Lily Montarcih Limantara - Academia.edu (original) (raw)

Papers by Lily Montarcih Limantara

Civil Engineering Journal, Jul 1, 2023

This research intends to predict the discharge (run-off) from rainfall for which the model is bui... more This research intends to predict the discharge (run-off) from rainfall for which the model is built using W-flow. The research location is in the Gajah Mungkur reservoir (Wonogiri) in Indonesia. The estimation of reservoir inflow has an important role, mainly in the scheme of reservoir operation and management. However, the heterogeneity of complex spatial and temporal patterns of rainfall and also the physiographic context of a watershed cause the development of a model of real-time runoff and rainfall that can accurately predict the reservoir inflow to become a challenge in the development of water resources. In relation to the analysis and prediction of rainfall, the constraint and problem that is still often faced is the minimal availability of observed rainfall data spatially as well as temporally; the time series of rainfall data is not long and complete enough; and the number of rainfall stations is less evenly distributed. The methodology consists of carrying out the literature study, collecting as much rainfall data as possible to build a W flow model, then carrying out the model calibration and analyzing the prediction of real-time reservoir inflow for operation. The result shows that the dependable discharge of the Wonogiri watershed shows that there are two peak discharges, which happened on February II (the second half of February) and December II (the second half of December). However, the discharge is decreasing in July and reaching its lowest level in October II (the second half of October).

Jurnal Teknik Pengairan: Journal of Water Resources Engineering, Sep 18, 2014

Daerah Irigasi Lodoyo mencakup dua wilayah kabupaten yaitu Kabupaten Blitar dan Kabupaten Tulunga... more Daerah Irigasi Lodoyo mencakup dua wilayah kabupaten yaitu Kabupaten Blitar dan Kabupaten Tulungagung. Daerah Irigasi Lodoyo sendiri memiliki intake di Bendungan Wlingi di wilayah Kabupaten Blitar. Bendungan Wlingi terletak pada Sungai Brantas yaitu di Desa Jegu Kecamatan Sutojayan Kabupaten Blitar ± 30 km di hilir Bendungan Sutami. Manfaat dan tujuan yang diharapkan dari dibangunnya Bendungan Wlingi Raya ini adalah untuk penyediaan air irigasi dan membangkitkan PLTA. Areal irigasi DI Lodoyo mempunyai luas baku sawah 12.219 ha yang terdiri 12.204 irigasi dan 15 ha untuk tambak. Jenis tanaman yang ditanam pada areal DI Lodoyo untuk setiap musim tanam adalah : (1)

Jurnal Teknik Pengairan: Journal of Water Resources Engineering, Oct 3, 2014

Penilaian Kinerja Daerah Aliran Sungai menggunakan indikator hidrologi merupakan cara cepat dan e... more Penilaian Kinerja Daerah Aliran Sungai menggunakan indikator hidrologi merupakan cara cepat dan efektif untuk mengetahui kondisi kinerja DAS Konaweha akibat perubahan tata guna lahan yang terjadi. Lokasi studi DAS Konaweha berada di Provinsi Sulawesi Tenggara yang meliputi Kota Kendari, Kabupaten Konawe, dan Kabupaten Kolaka dengan luas DAS ± 6020 km 2. Studi ini dilakukan dengan tujuan untuk mengetahui respon DAS Konaweha terhadap perubahan tata guna lahan di tahun 2000 sampai tahun 2010, serta arahan penggunaan lahan RTRW (Rencana Tata Ruang Wilayah) Provinsi Sulawesi Tenggara menggunakan metode analisis spasial dengan bantuan perangkat lunak AVSWAT. Indikator kinerja DAS yang dipakai dalam indikator penilaian adalah debit untuk mengetahui nilai Koefisien Regim Sungai (KRS), koefisien limpasan, serta angkutan sedimen yang terjadi di DAS Konaweha. Berdasarkan ketiga indikator dan hasil perhitungan analisa spasial ini bisa disimpulkan bahwa DAS Konaweha termasuk dalam Kategori Baik. Nilai KRS yang didapat pada tahun 2000 dan 2010, serta arahan penggunaan lahan RTRW antara 99-102 yang menunjukkan DAS Konaweha dalam kategori sedang. Indikator koefisien limpasan yang dipakai mendapatkan nilai antara 0,045-0,1 yang menunjukkan standar penilaian termasuk dalam kategori baik. Demikian pula indikator angkutan sedimen dengan nilai 0,5-0,105 yang juga menunjukkan DAS dalam kategori baik. Nilai KRS yang termasuk dalam kategori sedang menunjukkan DAS Konaweha mempunyai daya dukung yang kurang baik untuk menyimpan dan menahan air yang ada. Pembangunan bendungan, embung, dan upaya teknis lainnya perlu dilakukan agar dapat meningkatkan kemampuan kinerja DAS Konaweha dalam hal menurunkan nilai Koefisien Regim Sungai (KRS) sehingga mendapatkan skor penilaian yang lebih baik.

