- Professor in HydrologySince 1987 as a lecturer in the Department of Water Resources, Faculty of Engineering, Universi... moreProfessor in HydrologySince 1987 as a lecturer in the Department of Water Resources, Faculty of Engineering, University of Brawijaya, Malang-IndonesiaNow I am as the Head of Doctoral Program in the Department of Water Resourcesedit
ABSTRAK: Kota Balikpapan terletak di bagian selatan Propinsi Kalimantan Timur, dengan luas sekitar 503,30 Km 2 . Kondisi saat ini menunjukkan kota Balikpapan terus berkembang, bergerak dari daerah hilir menuju ke hulu. Namun disayangkan... more
ABSTRAK: Kota Balikpapan terletak di bagian selatan Propinsi Kalimantan Timur, dengan luas sekitar 503,30 Km 2 . Kondisi saat ini menunjukkan kota Balikpapan terus berkembang, bergerak dari daerah hilir menuju ke hulu. Namun disayangkan kondisi infrastruktur yang ada belum memadai, sehingga pada beberapa tahun terakhir ini Kota Balikpapan sering kali banjir. Dibutuhkan upaya pengendalian banjir, kolam retensi dirasa sebagai pemecahan masalah terbaik guna mereduksi banjir yang terjadi. Pada studi ini, dilakukan analisa hidrologi untuk mendapatkan debit banjir rancangan pada lokasi studi. Selanjutnya dilakukan analisa hidrolika guna mengetahui kondisi eksisting untuk mengetahui seberapa besar dampak banjir dengan menggunakan bantuan program HEC-RAS 5.0.3. Perencanaan bangunan inlet direncanakan pelimpah samping dan outlet berupa pintu pengeluaran dan instalasi pompa. Tahap terakhir adalah melakukan perhitungan efektifitas untuk mengetahui besar efektifitas peredaman berdasarkan hasil kolam retensi yang di rencanakan dengan membandingkan ketinggian hasil sebelum dan sesudah adanya kolam retensi. Hasil dari perencanaan berdasarkan perbandingan analisa kondisi sebelum adanya kolam tinggi nuka air pada hilir sungai memiliki ketinggian 3.76 meter dan hasil dari peredaman setelah adanya ketinggian di hilir menjadi 2.97 m. Meninjau hasil analisa tersebut maka peredaman yang yang terjadi sebesar 21%. Kata Kunci : Banjir, HEC-RAS, Kolam Retensi, Pelimpah Samping ABSTRACT : The city of Balikpapan is located on the southern of East Kalimantan Province, with an area of about 503.30 Km 2 . Current conditions indicate that the city of Balikpapan continues to grow and these developments move from downstream to upstream. But unfortunately the rapid development of this city has not been matched by infrastructure conditions, so that in recent years the city of Balikpapan is often hit by flooding. It takes an effort to control the flood and retention pond is considered as the best problem solving to reduce the flood that occurred. In this study, a hydrological analysis was conducted to obtain the design flood discharge at the study site. Further hydraulics analysis was conducted to determine the condition of existing with flooding when 5 years to find out how big the impact of flooding by using the program assistance HEC-RAS 5.0.3. Planning of inlet buildings are planned side and outlet outlets in the form of pump discharge and installation doors. The last calculate the effectiveness to find out the effectiveness of the damping based on the result of retention pool that is planned by comparing the height of the result before and after the retention pond. The result of the planning based on the comparison of condition analysis prior to the existence of a high water pond in the river downstream has a height of 3.76 meters and the result of damping after the altitude downstream to 2.97 m. Reviewing the results of the analysis then the damping that occurred by 21%. Keywords : Flood, HEC-RAS, Retention pond, Side Weir
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ABSTRAK Pertumbuhan jumlah penduduk serta pembangunan di berbagai sektor mengakibatkan bertambahnya kebutuhan air. Berdasarkan hal tersebut maka diperlukan analisa neraca air untuk melihat keseimbangan antara ketersediaan air dengan... more
ABSTRAK Pertumbuhan jumlah penduduk serta pembangunan di berbagai sektor mengakibatkan bertambahnya kebutuhan air. Berdasarkan hal tersebut maka diperlukan analisa neraca air untuk melihat keseimbangan antara ketersediaan air dengan kebutuhan air di Sub DAS Metro untuk beberapa tahun kedepan. Neraca air di Sub DAS Metro dilakukan dengan menganalisa ketersediaan air menggunakan metode NRECA ( National Rural Electric Cooperative Association ) dengan keandalan 80%. Kebutuhan air yang dihitung yakni kebutuhan air domestik, non domestik, industri, peternakan, perikanan dan irigasi. Dari hasil analisa neraca air selama 25 tahun kedepan menunjukkan kondisi surplus untuk semua tahun dimana ketersedian air dianggap tetap yakni 532,72 m 3 /tahun. Dari hasil tersebut dapat disimpulkan bahwa ketersediaan air dapat mencukupi seluruh kebutuhan air di Sub DAS Metro. Kata Kunci : Sub DAS Metro, NRECA, Ketersediaan Air, Kebutuhan Air, Neraca Air. ABSTRACT The growth of population and development in various sectors led to increased water needs. Based of this, it is necessary to analysis the water balance to see the balance between water supplies and water needs at Metro Watershed for the next few years. Water balance analysis at Metro Watershed is conducted by analysing water supplies using NRECA (National Rural Electric Cooperative Association) with 80% reliability. Water demand is calculated namely the demand for domestic, non-domestic, industrial, farms, fisheries, and irrigation. From the result of the water balance analysis for the next 25 years shows a surplus condition for all years that availability of water is considered to remain 532,72 m 3 /year. From the result, it can be concluded that water availability can be adequate for all watern eeds in Metro Watershed. Keywords : Metro Watershed, NRECA, water demand, water supplies, water balance.
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Research Interests: Mathematics and Forestry
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Irrigation as part of the water power management source is a dynamic system in society, especially depending on the environmental condition because various actors are involved, diverse usage across the different administrative areas and... more
Irrigation as part of the water power management source is a dynamic system in society, especially depending on the environmental condition because various actors are involved, diverse usage across the different administrative areas and the various types of cultures. The condition is more aggravated with the existence subtraction of the available water source utilized as taking the main irrigation caused by changes climate, change of use land nor the other utilization like domestic needs. Water management, including water allocation, is a controversial environmental policy problem because heterogeneity-related interests with the source power together and increasing the level of conflict among the water use and the other users; because of that, the water supply is necessary to set just the right amount and time. The Irrigation Area of Rao's nursing home is located in the Panti District, Padang Gelugur District, South Rao District, and Rao District, which has a network of irrigation, gradually built starting from 1991. Therefore, the weir is expected to irrigate the Irrigation Area of Rao's nursing home, covering 8,300 ha, 5,800 ha on the right side and 2,500 ha on the left side. This paper aims to assess the allocation condition of the existing water in Rao's home dam. The methodology consists of analyzing and investigating the water balance method. The result shows that the availability of 80% reliable water on average of 11.97 m3/s which must consider the water needs of 20.22 m3/s show the lack of water throughout the year. By allocating the water for irrigation as a top priority after setting the water for maintenance of flow, the water for fisheries only fulfilled 48% of the total water needs of fish ponds.
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Research Interests: Physics and Irrigation
In depth analysis of area rainfall, there is necessary to considerate two type’s important thing about number of rainfall stations and their distribution in the watershed. Unsuitable number and disproportionately distribution of rainfall... more
In depth analysis of area rainfall, there is necessary to considerate two type’s important thing about number of rainfall stations and their distribution in the watershed. Unsuitable number and disproportionately distribution of rainfall stations will cause inaccuracy ready used data and in further impact it will cause the design, research, and management of water resources become not efficient and effective. This paper intended to analyze the density of rainfall stations due to the standard of WMO (World Meteorological Organization). WMO suggested the minimum of rainfall station number area which represented network density was between 100-250 km 2 /station. In this study, analysis of rainfall stations density used Kriging Method and standard of WMO. Results showed that based on the yearly averaged rainfall, there were recommended 14 and 15 rainfall stations in Kahayan Watershed and it was due to the Kriging Method and the standard of WMO. This result can be used as the reference for deciding the effective number and distribution of rainfall stations in the location of study.
