.7831

Abstract

The flow-duration curve at a site is most useful tool for evaluating flows in water resources development projects. Flow-duration curves are based on cotinuous stream flow data, where stream flow meuserements are not available, precipitation and potensial evapotranspiration records can be used to calculate continuous flows. Calculation of monthly flows from meteorologic data are based on the water balance in watershed. The water balance equation is Precipitation – Actual evapotranspiration + Storage = Runoff. This calculation use coefficients that represent watershed characteristics, that will change from one watershed to another. The watershed characteristic coefficients changes will correlate with changes in vegetation, soils, and subsurface geology. This study is an attempt to estimate the watershed characteristic coefficients to calculate monthly streamflows in Krengseng River at Diponegoro Dam site. The  watershed characteristic coefficients analysis using F.J.Mock Model and NRECA Model. Resuls of watershed characteristic coefficients  analysis using F.J.Mock are, Expose surface, m = 50%, Soil moisture capacity, SMC = 200 mm, Infiltration factor, IF = 0.45, Recesion coeffisien, RC =0.70. Watershed characteristic coefficients using Model NRECA are, Index soil moisture capacity, Nominal:100+(0.25xmean annual precipitation), Base flow parameter, PSUB = 0.30 and Index groundwater storage, GWF=0.50.
Analisis Prioritas Pembangunan Embung Metode Cluster Analysis, AHP dan Weighted Average (Studi Kasus: Embung di Kabupaten Semarang) Anjasmoro, Bima; Suharyanto, Suharyanto; Sangkawati, Sri
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 21, Nomor 2, DESEMBER 2015
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2263.758 KB) | DOI: 10.14710/mkts.v21i2.11236

Abstract

The Feasibility study potential of small dams in Semarang District has identified 8 (eight) urgent potential small dams. These potential dams here to be constructed within 5 (five) years in order to overcome the problem of water shortage in the district. However, the government has limited funding source. It is necessary to select the more urgent small dams to be constructed within the limited budget. The purpose of the research is determining the priority of small dams construction in Semarang District. The method used to determine the priority in this study is cluster analysis, AHP and weighted average method. The criteria used to determine the priority in this study consist of: vegetation in the inundated area, volume of embankment, land acquisition area, useful storage, recervoir life time, water cost/m³, access road to the dam site, land status at abutment and inundated area, construction cost, operation and maintenance cost, irrigation service area and raw water benefit. Based on results of cluster analysis, AHP and weighted average method can be conclude that the priority of small dams construction is 1) Mluweh Small Dam (0.165), 2) Pakis Small Dam (0.142), 3) Lebak Small Dam (0.134), 4) Dadapayam Small Dam (0.128), 5) Gogodalem Small Dam (0.119), 6) Kandangan Small Dam (0.114), 7) Ngrawan Small Dam (0.102) and 8) Jatikurung Small Dam (0.096). Based on analysis of the order of priority of 3 (three) method showed that method is more detail than cluster analysis method and weighted average method, because the result of AHP method is closer to the conditions of each dam in the field.
Korelasi Klasifikasi Penutup Lahan dengan Debit Puncak di Daerah Aliran Sungai Sachro, Sri Sangkawati; Edhisono, Sutarto; Atmodjo, Pranoto Samto; Prasetyo, Wahyu
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 23, Nomor 2, DESEMBER 2017
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (798.912 KB) | DOI: 10.14710/mkts.v23i2.16687