Jurnal Teknologi dan Rekayasa Sumber Daya Air, Apr 15, 2021

International journal of GEOMATE : geotechnique, construction materials and environment, Nov 1, 2018

This research studies the hydraulic behavior and the problem solving alternatives of original unt... more This research studies the hydraulic behavior and the problem solving alternatives of original until final design, and the most effective stilling basin and downstream regulator channel for decreasing back water from the upstream water level in the dam foot. The methodology consists of physical modeling in the Laboratory of River and Swamp, Department of Water Resources, Faculty of Engineering, University of Brawijaya. The methods include the USBR for the hydraulic analysis, the Hind's formulation for the side channel analysis, the energy equation by analyzing the standard step for the transition and the chute way analysis, and the USBR type III for designing the stilling basin. A square cross-section with the Manning coefficient of 0.40 is used for determining the control of the Tail Water Level (TWL) and a trapezoidal crosssection with the Manning coefficient of 0.39 is used for the final design. However, the equation of Schotlisch and Veronise is used for the local scouring analysis. The result of Model Test and analysis indicates that there are some differences among the analysis in every point of the building. Therefore, the relative error is needed to know how big the error in the comparison result.

IOP conference series, May 1, 2023

One of the problems involving water bodies is the pollution of water sources, which later becomes... more One of the problems involving water bodies is the pollution of water sources, which later becomes the parent of various social, economic, and health problems. One of these conditions can be overcome by utilizing phytoremediation through constructed wetlands. HYDRUS is a software that offers easy modelling of pollutant decay mechanisms in water bodies and constructed wetlands using finite element method. This study aims to show and analyse how HYDRUS software can model the mechanism in constructed wetland by using finite element method. The parameters observed are the time for the pollutant, namely ammonia, nitrate, and inorganic phosphorous, to reach the outlet, and the response curve of the pollutant loading on the model. From the simulation, it can be inferred that the maximum velocity of the water going through the constructed wetland is 8.11 m/day, or 811 cm/day. The dominating velocity in the wetland is around 160 cm/day, or 1.6 m/day. The response curve of the pollutant transport is also in accordance with theoretical response for impulse loading. The result yields the effectivity of simulated constructed wetland, which are 90.33% for ammonia and nitrate, and 90.26% for inorganic phosphorous. The result yields quite optimistic effectivity of the constructed wetland, which may be caused by the assumptions made in the model, which goes through simplification method. It can also be caused by the differences in plants assumption. In the HYDRUS simulation, the plant used is grass, which does not specify what kind of grass. Meanwhile, the physical simulation uses water bamboo.

IOP conference series, Feb 11, 2020

The existence of irrigation in Indonesia is commonly quite influenced by environmental and social... more The existence of irrigation in Indonesia is commonly quite influenced by environmental and social cultural characteristics, which the people have lived by and developed for a long time. Many factors cause changes in the pattern of water availability, which increases competition among stakeholders, as in the Sempor irrigation system area. It has four main dams, which are the Bojong Dam, Watubarut Dam, Rowokawuk Dam, and Sindut Dam; it provides approximately 5900 ha of services and receives supplies from the Great Sempor Dam (38 million m3). Currently there is a decline in the function of this dam due to sedimentation, making operational services less optimal, especially during the dry season. The methodology of this study is to perform water optimization for the balancing of water in the irrigation area. Meanwhile, the implementation of the water supply on the field considers the calculation of water availability, space, and time. In practice, the operation of water supply is held by a group system in the secondary blocks. In certain conditions, the water rotation in tertiary channels was performed by local cultural wisdom.