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Irrigation is defined as the system through which water is utilized in agriculture. There are various ways in which an irrigation system, as implemented, can ensure maximum use of water. One such technique is the optimization technique.... more
Irrigation is defined as the system through which water is utilized in agriculture. There are various ways in which an irrigation system, as implemented, can ensure maximum use of water. One such technique is the optimization technique. Optimization techniques are commonly used to solve several water resource development problems in an area. A variety of aspects need to be explored on this front. These include putting in place an irrigation system. The present study focuses on the Gembleng Kanan irrigation area in Banyuwangi, which is spread over 407 ha. There is water shortage and decrease in the growth intensity during the dry season. The systems analysis and the crop production improvement uses dynamic program optimization. The results of this study show that the average irrigation water requirement in the growing season depending on the selected crop layout pattern is 0.236 m3.s-1 during the rainy season, 0.275 m3.s-1 during the dry season-1, and 0.14 m3.s-1 during dry season-2....
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This research aimed to investigate the characteristics of watershed morphometry that affect the main parameter that forms the Nakayasu Synthetic Unit Hydrograph (SUH). The result is will support the modification modeling of Nakayasu SUH.... more
This research aimed to investigate the characteristics of watershed morphometry that affect the main parameter that forms the Nakayasu Synthetic Unit Hydrograph (SUH). The result is will support the modification modeling of Nakayasu SUH. The formulation of time like (in the Nakayasu SUH) itself consists of the physical characteristic such as the main river length (L) that is limited regarding the category of main river length such as L > 15 km and L < 15 km. Due to the specific characteristics of the Nakayasu SUH formulation, this research will focus on the development of the Nakayasu SUH formulation by modification by adding the watershed characteristic parameter to the time lag (tg). This research was conducted in the 23 watersheds in Indonesia, which have the Automatic Water Level Recorder (AWLR) and Automatic Rainfall Recorder (ARR). However, this research is conducted on the 7 morphometry and time lag data that are watershed area (A), the length of the main river (L), riv...
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Studi perencanaan Pembangkit Listrik Tenaga Air mendesain infrastuktur guna memanfaatkan potensi di sungai cangar, Desa Sumberbrantas, Kecamatan Bumiaji, Kota Batu, Provinsi Jawa Timur. Perencanaan pada studi ini didapatkan debit rencana... more
Studi perencanaan Pembangkit Listrik Tenaga Air mendesain infrastuktur guna memanfaatkan potensi di sungai cangar, Desa Sumberbrantas, Kecamatan Bumiaji, Kota Batu, Provinsi Jawa Timur. Perencanaan pada studi ini didapatkan debit rencana Q 100 = 50,22 m 3 /detik lebar bendung 6,3 meter dan tinggi bendung = 1,5 meter menggunakan tipe pasangan batu. Peredam energi menggunakan tipe CANGAR dengan Panjang ambang 2,9 meter tinggi ambang hilir 1,0 meter dan lebar ambang hilir 2,0 meter. Debit desain pada bangunan pengambilan 0,052 m 3 /detik dengan lebar intake 1 meter dan tinggi muka air 2,4 meter. Saluran pembawa direncanakan memiliki kemiringan 0,1% lebar 0,5 meter dengan pasangan batu. Panjang dari bak pengendap 3,4 meter lebar 0,43 meter dengan volume tampungan 3,51 m 3 . Panjang dari bak penenang 3,75 meter lebar 1,5 meter dengan volume tampungan 0,798 m 3 . Pipa pesat pada PLTMH Cangar menggunakan pipa PVC dengan diameter 0,27 meter atau 11,023 inchi tetapi dikarenakan tidak ada ukuran pipa yang sama, maka mengikuti ukuran pipa pabrikasi = 10 inchi dengan Panjang pipa 88,8 meter. Klasifikasi turbin berdasarkan tinggi jatuhm aliran dan kecepatan spesifik (NS),iPLTMH Cangar menggunakan 2 turbin propeller . Spesifikasi teknis saluran pembuang disarankan sama dengan saluran pembawa. Daya yang dihasilkan PLTMH Cangar dengan debit 0,052 m 3 /detik dan tinggi jatuh efektif 14,16 meter adalah 75,93 kW. Jika diperuntukan untuk pemukiman dengan asumsi kebutuhan tiap rumah = 170 watt, maka daya