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All Journal Indonesian Journal of Geography Jurnal Mahasiswa Jurusan Teknik Pengairan Jurnal Teknik Pengairan: Journal of Water Resources Engineering Rekayasa Sipil Jurnal Teknik Sipil U Karst Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Irigasi Civil and Environmental Science Journal (CIVENSE) Jurnal DISPROTEK International Journal Of Science, Technology & Management (IJSTM) International Journal of Engineering, Science and Information Technology Jurnal Teknologi dan Rekayasa Sumber Daya Air

Lily Montarcih Limantara

Civil Engineering Department, Faculty Of Engineering, Brawijaya University, Indonesia

Author-ID : 440748

Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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ANALISIS PENENTUAN NILAI PARAMETER ALFA MODEL HIDROGRAF SATUAN SINTETIS NAKAYASU PADA DAS KAMPILI PROVINSI SULAWESI SELATAN Rini, Firda Agustiya; Limantara, Lily Montarcih; Wahyuni, Sri
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 3, No 2 (2020)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Besarnya debit banjir dalam analisis hidrologi merupakan faktor penting dalam menentukan resiko dan nilai ekonomis suatu bangunan air. Pengembangan model Hidrograf Satuan Sintetis (HSS) telah banyak digunakan dalam mengestimasi banjir, salah satunya HSS Nakayasu. Seiring berjalannya waktu, penerapan model HSS Nakayasu semakin meluas di berbagai DAS Indonesia. Hal tersebut dikarenakan para praktisi di Indonesia menganggap penggunaan HSS Nakayasu sebagai model paling praktis. Namun pada kenyataannya, penerapan model tersebut masih memerlukan kalibrasi beberapa parameter mengingat perbedaan karakteristik, kondisi, dan pola hujan antara DAS di Indonesia dengan daerah dimana model HSS dikembangkan. HSS Nakayasu bergantung pada parameter α (alfa) yang berpengaruh pada ordinat hidrograf satuan dan waktu dasar hidrograf. Parameter α dapat menunjukkan karakteristik suatu DAS. Pada studi ini, parameter α terpilih yang sesuai dengan kalibrasi antara HSS Nakayasu dan hidrograf satuan pengamatan Collins adalah 0,839. Tingkat keakuratan model hasil kalibrasi didapatkan dari hasil validasi diantaranya adalah nilai kesalahan relatif sebesar 33,47 % dengan tingkat korelasi yang sangat baik yaitu R = 0,9805 dan determinasi (R2) = 0,9613. Selain itu hasil validasi menunjukkan nilai RMSE = 0,198; nilai MAE = 0,545; dan nilai NSE = 0,846. Hasil validasi tersebut menunjukkan kesesuaian model hidrograf terhadap hidrograf pengamatan sehingga parameter alfa yang didapat mewakili karakteristik DAS. The value of flood discharge in hydrology analysis is an important factor which the value determines of risk and economic value of water structure. The development of Synthetic Unit Hydrograph (HSS) models has been widely used to estimate flood, one of them is HSS Nakayasu. Over time, the applied of Nakayasu HSS model is more widely in various watersheds of Indonesia. It is caused by practitioners of Indonesia who assume HSS Nakayasu usage as the most practical model. Although in fact, the application of this model still requires calibration of several parameters that remember about differences in characteristics, conditions and rainfall patterns between watersheds in Indonesia and the regions where HSS model was developed. HSS Nakayasu depends on the parameter α (alpha) which affects the ordinate unit hydrograph and base time hydrograph. The parameter α can indicate the characteristics of watershed. On this study, the α parameter was selected that according to the calibration between the HSS Nakayasu and the Collins observation unit hydrograph is 0,839. The accuration level of model calibration obtained from the validation results include the relative error value is 33,47% with a very good correlation level which R = 0,9805 and determination (R2) = 0,9613. furthermore, the validation results indicate the value of RMSE = 0,198; the value of MAE = 0,545; and the value of NSE = 0,846. The validation results can indicate about conformity of model hydrograph to the observation hydrograph so that alpha parameters can represent the characteristics of watershed.