Jurnal Mahasiswa Jurusan Teknik Pengairan, Aug 8, 2019

ABSTRAK: Pada studi ini, akan membahas tentang neraca air di Sub DAS Lesti Kabupaten Malang denga... more ABSTRAK: Pada studi ini, akan membahas tentang neraca air di Sub DAS Lesti Kabupaten Malang dengan tujuan untuk mengetahui keseimbangan antara nilai ketersediaan air dengan kebutuhan air selama 25 tahun ke depan. Analisa ketersediaan air berasal dari dua sektor yaitu ketersediaan air permukaan yang dihitung dengan mengalihragamkan hujan menjadi debit dengan Metode Thornthwaite Mather dan ketersediaan air bawah permukaan yang berasal dari mata air. Sedangkan untuk perhitungan kebutuhan air dalam studi ini berasal dari enam sektor yakni kebutuhan domestik, non domestik, peternakan, perikanan, pertanian dan industri. Dari hasil analisa didapat rata-rata ketersediaan air Sub DAS Lesti sebesar 1035,59 juta m 3 /tahun. Sedangkan kebutuhan air yang dihitung berdasarkan 2 skenario yaitu skenario satu sebesar 152,60 juta m 3 /tahun dan pada skenario dua sebesar 130,35 juta m 3 /tahun. Dari hasil tersebut didapatkan bahwa ketersediaan air yang ada dapat mencakupi seluruh kebutuhan air di Sub DAS Lesti selama 25 tahun ke depan atau dengan kata lain hal ini menunjukkan keadaan surplus. Kata kunci: Sub DAS Lesti, Thornthwaite Mather, ketersediaan air, kebutuhan air, neraca air. ABSTRACT: In this study, will discuss about water balance in the Lesti Sub-Watershed in Malang Regency. The purpose of this research is to determine the balance between the value of water availability and water requirements for the next 25 years. Analysis of water availability is calculated from two sectors, availability of water surface which is calculated by transferring rain to discharge with the Thornthwaite Mather method, and availability of water subsurface from water springs. Whereas the water requirements is calculated from six sectors, namely domestic demand, non domestic, animal husbandry, fishery, irrigation and industry. From the analysis, average of water availability of the Lesti Sub-Watershed is 1035,59 million m 3 /year. Whereas water reqirements are calculated based on two scenarios, in first scenario is 152,60 million m 3 /year and in second scenario is 130,35 million m 3 /year. From these result it was found that the availability of available water can cover all water requirements in the Lesti Sub-Watershed for the next 25 years or in other word this indicated a surplus situation. Keywords: Lesti Sub-Watershed, Thornthwaite Mather, water availability, water requirements, water balance.

International journal of innovative technology and exploring engineering, Sep 30, 2019

Concrete is as one of building materials that is relatively more used in development. Nowadays, t... more Concrete is as one of building materials that is relatively more used in development. Nowadays, there are more usages of additional materials for increasing the quality of concrete such as coming from gray and plant fiber. There are any kinds of bamboo in Merauke Regency which has not been well used by the society. Bamboo that is planted in Merauke Regency can be used as the alternative additional material of plant fiber and as the changing of steel carcass. This study intends to know the quality of concrete strength by adding plant fiber and bamboo carcass. The methodology consists of experimental method by using the variety of bamboo fiber and carcass. The variety of bamboo fiber is as 0.5% and 1%. The evaluation and analysis of cleft pull strength uses SK-SNI 03-2491-2002, concrete defraction strength uses SK SNI 03-4431-1997, and concrete pressure strength uses SK SNI 03-6429-2000. The samples consists of 30 units with cylindrical shape for cleft pulling strength and concrete pressure strength tests; and 15 units with block shape for concrete fraction strength test. Result shows that bamboo caracass in concrete is significantly affected and it can be seen from the increasing of diffraction strength which the normal concrete is 3.321 MPa and on bamboo carcass type 3 is as 19.925 MPa. However, bamboo carcass type 3 can be used as the changing of steel carcass mainly for non-structural building

This paper studied the effect of roughness coefficient in Synthetic Unit Hydrograph (SUH). The me... more This paper studied the effect of roughness coefficient in Synthetic Unit Hydrograph (SUH). The methodology consisted of formulation of peak discharge, rising curve and recession equation. Results showed that there are forests and some dry fileds, rice fields, real estate etc in the watershed. Forest with many big trees will produce high roughness coefficient, because there are not many rains become to be run off.