yang dihasilkan dapat menghidupkan 44.664 rumah. Total biaya yang diperlukan untuk pembangunan PLTMH Canghar adalah 1.776.000.000,- terbilang satu milyar tujuh ratus tujuh puluh enam juta rupiah Planning study of Hydroelectric Power Station to design infrastructure to utilize the potential in the cangar river, Sumberbrantas Village, Bumiaji District, Batu City, East Java Province. Planning for this study was obtained by a combination of civil, mechanical and electrical buildings of Cangar MHP. With Q100th = 50,22 m 3 /second planned width of the dam is 6.3 meters and weir height = 1,5 meters. Energy absorbers use the CANGAR pool with froude at the end of the dam slope 2,807. Design discharge at building is taken = 0.052 m 3 /sec with intake width of 0.5 meters. The carrier channel is planned to have a slope of 0.1%, width of 0.5 meters with a pair of stones. The length of the sedimentary tub = 3.75 meters and width = 1.5 meters with a storage volume of 0,798 m 3 . Fast pipes in the Cangar MHP use PVC pipes with a diameter of 0.27 meters or 11.023 inches but because there is no same pipe size, it follows the size of the manufacturing pipe = 10 inches with a pipe length of 88,8 meters. Classification of turbines based on fall height, flow and specific speed (NS), Cangar MHP uses two Propeller Turbines. The recommended waster channel technical specifications are the same as the carrier channel.The power produced by the Cangar MHP with discharge of 0.052 m 3 /sec and the effective fall height of 14,16 meters is 75,93 kW. If it is intended for settlements with Asumsu needs of each house = 170 watts, then the power produced can turn 44.664 houses. The total cost needed for the construction of the Cangar MHP is Rp. 1,776,000,000 - which is one billion seven hundred seventy six million.
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This research intends to build the simulation of the Raknamo reservoir operation as to adaptation to the climate change impact in the semi-arid area. The methodology consists of the simulation for building the reservoir operation to... more
This research intends to build the simulation of the Raknamo reservoir operation as to adaptation to the climate change impact in the semi-arid area. The methodology consists of the simulation for building the reservoir operation to produce the optimal result. The optimization and simulation were carried out in the Raknamo dam that is located in the Raknamo village-Amabi Oefeto district-Kupang regency-NTT province. The development of the Raknamo dam is intended to fulfill the demands of irrigation water, raw water, and mini-hydro electrical generation. The water service is prioritized for irrigation that needs the water about 1.05 m3/s (1,050 l/s) through the water intake channel, which is flowed to rotate the turbine that will produce the electricity about 0.21 MW. The total of water that is needed including the raw water is 0.1 m3/s (100 l/s). The analysis results show that the water availability is unbalanced with the large outflow demand. This means that there is happened the wa...
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Synthetic rainfall is needed as an input in the analysis of design flood. This research intends to conduct the verification of a synthetic rainfall model based on the ArRR and satellite result. The rainfall data is as the main component... more
Synthetic rainfall is needed as an input in the analysis of design flood. This research intends to conduct the verification of a synthetic rainfall model based on the ArRR and satellite result. The rainfall data is as the main component in obtaining the design, detail design, operation and maintenance of effective water resource infrastructure. Rainfall data is often used for the analysis of flood balance, flood frequency distribution, estimation of river discharge, and design of water structure. However, the main constraint in designing the water resource infrastructure is less available rainfall data temporally and spatially. The limitation of available rainfall station number causes inaccuracy in analyzing the area mean rainfall. Therefore, sometimes the correlation between recorded data from the rainfall station and water estimation station does not show a positive and strong correlation. This is due to less rainfall data that are spatially representative in the watershed upstre...