Abstract

Many studies have shown that land use changes in watersheds such as forests that convert to settlements, industrial and estates, have an impact on flooding. So it is important to know the correlation between the various land use changes to the discharge within a watershed. This study is a preliminary study in an attempt to assess the correlation between land cover index and peak discharge, with case studies in the Beringin River Basin.The peak discharge with the return period of 2, 5, 10, 20, 50 and 100 years are computed with HEC-HMS software, developed by Hydrologic Engineering Centre (HEC) and US Army Corps of Engineers which computes the runoff discharge from the precipitation. As for land covered index (LCI), it is defined as the sum of the land-use index (LUI). The result of the case study shows the strong correlation between the land covered index with the the runoff discharge with such relation : Q100 = -22.42LCI2 + 214.30LCI - 10.62, Q50 = -18.33LCI2 + 181.87LCI - 20.19, Q20 = -14.30LCI2 + 145.27LCI - 15.61, Q10 = -11.36LCI2 + 118.41LCI - 12.29, Q5 = -8.42LCI2 + 91.27LCI - 8.9 and Q2 = -4.44LCI2 + 53.54LCI - 4.5.
Osilasi Dalam Tangki Pendatar (Surge - Tank) Akibat Penutupan Turbin Secara Mendadak Sangkawati, Sri
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 13, Nomor 2, Edisi XXXII, JUNI 2005
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (466.758 KB) | DOI: 10.14710/mkts.v13i2.3916

Abstract

Surge tank in hydro-power generation plant is placed on the transition between conveyance pipe channel and chute pipe. The dimension of surge tank is designed based on water mass oscillation result in minimum hydrodynamic pressure, such that it can determine form, type, and configuration of the tank. The sudden increase in hydrodynamic pressure (positive water hammer) is caused by abrupt decrease in water discharge to the turbine to reduce load to the generator. This positive water hammer is dependent on the discharge and time of closure of the valve. Mathematical equation that describes mass oscillation in the reservoir-pipe channel-surge tank is dynamic and solution can be easily using numerical techniques. This paper demonstrates the water hammer oscillation in a surge tank. The result shares that, 1) when the ratio between surge tank area (As) to the pipe area (AT), As/AT below 5, the maximum increase in water pressure is significant, ii) when the ratio As/AT greater than 5, the increase in water pressure is not significant and tends to have slight differences. Key Words : surge-tank, mass oscillationsPermalink: http://ejournal.undip.ac.id/index.php/mkts/article/view/3916[How to cite: Sangkawati, S., 2005, Osilasi  Dalam Tangki Pendatar (Surge - Tank) Akibat Penutupan Turbin Secara Mendadak, Jurnal Media Komunikasi Teknik Sipil, Volume 13, Nomor 2, pp. 122-129]
Unjuk Kerja Waduk Jatigede Cholifatul Afifah, Risdiana; Samto Atmodjo, Pranoto; Sangkawati, Sri
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 21, Nomor 2, DESEMBER 2015
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1447.107 KB) | DOI: 10.14710/mkts.v21i2.11232

Abstract

Jatigede Reservoir located in Sumedang, West Java. As the second largest reservoir in Indonesia, the main purpose of the reservoir construction is to irrigate the 90.000 Ha of irrigation area, the source of 3,5 m3/s of raw and drinking water, as well as the source of water for hydropower plan Jatigede requiring water supply as much as 61,84 m3/s. One of the efforts that can be taken to optimize reservoir of water resources, particularly for irrigation water needs, is to do a simulation model of the Jatigede Reservoir operation. This study is discusses the analysis of the performance of the operating pattern Jatigede were analyzed based on the stochastic model of Cimanuk river flow and rain data of Cimanuk Water District. Data needs to be tested first to qualify for a normal statistical distribution using AProb software version 4.1. Stochastic models were analyzed with software SAMS 2007 from Colorado State University. Surgery simulation analysis to determine the performance of the reservoir using software Ribasim. To test the performance of reservoir used the criteria of reliability, resilience, and vulnerability. From the analysis of performance can be concluded that the reliability of the reservoir in an effort to meet the needs of raw water, irrigation, and hydropower at existing condition is of 98.3%, the resilience of the reservoir by 50%, and the vulnerability of dams throughout the simulation period amounted to 6824.70 m3/s , While in the next 50 years the condition of the dam by 92.7% reliability, resilience reservoir by 34%, and the vulnerability of dams throughout the simulation period amounted 20.540,51m3/s. It can be concluded that the performance of  Jatigede reservoir decreased after the analysis of reservoir operation plan for the next 50 years.
Pembangkitan Data Debit dan Skenario Pola Tanam Daerah Irigasi Embung Suruhan Pratiwi, Bertha Silvia; Sachro, Sri Sangkawati; Suharyanto, Suharyanto
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 23, Nomor 1, JULI 2017
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (491.821 KB) | DOI: 10.14710/mkts.v23i1.13805