U Karst, Sep 7, 2022

Rationalizing rainfall station is important to get an effective and efficient number and distribu... more Rationalizing rainfall station is important to get an effective and efficient number and distribution of rainfall stations. If rationalization isn't carried out, it affect to operating and maintenance costs of rainfall stations and accuracy of data. This study aimed to evaluate existing rainfall station and rationalize rainfall station, so rainfall station's location is evenly distributed. This study is located in Welang watershed with an area 477.78 km2. This research requires rainfall ground data from 9 rainfall stations and CHIRPS satellite rainfall data from Google Earth Engine. The data is tested with consistency, stationary, suitability, and rationalization based on World Meteorological Organization (WMO) standards and Kagan-Rodda method. Later, new rainfall station networks will be obtained with the influence area of rainfall stations suitable to WMO Standard. CHIRPS data is highly suitable with ground data, proven by high NSE, strong correlation, and low relative error, so CHIRPS data can be used for further analysis. According WMO, only 1 rainfall station in Welang watershed has been suitable for WMO standard. Those unsuitable with WMO standards need to be rationalized. Based rationalization results, with average error <10%, Welang watershed requires 4 rainfall stations by maintaining Lawang Station, moving Telebuk to Station B, Selowongko to Station C, and Tutur to Station D. The influence area of recommendation rainfall stations have been suitable to WMO Standards and obtained even distribution rainfall stations. This recommendation are expected to be considered by relevant institutes to move the location of the rainfall station to get more accurate rainfall data.

Jurnal Teknologi dan Rekayasa Sumber Daya Air

The Telomoyo watershed is included in the category of mountainous areas and tropical plains. In t... more The Telomoyo watershed is included in the category of mountainous areas and tropical plains. In term of fulfilling the need for adequate water infrastructure, good quality rain data is needed. The methods that can be used are stepwise rationalization and evaluation based on WMO guidance. The stepwise method is chosen in order to check the correlation between the rainfall data and debit data based on multi-correlated statistics and the WMO guidance are used to complete the minimum requirement of the number of rainfall stations in a watershed according to geographical aspects. It was found that the Telomoyo watershed has met the minimum WMO standards, namely with 9 rainfall stations, but it is still considered irrational due to the uneven distribution of rainfall station as seen from the range of influence in each rainfall station. Meanwhile, from the stepwise analysis, it is found that the combination of 4 rainfall stations is considered rational and meets WMO standards. However, thi...

Jurnal Teknologi dan Rekayasa Sumber Daya Air

Dalam kegiatan perencanaan serta pengembangan sumber daya air, dibutuhkan data hidrologi dengan k... more Dalam kegiatan perencanaan serta pengembangan sumber daya air, dibutuhkan data hidrologi dengan kuantitas dan kualitas data yang akurat. Kualitas data yang dimaksud adalah bahwa data dapat menggambarkan kondisi hidrologi sesuai dengan yang terjadi di lapangan, seperti apakah data hujan berkaitan dengan data debit yang ada. Penyebaran pos stasiun hujan di suatu wilayah serta nilai kerapatannya dapat mempengaruhi tingkat kesalahan rerata suatu data hidrologi. Rasionalisasi kerapatan pos stasiun hujan dan pos duga air dilakukan dengan metode Stepwise dan standar WMO pada Sub DAS Pacal. Data yang digunakan adalah data hujanusebagai variabelibebas dan dataodebit sebagai variabeloterikat dengan panjang data selama 10 tahun. Metode Stepwise ini merupakan metode stastistika yang dapat mengetahui pos hujan mana yang berkorelasi secara signifikan terhadap data debit. Standar WMO dapat mengetahui kebutuhan minimal jumlah pos hujan berdasarkan karateristik geografi suatu daerah. Hasil analisis ...

Jurnal Teknologi dan Rekayasa Sumber Daya Air

Jumlah curah hujan melampaui laju infiltrasi dan penguapan maka akan mengakibatkan limpasan permu... more Jumlah curah hujan melampaui laju infiltrasi dan penguapan maka akan mengakibatkan limpasan permukaan. Hujan dengan kekuatan dan butiran yang besar akan membuat tanah menjadi terkelupas dan akan menyebabkan erosi. Maka penelitian ini bertujuan untuk menganalisi pengaruh dari intensitas hujan yang bervariasi terhadap volume limpasan permukaan dan laju erosi pada alat rainfall simulator. Studi ini dilakukan pada alat rainfall simulator dengan variasi hujan yaitu 0,5 liter/menit, 1,0 liter/menit, 1,5 liter/menit, dan 2,0 liter/menit dengan kemiringan alat rainfall simulator sebesar 5% dan tanpa vegetasi. Metode yang digunakan pada penelitian ini adalah metode Soil Conservation Service (SCS) yaitu untuk mengetahui seberapa besar pengaruh variasi intensitas hujan terhadap volume limpasan permukaan serta menggunakan metode modified universal soill loss equation (MUSLE) untuk mengetahui seberapa besar pengaruh variasi intensitas hujan terhadap laju erosi. Hasil dari hubungan intensitas huj...