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The Saguling dam is built on the cascade system of the Citarum river. The Saguling dam is located upstream of the system over the Cirata and Jatiluhur dams. Besides having the many benefits (irrigation, recreation, flood control, water... more
The Saguling dam is built on the cascade system of the Citarum river. The Saguling dam is located upstream of the system over the Cirata and Jatiluhur dams. Besides having the many benefits (irrigation, recreation, flood control, water storage, etc.), the Saguling dam saves the risk of big dangers in the case of the failure. The general failure or dam break reason of the Saguling dam can happen due to the internal and external factors. The internal factor is an occurrence of breach in the dam body that causes the process of piping in the top, center and low part of the dam body. Another internal factor is the mal-function of the spillway if the water discharge is too much. The external factor is the big flood discharge that can cause the overtopping. This research intends to conduct the simulation of dam failure or dam breaks in the Saguling dam. The methodology consists of data collection for the material of dam break analysis 2D like hydrology data, digital map, and technical data...
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The Noel Puames River is the main river in the Raknamo reservoir used for various purposes, such as irrigation water needs, raw water, fisheries, and others. In the rainy season, the Noel Puames River has enough large discharges, while,... more
The Noel Puames River is the main river in the Raknamo reservoir used for various purposes, such as irrigation water needs, raw water, fisheries, and others. In the rainy season, the Noel Puames River has enough large discharges, while, in the dry season, the Noel Puames River has almost no base flow. This study aims to determine the effect of climate change on rainfall characteristics in the Raknamo watershed. The methods used include the collection of rainfall data and watershed maps. The rainfall data were used by the Raknamo and Camplong rainfall stations for 25 years of observation resulting in the characteristics of rainfall decrease from time to time, especially the maximum daily rainfall. Annual rainfall tends to increase at Camplong station, but not at Raknamo station, which has the closest location to the Raknamo watershed. There has been a climate change in the Raknamo watershed as indicated by the Z value, which is not equal to zero (Z ≠ 0) although not significant excep...
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In calculating the design-flood discharge, engineers often use the frequency-distribution analysis of rainfall data as the basis for obtaining the magnitude of the design flood. The distribution of rain stations is an important factor in... more
In calculating the design-flood discharge, engineers often use the frequency-distribution analysis of rainfall data as the basis for obtaining the magnitude of the design flood. The distribution of rain stations is an important factor in determining the distribution of regional rainfall; however, not all catchments have sufficient rain stations to represent the distribution of precipitation in a watershed. This results in a flood hydrograph—obtained using a rainfall–runoff model that is based on the calculation of the estimated rainfall—with a low level of correlation with the observed hydrograph. This research aims to set up a synthetic rain station that corrects the difference between the simulated hydrograph and observed hydrograph to achieve a better correlation level. Usually, researchers use the available rain stations for analyzing the design rainfall and design flood; however, in this research, a synthetic rain station has been built. Rainfall–runoff modeling methods for ung...
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The Duriangkang reservoir was built in 1992–1995. It was the first estuary dam built in Indonesia and has the largest storage of any dam in Batam City. Its volume of effective storage is 107 million m3, and it is fulfilling the water need... more
The Duriangkang reservoir was built in 1992–1995. It was the first estuary dam built in Indonesia and has the largest storage of any dam in Batam City. Its volume of effective storage is 107 million m3, and it is fulfilling the water need at a rate of about 2,500 l/s. The Muka Kuning reservoir was completed in 1990 and began operating in 1991. Initially, the IPA Muka Kuning reservoir had a water production rate of 310 l/s, which increased to 600 l/s in 2015 because of Batam City’s increasing water needs. This research is aimed at assessing the water availability in the Duriangkang–Muka Kuning cascade reservoir system. This evaluation was carried out to support the integrated management of optimization in cascade reservoirs. In this cascade system of the Muka Kuning and Duriangkang reservoirs, water is taken from downstream into the upstream reservoir, and a pump is used to create inflow into the downstream reservoir. This study’s methodology comprises rainfall data tests, trend abse...