STUDI PERUBAHAN KARAKTERISTIK HIDROLOGI (DEBIT PUNCAK DAN WAKTU PUNCAK) AKIBAT PERUBAHAN TATA GUNA LAHAN DI BEBERAPA SUB DAS JENEBERANG PROVINSI SULAWESI SELATAN Alamsyah, Muhammad Bayu; Limantara, Lily Montarcih; Wahyuni, Sri
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 3, No 2 (2020)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Perubahan tata guna lahan pada DAS akan sangat mempengaruhi karakteristik hidrologi suatu kawasan, karakteristik hidrologi meliputi debit puncak dan waktu puncak pada sungai. Permasalahan yang diperkirakan ada pada perubahan tata guna lahan ini adalah meningkat atau menurunnya aliran permukaan yangaberpengaruh terhadap besar kecilnya debit puncak pada outlet DAS. Penelitian ini diharapkan untuk mengetahui apakah perubahan tata guna lahan pada sekitaran DAS Jeneberang berpengaruh secara signifikan terhadap perubahan karakteristik hidrologi DAS Jeneberang. Kebutuhan data pada penelitian ini menggunakan data sekunder seperti pasangan data curah hujan jam-jaman dan data debit (2008-1017), peta rupa bumi dan peta tematik berupa peta wilayah administrasi, peta penggunaan lahan dan peta topografi. Analisis perhitungan yang dilakukan pada penelitian ini menggunakan 2 (dua) alat bantu software yaitu MS. Excel untuk melakukan perhitungan statistik dan ArcGIS 10.3 untuk melakukan pengolahan data peta. Hasil penelitian diperoleh penggunaan lahan pada DAS Jeneberang adalah agrikebun, agriladang, agrisawah, hutan, pemukiman, rawa/tambak dan semak belukar. Dari hasil pengolahan diketahui perubahan kawasan semak belukar menjadi kawasan hutan menjadi perubahan paling besar. Hasil perubahan ini sejalan dengan prinsip dasar hidrologi dikarenakan rerata debit yang dihasilkan dari perhitungan menggunakan Hidrograf Satuan Pengamatan (HSP) cara Metode Collins dengan perbandingan tahun awal dan tahun akhir mengalami penurunan.Land use changes in the watershed will greatly affect the hydrological characteristics of an area, hydrological characteristics including peak discharge and peak times in rivers. The problem that is predicted to exist in this land use change is an increase or decrease in surface runoff so that it affects the size of the peak discharge at the watershed outlet. This study aims to determine whether changes in land use around the Jeneberang watershed have a significant effect on changes in the hydrological characteristics of the Jeneberang watershed. The data requirements in this study use secondary data such as pairs of hourly rainfall data and discharge data (2008-1017), earth maps and thematic maps in the form of administrative area maps, land use maps and topographic maps. Analysis of calculations carried out in this study using 2 (two) software tools, namely MS. Excel for performing statistical calculations and ArcGIS 10.3 for processing map data. The results showed that land uses in the Jeneberang watershed were agriculture, forests, settlements, swamps/ponds and shrubs. From the results of processing, it is known that the changes in scrub areas to forest areas is the biggest changes. The results of this changes are in line with the basic principles of hydrology because the average discharge resulting from calculations using the Hydrograph of the Unit of Observation (HSP) method of the Collins Method with the comparison of the initial year and the final year has decreased.