Civil and Environmental Science

This study uses ground and CHIRPS data to rationalize the density of rainfall stations in the Jat... more This study uses ground and CHIRPS data to rationalize the density of rainfall stations in the Jatiroto Sub-watershed, Lumajang Regency. This study aimed to determine the suitability of the CHIRPS satellite rainfall data to the measurement data. In addition, it determines the density of rainfall stations based on WMO standards. Also, the Kagan-Rodda method uses measurement and satellite data to determine rainfall station recommendations' results. The method used for the suitability test uses the value of RMSE, NSE, Correlation Coefficient, and Relative Error. And the WMO standard for analyzing the number of rainfall station. Knowing the rationalization and recommendations for placing rainfall stations using the Kagan-Rodda method by considering WMO standards, root mean square error, and interpolation errors. The results obtained include the appropriateness of satellite data, the number of rainfall stations at the research location according to WMO standards, and recommendations f...

Jurnal Teknik Sipil, Nov 10, 2019

Ketelitian data hujan yang tidak akurat sering menyebabkan pengelolaan SDA (sumber daya air) tida... more Ketelitian data hujan yang tidak akurat sering menyebabkan pengelolaan SDA (sumber daya air) tidak berjalan sesuai harapan. Mengingat pentingnya informasi data hujan maka diperlukan kajian rasionalisasi atau perencanaan jaringan stasiun hujan yang efektif dan efisien. Studi ini dilakukan di Sub DAS Lesti dengan luas 378,2 km 2 menggunakan metode WMO (World Meteorogical Organization) dan Kagan-Rodda. Hasil analisa berdasarkan standar WMO 100-250 km 2 /stasiun hujan, hanya 2 dari 5 stasiun hujan yaitu Dampit dan Poncokusumo yang memenuhi standar. Hasil analisa Kagan-Rodda berdasarkan nilai kesalahan perataan 5% adalah Sub DAS Lesti cukup memiliki 3 stasiun hujan. Hasil rasionalisasi dengan titik stasiun acuan Poncokusumo, menghasilkan rekomendasi menggeser stasiun Dampit sejauh 5,9 km ke utara dan membentuk stasiun hujan baru (A) yang berlokasi di sebelah tenggara stasiun hujan Dampit. Hasil rekomendasi tersebut memiliki luas pengaruh yang sesuai standar WMO untuk masingmasing stasiun hujan, yaitu: Poncokusumo 110,8 km 2 , Dampit 156,5 km 2 , dan A 110,9 km 2. Kata kunci: kerapatan pos stasiun hujan; WMO; kagan-rodda

Civil and environmental science journal, Apr 1, 2022

Regression analysis can develop unit hydrograph modeling by approaching the peak discharge (Qp) a... more Regression analysis can develop unit hydrograph modeling by approaching the peak discharge (Qp) and time to peak (Tp) parameters. The main aim of this study is to design a model of peak discharge based on watershed shape factors. The watersheds used in this study are Bontojai Watershed, Jonggoa Watershed, Kampili Watershed, Maccini Sombala Watershed, and Jenelata Watershed, which have slopes criteria below 10% and have complete recorded data of Automatic Water Level Recorder (AWLR) and Automatic Rainfall Recorder (ARR). The validation results of corrected peak discharge data produce Root Mean Squared Error (RMSE). Then, the peak discharge model was conducted by regression analysis and validated with observed unit hydrographs. The results of this study indicate that the coefficient of determination R 2 is 0.963. It means that the independent variable (x), namely the area of the watershed, the length of the main river, and the shape factor of the watershed, influences the peak discharge (Qp) of 96.3%.

Journal of Southwest Jiaotong University, 2021

This research aims to investigate the characteristic of hydrology in the Krukut River. However, i... more This research aims to investigate the characteristic of hydrology in the Krukut River. However, it studies an interesting floodplain like the riparian buffer zone (RBZ). RBZ is close adjacent to the river waters, generally accompanied by shrubs and the other crops along a river. It is useful for stabilizing the streams and minimizing the flood damages. The development of a region will impact the surrounding ecosystem that has been a developed human activity along the river, one of which is the Krukut River. The methodology consists of hydrological analysis for finding the characteristic of hydrology. The hydrology is analyzed using the water discharge data of Krukut River headwater. However, the maximum water discharge frequency is analyzed by using two models that are a) Log Pearson distribution and b) Gumbel distribution. The observations are made during the survey reveal that RBZs and floodplain areas are dominated by human habitation on both banks. The result of the analysis sho...