Abstract

The availability of historical data used in hydrological analysis is often incomplete and very short, so the information obtained from the data is also very little. If continue to use incomplete historical data or a little period of time, the analysis results will not match the circumstances in the field. Hydrology analysis in planning of Embung Suruhan uses rainfall data from Jiken Station, Blora Station and Bogorejo Station from 1986-2006 and climatology data of Tempuran Reservoir Station 1986-2005 with 4.6 million m3. The next study, capacity 6.69 million m3 with rainfall data from five stations, namely: Blora station, Jiken, Gayam, Greneng, and Tempuran from 1997-2012 and climatological data of Tempuran Reservoir and Kedung Ombo Reservoir. This research is to get the requirement of optimal irrigation with forecasting of discharge data and simulation of initial variation of planting and some scenario type of planting pattern from Embung Suruhan. Discharge was analyzed by Mock method and then raised up to 25 years with Thomas Fiering model and to get the water availability used Basic Year. The discharge data has characteristics that are close to historical data and in 2018 as the basic year used for water availability.
Analisis Efektivitas Jalur Evakuasi Bencana Banjir Samto Atmodjo, Pranoto; Sangkawati, Sri; Bayu Setiaji, Arief
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 21, Nomor 1, JULI 2015
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2799.405 KB) | DOI: 10.14710/mkts.v21i1.11228

Abstract

The flood disaster is one of the natural phenomena that are difficult to avoid. The risk of flood losses that occur in urban areas is generally greater than that occur in the countryside, which it is more due to the differences in the level of public welfare facilities and population density factors The increase in population and the high cost of residential land in urban areas, the greater the pressure of land use for settlement penetrated even in areas that have the potential to floodwaters. To avoid big losses due to flooding and loss of life, it is necessary to disaster management which includes the establishment of alternative evacuation routes, the storage location of refugee. This study will analyze and choose the path of evacuation of the population that are effective and safe as a result of flood-based Geographic Information System (GIS). Stages study began with an analysis of the magnitude of flooding, inundation extents, data collection and analysis of population, density and location of concentrations of residential quarters, global topography and the existing road network system. The study used a case in West Semarang Regency, with a fairly dense population and prone to flooding. Results of this study are expected to be applied to the area of research and can be used as a model for the evacuation of residents due to floods elsewhere.
Co-Authors Afiff Faiq Hakim Harahap Andin Cipto Nugroho Andin Cipto Nugroho, Andin Cipto Arief Bayu Setiaji, Arief Atmodjo, Pranoto Samto Azkira Nur Auzan Bertha Silvia Pratiwi, Bertha Silvia Bima Anjasmoro, Bima Dwi Kurniani Dwi Kurniani Dyah Ari Wulandari Fadhlul Rahman Faisal Nurrohman Firman Hasiholan Fitria Sofi Choirunisa Hanny Hafiar Hary Budieny Hasan Mudhofar Hasan Mudhofar, Hasan Hayu Rahayu Ivanna Susanto Iwan K. Hadihardaja Joetata Hadihardaja Kirno Kirno Kresno Wikan Sadono M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Mayasari Mayasari Mohammad Faqih Murdiani, Kiki Marina Pranoto S. Atmodjo Pranoto Samto Admodjo Pranoto Samto Atmodjo Pranoto Samto Atmojo Pranoto Samto Atmojo Recha Resnandi Raka Riris Dwi Astuti Risdiana Cholifatul Afifah, Risdiana Ruzika Habib Satria Waskita Eka Paksi Septina Qurniawati Siswanto Siswanto Siwu, Wulandari Pingkan Sriyana Sriyana Sriyana, Ignatius Sugiyanto Sugiyanto Suharyanto Suharyanto Suprapto Suprapto Sutarto Edhisono Wahyu Prasetyo Yohanna Fabiola Pane Yulia Ananda Putri