STUDI KELAYAKAN RENCANA PEMBANGUNAN EMBUNG PENIWEN DESA PENIWEN KECAMATAN KROMENGAN KABUPATEN MALANG Ferina, Marisa Ayu; Limantara, Lily Montarcih; Sholichin, Moh.
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 3, No 2 (2020)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Kabupaten Malang yakni daerah agraris dengan jumlah penduduk 2.544.315 (BPS Kab Malang, 2018), oleh karena itu dibutuhkan ketersediaan air baku untuk irigasi. Pengaruh perubahan iklim, air menjadi berkurang dan banyak mata air yang mati pada musim kemarau, untuk itu pembangunan embung menjadi solusi utama.Studi ini bertujuan untuk mengetahui kelayakan pembangunan Embung Peniwen ditinjau dari aspek teknis dan aspek ekonomi. Dari analisis teknis Embung Peniwen dapat menampung volume air sebesar 52.032,55 m3 dengan areal irigasi 75 Ha. Sedangkan simulasi tampungan, Embung Peniwen dapat memenuhi kebutuhan air irigasi dengan pola tanam Padi-Padi-Palawija Dari hasil perhitungan diperoleh nilai pembangunan sebesar Rp. 6.185.840.000 termasuk Pajak Pertambahan Nilai (PPN). Kondisi normal diperoleh nilai NPV=Rp. 794.466.428, B/C=1,116, EIRR=14,440%. Kondisi manfaat turun 10%, biaya tetap diperoleh NPV=Rp. 31.998.961, B/C=1,005, EIRR=12,102%. Kondisi manfaat dan biaya tetap, pelaksanaan terlambat 1 tahun diperoleh NPV=Rp. 77.759.182, B/C=1,133, EIRR=12,216%. Disimpulkan bahwa pembangunan Embung Peniwen layak secara teknis dan ekonomi untuk dibangun.Malang Regency is an agricultural area with a population of 2,544,315 (BPS Kab Malang, 2018), therefore it requires the availability of raw water for irrigation. The effect of climate change is that water is reduced and many springs die in the dry season, so the construction of embung is the main solution. This study aims to determine the feasibility of developing the Peniwen Embung in terms of technical and economic aspects. From the technical analysis, the Peniwen Embung can accommodate a volume of water of 52,032.55 m3 with an irrigation area of 75 hectares. While the storage simulation, Peniwen Embung can meet the needs of irrigation water with the cropping pattern of Rice-Padi-Palawija. From the calculation results, the development value is Rp. 6,185,840,000 including Value Added Tax (VAT). Under normal conditions, the NPV value = Rp. 794,466,428, B / C = 1,116, EIRR = 14,440%. Benefit condition decreased by 10%, fixed cost obtained NPV = Rp. 31,998,961, B / C = 1,005, EIRR = 12.102%. Conditions for benefits and fixed costs, one year late implementation, the NPV = Rp. 77,759,182, B / C = 1,133, EIRR = 12,216%. It was concluded that the construction of the Peniwen Embung was technically and economically feasible to BUILD.Kabupaten Malang yakni daerah agraris dengan jumlah penduduk 2.544.315 (BPS Kab Malang, 2018), oleh karena itu dibutuhkan ketersediaan air baku untuk irigasi. Pengaruh perubahan iklim, air menjadi berkurang dan banyak mata air yang mati pada musim kemarau, untuk itu pembangunan embung menjadi solusi utama.Studi ini bertujuan untuk mengetahui kelayakan pembangunan Embung Peniwen ditinjau dari aspek teknis dan aspek ekonomi. Dari analisis teknis Embung Peniwen dapat menampung volume air sebesar 52.032,55 m3 dengan areal irigasi 75 Ha. Sedangkan simulasi tampungan, Embung Peniwen dapat memenuhi kebutuhan air irigasi dengan pola tanam Padi-Padi-Palawija Dari hasil perhitungan diperoleh nilai pembangunan sebesar Rp. 6.185.840.000 termasuk Pajak Pertambahan Nilai (PPN). Kondisi normal diperoleh nilai NPV=Rp. 794.466.428, B/C=1,116, EIRR=14,440%. Kondisi manfaat turun 10%, biaya tetap diperoleh NPV=Rp. 31.998.961, B/C=1,005, EIRR=12,102%. Kondisi manfaat dan biaya tetap, pelaksanaan terlambat 1 tahun diperoleh NPV=Rp. 77.759.182, B/C=1,133, EIRR=12,216%. Disimpulkan bahwa pembangunan Embung Peniwen layak secara teknis dan ekonomi untuk dibangun.Kabupaten Malang yakni daerah agraris dengan jumlah penduduk 2.544.315 (BPS Kab Malang, 2018), oleh karena itu dibutuhkan ketersediaan air baku untuk irigasi. Pengaruh perubahan iklim, air menjadi berkurang dan banyak mata air yang mati pada musim kemarau, untuk itu pembangunan embung menjadi solusi utama.Studi ini bertujuan untuk mengetahui kelayakan pembangunan Embung Peniwen ditinjau dari aspek teknis dan aspek ekonomi. Dari analisis teknis Embung Peniwen dapat menampung volume air sebesar 52.032,55 m3 dengan areal irigasi 75 Ha. Sedangkan simulasi tampungan, Embung Peniwen dapat memenuhi kebutuhan air irigasi dengan pola tanam Padi-Padi-Palawija Dari hasil perhitungan diperoleh nilai pembangunan sebesar Rp. 6.185.840.000 termasuk Pajak Pertambahan Nilai (PPN). Kondisi normal diperoleh nilai NPV=Rp. 794.466.428, B/C=1,116, EIRR=14,440%. Kondisi manfaat turun 10%, biaya tetap diperoleh NPV=Rp. 31.998.961, B/C=1,005, EIRR=12,102%. Kondisi manfaat dan biaya tetap, pelaksanaan terlambat 1 tahun diperoleh NPV=Rp. 77.759.182, B/C=1,133, EIRR=12,216%. Disimpulkan bahwa pembangunan Embung Peniwen layak secara teknis dan ekonomi untuk dibangun.