World applied sciences journal, 2009

This paper studied Synthetic Unit Hydrograph Model. The methodology consisted of analysis of obse... more This paper studied Synthetic Unit Hydrograph Model. The methodology consisted of analysis of observed unit hydrograph and the primary physical parameters of watershed. Results revealed that length of river and area of watershed were the primary physical parameters. Further research is needed focusing on roughness coefficient of the river.

Abstrak . Kebutuhan air domestik dihitung berdasarkan jumlah penduduk dan standar kebutuhan air d... more 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 la...

Civil Engineering Journal, Jul 1, 2023

This research intends to predict the discharge (run-off) from rainfall for which the model is bui... more This research intends to predict the discharge (run-off) from rainfall for which the model is built using W-flow. The research location is in the Gajah Mungkur reservoir (Wonogiri) in Indonesia. The estimation of reservoir inflow has an important role, mainly in the scheme of reservoir operation and management. However, the heterogeneity of complex spatial and temporal patterns of rainfall and also the physiographic context of a watershed cause the development of a model of real-time runoff and rainfall that can accurately predict the reservoir inflow to become a challenge in the development of water resources. In relation to the analysis and prediction of rainfall, the constraint and problem that is still often faced is the minimal availability of observed rainfall data spatially as well as temporally; the time series of rainfall data is not long and complete enough; and the number of rainfall stations is less evenly distributed. The methodology consists of carrying out the literature study, collecting as much rainfall data as possible to build a W flow model, then carrying out the model calibration and analyzing the prediction of real-time reservoir inflow for operation. The result shows that the dependable discharge of the Wonogiri watershed shows that there are two peak discharges, which happened on February II (the second half of February) and December II (the second half of December). However, the discharge is decreasing in July and reaching its lowest level in October II (the second half of October).

Jurnal Teknik Pengairan: Journal of Water Resources Engineering, Sep 18, 2014

Daerah Irigasi Lodoyo mencakup dua wilayah kabupaten yaitu Kabupaten Blitar dan Kabupaten Tulunga... more Daerah Irigasi Lodoyo mencakup dua wilayah kabupaten yaitu Kabupaten Blitar dan Kabupaten Tulungagung. Daerah Irigasi Lodoyo sendiri memiliki intake di Bendungan Wlingi di wilayah Kabupaten Blitar. Bendungan Wlingi terletak pada Sungai Brantas yaitu di Desa Jegu Kecamatan Sutojayan Kabupaten Blitar ± 30 km di hilir Bendungan Sutami. Manfaat dan tujuan yang diharapkan dari dibangunnya Bendungan Wlingi Raya ini adalah untuk penyediaan air irigasi dan membangkitkan PLTA. Areal irigasi DI Lodoyo mempunyai luas baku sawah 12.219 ha yang terdiri 12.204 irigasi dan 15 ha untuk tambak. Jenis tanaman yang ditanam pada areal DI Lodoyo untuk setiap musim tanam adalah : (1)

Jurnal Teknik Pengairan: Journal of Water Resources Engineering, Oct 3, 2014

Penilaian Kinerja Daerah Aliran Sungai menggunakan indikator hidrologi merupakan cara cepat dan e... more Penilaian Kinerja Daerah Aliran Sungai menggunakan indikator hidrologi merupakan cara cepat dan efektif untuk mengetahui kondisi kinerja DAS Konaweha akibat perubahan tata guna lahan yang terjadi. Lokasi studi DAS Konaweha berada di Provinsi Sulawesi Tenggara yang meliputi Kota Kendari, Kabupaten Konawe, dan Kabupaten Kolaka dengan luas DAS ± 6020 km 2. Studi ini dilakukan dengan tujuan untuk mengetahui respon DAS Konaweha terhadap perubahan tata guna lahan di tahun 2000 sampai tahun 2010, serta arahan penggunaan lahan RTRW (Rencana Tata Ruang Wilayah) Provinsi Sulawesi Tenggara menggunakan metode analisis spasial dengan bantuan perangkat lunak AVSWAT. Indikator kinerja DAS yang dipakai dalam indikator penilaian adalah debit untuk mengetahui nilai Koefisien Regim Sungai (KRS), koefisien limpasan, serta angkutan sedimen yang terjadi di DAS Konaweha. Berdasarkan ketiga indikator dan hasil perhitungan analisa spasial ini bisa disimpulkan bahwa DAS Konaweha termasuk dalam Kategori Baik. Nilai KRS yang didapat pada tahun 2000 dan 2010, serta arahan penggunaan lahan RTRW antara 99-102 yang menunjukkan DAS Konaweha dalam kategori sedang. Indikator koefisien limpasan yang dipakai mendapatkan nilai antara 0,045-0,1 yang menunjukkan standar penilaian termasuk dalam kategori baik. Demikian pula indikator angkutan sedimen dengan nilai 0,5-0,105 yang juga menunjukkan DAS dalam kategori baik. Nilai KRS yang termasuk dalam kategori sedang menunjukkan DAS Konaweha mempunyai daya dukung yang kurang baik untuk menyimpan dan menahan air yang ada. Pembangunan bendungan, embung, dan upaya teknis lainnya perlu dilakukan agar dapat meningkatkan kemampuan kinerja DAS Konaweha dalam hal menurunkan nilai Koefisien Regim Sungai (KRS) sehingga mendapatkan skor penilaian yang lebih baik.