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The limitation of hydrograph data availability becomes an obstacle for the design of water resources. The obstacle makes the Synthetic Unit Hydrograph give the big enough benefit for the design of water resources. Ideally, every watershed... more
The limitation of hydrograph data availability becomes an obstacle for the design of water resources. The obstacle makes the Synthetic Unit Hydrograph give the big enough benefit for the design of water resources. Ideally, every watershed has its unit hydrograph. The Nakayasu Synthetic Unit Hydrograph is one of the synthetic unit hydrographs frequently used in the analysis of design flood discharge in Indonesia. However, the Nakayasu Synthetic Unit Hydrograph concept has been widely used and evaluated in some areas in Indonesia, and there is bias in determining the watershed characteristic coefficient. This research intends to investigate the characteristic of the observed hydrograph in every watershed and the whole watershed in the South Sulawesi Province-Indonesia. The research aims to build the alpha formula using alpha modeling with the affected parameters of watershed area, river length, river bed slope, shape factor, and the time concentration. Based on the ArcGIS version 10.7...
Research Interests: Watershed and HYDROGRAPH
This research will develop a groundwater irrigation system performance index model with the aim of identifying the groundwater irrigation system performance index; this information can be used by stakeholders to determine management... more
This research will develop a groundwater irrigation system performance index model with the aim of identifying the groundwater irrigation system performance index; this information can be used by stakeholders to determine management steps. The research location is in Gunungkidul Regency and includes surrounding areas — acknowledging that the karst aquifer has complex characteristics and non-karst aquifer, namely high heterogeneity as a result of the formation of a groundwater flow system through fractures which eventually becomes completely underground runoff. Screening for the variables was carried out using the smart-PLS (Partial Least Square) tool, which was then analyzed using the GRG (Generalized Reduced Gradient) method which is useful for solving non-linear equations. In this research, it examines the physical aspects, social aspects and management aspects as variables. The groundwater irrigation system performance index model examines 3 (three) variables, namely physical asp...
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Impacts of climate change have received extensive attention, especially for the semi-arid regions. Raknamo reservoir is located at Kupang Regency, a semi-arid area with significant differences in rainy duration (3–4 months) and dry... more
Impacts of climate change have received extensive attention, especially for the semi-arid regions. Raknamo reservoir is located at Kupang Regency, a semi-arid area with significant differences in rainy duration (3–4 months) and dry seasons (8–9 months). This preliminary study aimed to identify the recent factors that caused the delays in initial filling of Raknamo reservoir, which may be affected by climate change. There are three rainfall stations observed surrounding Raknamo watershed, namely Camplong, Naibonat and Raknamo. Direct comparisons were made of rainfall data for 33 years (1986-2019) daily. The climatology station Lasiana was used for climatological data with a data length of 33 years (1986-2019). This research used a qualitative approach, runoff was analyzed using regression analysis. The results showed that factors such as temperature (T), potential evapotranspiration (ETo), and rainfall (R) affected the availability of initial filling in the Raknamo reservoir. The amo...
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ABSTRAK : Sumber daya air terutama sungai selain memiliki peran penting bagi kehidupan manusia namun juga memiliki beberapa kerugian jika tidak dikelola dengan baik. Salah satu kerugian yang sering timbul adalah banjir khususnya di Kali... more
ABSTRAK : Sumber daya air terutama sungai selain memiliki peran penting bagi kehidupan manusia namun juga memiliki beberapa kerugian jika tidak dikelola dengan baik. Salah satu kerugian yang sering timbul adalah banjir khususnya di Kali Kamuning yang berada pada kabupaten Sampang. Maka, diperlukan analisa untuk mengetahui daerah mana saja yang terdampak banjir. Langkah awal yang dilakukan dalam menganalisa daerah terdampak banjir ini adalah dengan analisa hidrologi. Dalam analisa hidrologi ini dihitung debit banjir rancangan dengan kala ulang 2, 5, 10, 25, 50, dan 100 tahun dengan menggunakan metode HSS Nakayasu. Debit rancangan yang telah didapatkan kemudian diolah mengggunakan program HEC-RAS v5.0 dengan metode steady flow untuk mengetahui tinggi muka air yang disebabkan oleh banjir. Didapatkan besaran debit banjir sebesar Q 2th = 276,50 m 3 /det, Q 5th = 319,70 m 3 /det, Q 10th = 342,75m 3 /det, Q 25th = 367,49m 3 /det, Q 50th = 383,48 m 3 /det dan Q 100th = 397,76 m 3 /det. Pad...