Performance of The Dispin Models with Automatic Parameter Calibration on The Transformation of Rainfall to Runoff Data Sulianto, Sulianto; Bisri, M.; Limantara, lily Montarcih; Sisinggih, Dian
Civil and Environmental Science Journal (CIVENSE) Vol 2, No 2 (2019)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2019.00202.2

This article presents a new model of the DISPRIN Model combination with two different level optimization methods. The new model of DISPRIN Model combination and Differential Evolution (DE) algorithm is called DISPRIN25-DE Models and its incorporation with Monte Carlo Simulation method called DISPRIN25-MC Models. The case study is Lesti Watershed (319.14 Km2) in East Java. The model test uses a 10-year daily data set, from January 1, 2007 to December 31, 2016. Data series Year 2007 ~ 2013 as a set of training data for calibration and data Year 2014 ~ 2016 as testing data set for model validation. Running program DISPRIN25-DE Models with input parameter value C_min = 0, C_max = 1, H_min = 0, H_max = 600 mm obtained best fitness 0.044 m3/sec, NSE = 0.762 and PME = -0.059. The DISPRIN25-MC Models analysis generates a minimum RMSE of 0.056 m3/sec, NSE = 0.779, PME = -0.70. From the RMSE and NSE indicators it appears that both models can show an equivalent level of performance, but in terms of the PME indicator and iteration time is apparent The DISPRIN25-MC model has worse performance than the two DISPRIN25-DE models.