Jurnal Teknologi dan Rekayasa Sumber Daya Air, Apr 15, 2021

International journal of GEOMATE : geotechnique, construction materials and environment, Nov 1, 2018

This research studies the hydraulic behavior and the problem solving alternatives of original unt... more This research studies the hydraulic behavior and the problem solving alternatives of original until final design, and the most effective stilling basin and downstream regulator channel for decreasing back water from the upstream water level in the dam foot. The methodology consists of physical modeling in the Laboratory of River and Swamp, Department of Water Resources, Faculty of Engineering, University of Brawijaya. The methods include the USBR for the hydraulic analysis, the Hind's formulation for the side channel analysis, the energy equation by analyzing the standard step for the transition and the chute way analysis, and the USBR type III for designing the stilling basin. A square cross-section with the Manning coefficient of 0.40 is used for determining the control of the Tail Water Level (TWL) and a trapezoidal crosssection with the Manning coefficient of 0.39 is used for the final design. However, the equation of Schotlisch and Veronise is used for the local scouring analysis. The result of Model Test and analysis indicates that there are some differences among the analysis in every point of the building. Therefore, the relative error is needed to know how big the error in the comparison result.

IOP conference series, May 1, 2023

One of the problems involving water bodies is the pollution of water sources, which later becomes... more One of the problems involving water bodies is the pollution of water sources, which later becomes the parent of various social, economic, and health problems. One of these conditions can be overcome by utilizing phytoremediation through constructed wetlands. HYDRUS is a software that offers easy modelling of pollutant decay mechanisms in water bodies and constructed wetlands using finite element method. This study aims to show and analyse how HYDRUS software can model the mechanism in constructed wetland by using finite element method. The parameters observed are the time for the pollutant, namely ammonia, nitrate, and inorganic phosphorous, to reach the outlet, and the response curve of the pollutant loading on the model. From the simulation, it can be inferred that the maximum velocity of the water going through the constructed wetland is 8.11 m/day, or 811 cm/day. The dominating velocity in the wetland is around 160 cm/day, or 1.6 m/day. The response curve of the pollutant transport is also in accordance with theoretical response for impulse loading. The result yields the effectivity of simulated constructed wetland, which are 90.33% for ammonia and nitrate, and 90.26% for inorganic phosphorous. The result yields quite optimistic effectivity of the constructed wetland, which may be caused by the assumptions made in the model, which goes through simplification method. It can also be caused by the differences in plants assumption. In the HYDRUS simulation, the plant used is grass, which does not specify what kind of grass. Meanwhile, the physical simulation uses water bamboo.

IOP conference series, Feb 11, 2020

The existence of irrigation in Indonesia is commonly quite influenced by environmental and social... more The existence of irrigation in Indonesia is commonly quite influenced by environmental and social cultural characteristics, which the people have lived by and developed for a long time. Many factors cause changes in the pattern of water availability, which increases competition among stakeholders, as in the Sempor irrigation system area. It has four main dams, which are the Bojong Dam, Watubarut Dam, Rowokawuk Dam, and Sindut Dam; it provides approximately 5900 ha of services and receives supplies from the Great Sempor Dam (38 million m3). Currently there is a decline in the function of this dam due to sedimentation, making operational services less optimal, especially during the dry season. The methodology of this study is to perform water optimization for the balancing of water in the irrigation area. Meanwhile, the implementation of the water supply on the field considers the calculation of water availability, space, and time. In practice, the operation of water supply is held by a group system in the secondary blocks. In certain conditions, the water rotation in tertiary channels was performed by local cultural wisdom.