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Abstrak : Penelitian ini untuk membandingkan antara 2 alternatif aturan operasi waduk Pengga dalam mengatur debit lepasan guna memenuhi kebutuhan sepanjang tahun. Waduk Pengga beroperasi dengan periode ½ bulanan. Ada 2 alternatif yang... more
Abstrak : Penelitian ini untuk membandingkan antara 2 alternatif aturan operasi waduk Pengga dalam mengatur debit lepasan guna memenuhi kebutuhan sepanjang tahun. Waduk Pengga beroperasi dengan periode ½ bulanan. Ada 2 alternatif yang disarankan untuk waduk Pengga, yaitu (1) aturan lepasan yang berdasarkan status tampungan waduk pada awal periode operasi, dan (2) rule curve sebagai batas bawah tampungan waduk pada setiap periode operasi. Aturan operasi lepasan waduk dari masing-masing alternatif dioptimasi untuk meningkatkan kinerjanya sampai mencapai batas maksimum, lalu dilakukan perbandingan antara kedua alternatif tersebut. Sebelum dilakukan optimasi, dilakukan revisi terhadap struktur daripada masing-masing aturan operasi untuk meningkatkan potensi perbaikan kinerja dalam optimasi. Pada aturan lepasan berdasarkan tampungan, revisi struktur dipusatkan pada peningkatan jumlah grid tampungan, sementara juga dicoba alternatif bentuk garis lepasan yang kontinyu d...
Research Interests: Engineering and Physics
Babak watershed is one of the major watersheds in Lombok with ± 259.166 km watershed area. Babak watershed is affected by 6 rainfall stations spread inside and outside the watershed. By using the standard of WMO (World Meteorological... more
Babak watershed is one of the major watersheds in Lombok with ± 259.166 km watershed area. Babak watershed is affected by 6 rainfall stations spread inside and outside the watershed. By using the standard of WMO (World Meteorological Organization) for mountainous area with the range of 100-250 km 2 /station for the tropics, assessment and analysis have been made and shown that two stations which did not fit the WMO standards of rain heading density. For example Keru and Jurang Sate Rainfall station, each of the station has an area of influence ± 60 km 2 . Furthermore, from the assessment and analysis using Kagan-Rodda method, there were two selected stations. While using Kriging method, there were three stations that have been chosen with one new placement inside the Babak watershed. Relative error of design rainfall for Kagan-Rodda method was between 2.36% -18.60% for every return period; whilst for Kriging method was between 7.90% - 13.57%. Hydrograph calibration result of Collins...
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As a type of gate that is used to control the water level upstream, sluice gate is the gate with simple shape and outstanding ability to flush the sediment. The operation of the gate is considered an important process. The up and down... more
As a type of gate that is used to control the water level upstream, sluice gate is the gate with simple shape and outstanding ability to flush the sediment. The operation of the gate is considered an important process. The up and down movement of the gate would affect the velocity and cause local scour as the result of fluctuating rate. This research aims to assess the effects of discharge and gate-opening height variations, as well as the type of bedchannel material, on the change of depth of scour (ds). The research was conducted of open channel flow model with a sluice gate able to up and down movement. The discharges used in the research were 9 types ranging from 1.0 to 5.0 dm3·s−1. There were 5 variations in the height of gate-opening ranging from 0.5 to 2.5 cm at intervals of 0.5 and types of channel-bed material. The results of the research showed that the depth of scour can be analysed as a function of discharge, height of gate-opening, height of water level upstream and dow...
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Reservoir operation is strongly influenced by water balance conditions in the catchment area. The amount of inflow, reservoir capacity, and water requirement are major factors in arranging the reservoir operation rules. The purpose of... more
Reservoir operation is strongly influenced by water balance conditions in the catchment area. The amount of inflow, reservoir capacity, and water requirement are major factors in arranging the reservoir operation rules. The purpose of this research is to obtain the extent of the parallel reservoir operation reliability that performed simultaneously by utilizing water transfer from wet to dry watershed. Simulation method used to operate the parallel reservoir with interconnecting tunnel between. From simulated results on three seasons, there are obtained that the water potential to be transferred to the dry watershed. By utilizing this water potential, further simulation for 25 years will come to see the reliability of the joint operating rule in this location.