STUDI KELAYAKAN RENCANA PEMBANGUNAN EMBUNG PENIWEN DESA PENIWEN KECAMATAN KROMENGAN KABUPATEN MALANG Ferina, Marisa Ayu; Limantara, Lily Montarcih; Sholichin, Moh.
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 4, No 1 (2020)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Abstrak Kabupaten Malang yakni daerah agraris dengan jumlah penduduk 2.544.315 (BPS Kab Malang, 2018), oleh karena itu dibutuhkan ketersediaan air baku untuk irigasi. Pengaruh perubahan iklim, air menjadi berkurang dan banyak mata air yang mati pada musim kemarau, untuk itu pembangunan embung menjadi solusi utama. Studi ini bertujuan untuk mengetahui kelayakan pembangunan Embung Peniwen ditinjau dari aspek teknis dan aspek ekonomi. Dari analisis teknis Embung Peniwen dapat menampung volume air sebesar 52.032,55 m3 dengan areal irigasi 75 Ha. Sedangkan simulasi tampungan, Embung Peniwen dapat memenuhi kebutuhan air irigasi dengan pola tanam Padi-Padi-Palawija Dari hasil perhitungan diperoleh nilai pembangunan sebesar Rp. 6.185.840.000 termasuk Pajak Pertambahan Nilai (PPN). Kondisi normal diperoleh nilai NPV=Rp. 794.466.428, B/C=1,116, EIRR=14,440%. Kondisi manfaat turun 10%, biaya tetap diperoleh NPV=Rp. 31.998.961, B/C=1,005, EIRR=12,102%. Kondisi manfaat dan biaya tetap, pelaksanaan terlambat 1 tahun diperoleh NPV=Rp. 77.759.182, B/C=1,133, EIRR=12,216%. Disimpulkan bahwa pembangunan Embung Peniwen layak secara teknis dan ekonomi untuk dibangun. Abstract Malang Regency is an agricultural area with a population of 2,544,315 (BPS Kab Malang, 2018), therefore it requires the availability of raw water for irrigation. The effect of climate change is that water is reduced and many springs die in the dry season, so the construction of embung is the main solution. This study aims to determine the feasibility of developing the Peniwen Embung in terms of technical and economic aspects. From the technical analysis, the Peniwen Embung can accommodate a volume of water of 52,032.55 m3 with an irrigation area of 75 hectares. While the storage simulation, Peniwen Embung can meet the needs of irrigation water with the cropping pattern of Rice-Padi-Palawija. From the calculation results, the development value is Rp. 6,185,840,000 including Value Added Tax (VAT). Under normal conditions, the NPV value = Rp. 794,466,428, B / C = 1,116, EIRR = 14,440%. Benefit condition decreased by 10%, fixed cost obtained NPV = Rp. 31,998,961, B / C = 1,005, EIRR = 12.102%. Conditions for benefits and fixed costs, one year late implementation, the NPV = Rp. 77,759,182, B / C = 1,133, EIRR = 12,216%. It was concluded that the construction of the Peniwen Embung was technically and economically feasible to build.

Predictive numerical modeling of groundwater drawdown impacts in Jakarta Iwan Nursyriwan; Muhammad Bisri; Lily Montarcih; Ery Suhartanto
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

An excessive groundwater usage is happening in Jakarta, Indonesia, due to the population growth and industrial development so that it experiences a significant groundwater drawdown which could enhance the risk of seawater intrusion and land subsidence. Existing conditions in 2018 show that seawater intrusion occurred at the Western and Central coastal area and land subsidence happen in the Northern and Central part. This research, a numerical simulation, is conducted by modeling such causality during the critical period, the next 20 years. The result shows that for every groundwater drawdown of 10 m/year, it will cause intrusion 0.7 km/year in the Western and Central and 1.1 km/year in the Eastern area after 2028. The 10 m/year groundwater drawdown also results in land subsidence of 5.7 cm/year in the Northern and 2.5 cm/year in Central Jakarta. This result is useful as an input for groundwater management policies and to prevent the environmental impacts occurred at other large coastal cities.

Water Balance Supporting the Irrigation Water Demand in Java Island, Indonesia Yudha Mediawan; Lily Montarcih; Widandi Soetopoi; Tri Budi Prayogo
Indonesian Journal of Geography Vol 53, No 1 (2021): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.59102

Java is the most populous island with the largest percentage of rice fields in Indonesia. However, rice fields in Java Island often experience water shortages, so an analysis of the potential water availability for irrigation in Java is required. This research aims to analyze water's potential to meet irrigation water needs in each catchment area in Java. In this research, the potential for irrigation water in Java is calculated based on the balance of water balance between water availability and DMI and Irrigation water needs. This research is divided into two parts: (1) analysis of water availability using the WFLOW hydrological simulation; and (2) water demand analysis based on population statistical data. Based on this research, it can be concluded that the water balance between water resources and irrigation water needs in Java is still in the surplus category, even though there are deficits in several catchment areas (WS): in the Kepulauan Seribu, Wiso Gelis, and Welang Rejoso WS. WS with the most water availability is generally located in wide (WS) areas, while several WS with abundant water needs is generally located in WS with the densest population. According to The Central Bureau of Statistics (BPS), the agricultural area in Java has decreased by an average of 20 thousand hectares per year, so that the demand for irrigation water on the island of Java will also decrease. Consequently, the excess water potential in Java Island needs to be allocated to meet the needs of DMI, which are increasing every year. In addition, the results also show that the development of irrigation areas in the future should be focused on large (WS) areas that have the potential for significant amounts of irrigation water.

Analisa Keandalan Tampungan Waduk di Embung Tambak Pocok Bangkalan Lily Montarcih Limantara; Whima Regianto Putra
Jurnal Teknik Sipil Vol 23 No 2 (2016)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2016.23.2.5

Abstrak. Kebutuhan air domestik dihitung berdasarkan jumlah penduduk dan standar kebutuhan air di wilayah administratif yang akan dilayani. Untuk mengestimasi ketersediaan air dalam studi ini digunakan analisa debit Model NRECA dan F.J Mock. Untuk keperluan analisa keandalan tampungam, berdasarkan data debit hasil simulasi F.J Mock dan NRECA selama 20 tahun, dilakukan perpanjangan data debit dengan menggunakan metode Thomas-Fiering. Hasil simulasi keandalan embung dengan melakukan proses simulasi tiap data debit hasil bangkitan sepanjang 20 tahun dengan masa proyeksi selama 20 tahun dengan asumsi tidak ada perubahan parameter DAS, terdapat indikasi bahwa data debit untuk NRECA mengalami kegagalan pada debit tahun 2004, terjadi peluang keandalan 100% pada tahun 2007, dan 25% pada tahun 2026. Sedangkan untuk data debit hasil dari F.J Mock, peluang keandalan 100% terjadi pada tahun 2007 sampai dengan tahun 2026 untuk semua simulasi data debit. Dikarenakan tidak adanya data debit di lapangan, maka pemilihan data debit dilakukan dengan mengambil Qmin untuk masingmasing data debit. Dari 2 metode tsb didapatkan untuk Qmin hasil dari F.J Mock embung memiliki tingkat keandalan 100% pada tahun 2007 sampai dengan 2026, sedangkan untuk Qmin NRECA embung hanya mampu melayani seluruh penduduk (100%) pada tahun 2007, sedangkan untuk tahun-tahun berikutnya mengalami penurunan hingga 25% pada tahun 2026.Abstract. Domestic water demand is analyzed based on the number of population and the standard of water demand in served administrative region. To estimate the water supply, this study used the models of NRECA and F.J. Mock. For analyzing reservoir reliability based on the simulation discharge result of F.J. Mock and NRECA during 20 years there was needed discharge data generated by using Thomas Fiering method. Simulation result of small-dam reliability by carrying out the simulation process every discharge data of generated result along 20 years with the projection during 20 years indicated that discharge result of NRECA was failure in 2004 and it assumes that there is no parameter change in catchment, it had the possibility of reliability on 100% in 2007 and 25% in 2026. however, discharge result of F.J. Mock had the possibility of reliability on 100% and it was happened in 2007, and 25% in 2026 for the whole simulation of discharge. There was no discharge data in study location, so minimum discharge was the optional one. Based on the two methods, the Qmin of F.J. Mock has the reliability level of 100% in 2007 until 2026. However Qmin of NRECA has only the ability to serve the whole population (100%) in 2007 but for the next years there was decreasing until 25% in 2026.

Hidrograf Satuan Sintetik Limantara (Studi Kasus di Sebagian DAS di Indonesia) Lily Montarcih Limantara
Rekayasa Sipil Vol 3, No 3 (2009)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.115 KB)

Ideally, every watershed has its own particular unit hydrograph. If the physical and hydrologicalconditions in general are quite homogeneous, it would be quite possible to create a new SUH model thatresembles the ones made up by previous researchers. The SUH model is intended purposefully for (1)finding out the nature of watershed responses against precipitation data input, where by it could become thesupportive warning systems to areas that are vulnerable to flooding, (2) resuming up hydrograph dataavailability that are previously vacant due to the operational problem of the Automatic Water Level Recorder(AWLR), and (3) producing a specific SUH model for Indonesia (SUH Limantara) with a simplemathematical model and without the necessary parametric calibration prior of its application.This research was done on Java island (involving 6 watersheds and 67 sub-watersheds), on Bali island(involving 2 watersheds and 13 sub-watersheds) and on the east part of Borneo island / pulau Kalimantan(involving 1 watershed and 9 sub-watersheds). The watershed criteria are that every watershed has an area of< 5000 km2 and both ARR (Automatic Rainfall Recorder) and AWLR. The calibration model to the observedhydrograph refers to as the amount of the minimum least square. Verification of the result was conducted byfilling up to the model the discrepancies of hydrology data. The results of this study are: the peak time ofhydrograph = 5.773 hours, the recession time of hydrograph = 9,859 hours and the base time of hydrograph =15,632 hours; the peak discharge model: Qp = 0,042 * A0,451 * L0,497 * Lc0,356 * S-0,131 * n0,168; the rising curveequation: Qn = Qp * [(t/Tp)]1,107 and the recession equation: Qt = Qp.e0,175(Tp – t). Based on these results, it isconcluded that: 1) The observed hydrograph really typifies the elongated shaped watershed, which has afaster rising characteristic than that of its recession (hydrograph rising time < hydrograph recession time); 2)There are 5 dominant watershed parameters that influence the peak discharge; they are the length of mainriver/stream (L), followed by the areal size of watershed (A), the length of the main river to be measured upto a point location nearest to the watershed weight centre (Lc), the roughness coefficient (n) and the riverslope (S); 3) the SUH of this research is compared with the observation hydrograph and as a model control.The coefficient of determination (R2) and the level of significance 5% are for the peak discharge (R2 =0,841), the rising curve (R2 = 0,980) and the recession curve (R2 = 0,990). Besides the SUH Limantara isalso compared with the SUH Nakayasu and the deviation obtained is 1,224%.

Analisis Neraca Air Sub DAS Irigasi Wirway Kabupaten Sarmi Provinsi Papua Ery Suhartanto; Lily Montarcih Limantara; Ariston Samosir
Jurnal Irigasi Vol 7, No 2 (2012): Jurnal Irigasi
Publisher : Balai Teknik Irigasi

District Bonggo, Sarmi Regency is one of the technical potential of irrigated land in The Province of Papua are not utilized optimally. Given the ever increasing demand for rice and in line with population growth in annual Sarmi Regency ranged 8-10% (BPS Papua, 2010), Central River Region (BWS) Papua through a section of Planning and Program Development plans to make a program of irrigation areas in the District Bonggo, Sarmi Regency. The study was carried out at Inggi Subbasin, Wirway Watershed, Sarmi Regency of Papua Province. The results showed that an alternative irrigation water demand in selected alternative 4 at DI Bonggo based PTT that was created is to broad Ha 3200 irrigation water needs of a maximum of 7.45 m3/sc, for the vast 2500 ha of irrigation water needs of a maximum of 5.82 m3/sc, for the area of 2,000 ha of irrigation water needs of a maximum of 4.66 m3/sc, for the vast 1500 ha of irrigation water needs of a maximum of 3.49 m3/sc, and for the extensive 1000 ha of irrigation water needs of a maximum of 2.33 m3/sc . For domestic water needs of the average in Inggi Subbasin in the year 2026 amounting to 0.00394 m3/sc. Whereas the minimum discharge is available for a maximum of 2.46 and 0.12 m3/sc. The Efforts of irrigated water is not able to provide some alternative plans with broad regional Irrigation (DI). Alternative calculated based on planting time changes with 4 alternatives of planting begin, where alternative IV has lowest defisit.

Co-Authors A.A. Ketut Agung Cahyawan W Achmad Hariyadi Adiputra, Dhimas Satibi Agi Putra Kharisma, Agi Putra Agung Rahmadi Agus Priombodo Agustina Pagatiku Alamsyah, Muhammad Bayu Ambarwati, Arum Nurwidya Aniek Masrevaniah Arfiyanti, Anandini Fatma Arief Andy Soebroto Arif Rahmad Darmawan Ariston Samosir Azhari, Zeinnia Alya Azwar Annas Kunaifi Chandrasasi, Dian Damayanti, Alvine Cinta Dian Chandrasasi Dian Sisinggih Diando, Azamulail Djunaedi Djunaedi Donny Harisuseno Dwi Priyantoro Edison Hukom Eka Agus Subiyantoro Emma Yuliani Endang Purwati RN Ery Suhartanto Ery Suhartanto Ery Suhartanto Fandianto, Erno Fathia, Ayasha Fauziyah, Fauziyah Februanto, Aaron Jeremy Ferina, Marisa Ayu Hana Arum Rossy Tamaya Haris Djafar, Haris Harisuseno, Donny Harri Pranowo Ikrar Hanggara, Ikrar Ilham, Rendy Khoirul Indra Kusuma Sari Islamiyanto, Yudho Putra itojo Tri Juwono Iwan Nursyriwan Jadfan Sidqi Fidari Jamhari Jamhari Juma'a, Muhammad Walidi Juni, Riska Wulan Kharistanto, Robertus Tegar Kurnia Lalu Sigar Canggih Ranesa, Lalu Sigar Canggih Lenny Febriana Ideawati, Lenny Febriana Linda Prasetyorini Lucky Dyah Ekorini M. Bisri Mahendra, Hardiman Maulida Hayati Megantara, Anggit Gilang Mochammad Ibrahim Moh. Sholichin Moh. Sholichin Mohammad Bisri Mokhamad Rusdha Maulana Muhamad Rodhita Muhammad Bisri Muhammad Ilham nalurita, sari Nuf'a, Hilma Nugrahanto, Bagus Aji Nurdiyanto Nurdiyanto, Nurdiyanto nurfitriani, Alvina nurfitriani, Alvina Nurul Hidayat Pitojo Tri Juwono Pramasela, Pramasela Putra, Whima Regianto Qomarul Huda, Qomarul Rachma, Siti Talitha Rahmah Dara Lufira Ramadian, Bagas ramdhani, fitroh Respatiningrum, Amalia Wara Rini Wahyu Sayekti Rini, Firda Agustiya Rispiningtati Rispiningtati Riwin Andono Riyanto Haribowo Rony Rudson Rossy Tamaya, Hana Arum Runi Asmaranto Safira Anisah Haromain Safira Anisah Haromain Salimah, Ghaida Nurul Salsabila, Nadia Semuel J. Ch. Ahab, Semuel J. Ch. Shihab, Muhammad Qurais Sri Wahyuni Sri Wahyuni Sri Wahyuni Suhardjono Suhardjono Sulianto Sulianto Suwanto Marsudi Tae Lake, Geovani Valerian Maria Tri Budi Prayogo Tri Budi Prayogo, Tri Budi Triwidianto, Heru Tyas Daru, Tyas Ussy Andawayanti Very Dermawan Wahyuni, Sri Wahyuni, Sri Wayan Firdaus Mahmudy Whima Regianto Putra Widandi Soetopo Yanuar Wicaksono, R. Fajar Yudha Mediawan Yumna Atika

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