Jurnal Mahasiswa Jurusan Teknik Pengairan, Aug 8, 2019

ABSTRAK: Pada studi ini, akan membahas tentang neraca air di Sub DAS Lesti Kabupaten Malang denga... more ABSTRAK: Pada studi ini, akan membahas tentang neraca air di Sub DAS Lesti Kabupaten Malang dengan tujuan untuk mengetahui keseimbangan antara nilai ketersediaan air dengan kebutuhan air selama 25 tahun ke depan. Analisa ketersediaan air berasal dari dua sektor yaitu ketersediaan air permukaan yang dihitung dengan mengalihragamkan hujan menjadi debit dengan Metode Thornthwaite Mather dan ketersediaan air bawah permukaan yang berasal dari mata air. Sedangkan untuk perhitungan kebutuhan air dalam studi ini berasal dari enam sektor yakni kebutuhan domestik, non domestik, peternakan, perikanan, pertanian dan industri. Dari hasil analisa didapat rata-rata ketersediaan air Sub DAS Lesti sebesar 1035,59 juta m 3 /tahun. Sedangkan kebutuhan air yang dihitung berdasarkan 2 skenario yaitu skenario satu sebesar 152,60 juta m 3 /tahun dan pada skenario dua sebesar 130,35 juta m 3 /tahun. Dari hasil tersebut didapatkan bahwa ketersediaan air yang ada dapat mencakupi seluruh kebutuhan air di Sub DAS Lesti selama 25 tahun ke depan atau dengan kata lain hal ini menunjukkan keadaan surplus. Kata kunci: Sub DAS Lesti, Thornthwaite Mather, ketersediaan air, kebutuhan air, neraca air. ABSTRACT: In this study, will discuss about water balance in the Lesti Sub-Watershed in Malang Regency. The purpose of this research is to determine the balance between the value of water availability and water requirements for the next 25 years. Analysis of water availability is calculated from two sectors, availability of water surface which is calculated by transferring rain to discharge with the Thornthwaite Mather method, and availability of water subsurface from water springs. Whereas the water requirements is calculated from six sectors, namely domestic demand, non domestic, animal husbandry, fishery, irrigation and industry. From the analysis, average of water availability of the Lesti Sub-Watershed is 1035,59 million m 3 /year. Whereas water reqirements are calculated based on two scenarios, in first scenario is 152,60 million m 3 /year and in second scenario is 130,35 million m 3 /year. From these result it was found that the availability of available water can cover all water requirements in the Lesti Sub-Watershed for the next 25 years or in other word this indicated a surplus situation. Keywords: Lesti Sub-Watershed, Thornthwaite Mather, water availability, water requirements, water balance.

International journal of innovative technology and exploring engineering, Sep 30, 2019

Concrete is as one of building materials that is relatively more used in development. Nowadays, t... more Concrete is as one of building materials that is relatively more used in development. Nowadays, there are more usages of additional materials for increasing the quality of concrete such as coming from gray and plant fiber. There are any kinds of bamboo in Merauke Regency which has not been well used by the society. Bamboo that is planted in Merauke Regency can be used as the alternative additional material of plant fiber and as the changing of steel carcass. This study intends to know the quality of concrete strength by adding plant fiber and bamboo carcass. The methodology consists of experimental method by using the variety of bamboo fiber and carcass. The variety of bamboo fiber is as 0.5% and 1%. The evaluation and analysis of cleft pull strength uses SK-SNI 03-2491-2002, concrete defraction strength uses SK SNI 03-4431-1997, and concrete pressure strength uses SK SNI 03-6429-2000. The samples consists of 30 units with cylindrical shape for cleft pulling strength and concrete pressure strength tests; and 15 units with block shape for concrete fraction strength test. Result shows that bamboo caracass in concrete is significantly affected and it can be seen from the increasing of diffraction strength which the normal concrete is 3.321 MPa and on bamboo carcass type 3 is as 19.925 MPa. However, bamboo carcass type 3 can be used as the changing of steel carcass mainly for non-structural building

This paper studied the effect of roughness coefficient in Synthetic Unit Hydrograph (SUH). The me... more This paper studied the effect of roughness coefficient in Synthetic Unit Hydrograph (SUH). The methodology consisted of formulation of peak discharge, rising curve and recession equation. Results showed that there are forests and some dry fileds, rice fields, real estate etc in the watershed. Forest with many big trees will produce high roughness coefficient, because there are not many rains become to be run off.

U Karst, Sep 7, 2022

Rationalizing rainfall station is important to get an effective and efficient number and distribu... more Rationalizing rainfall station is important to get an effective and efficient number and distribution of rainfall stations. If rationalization isn't carried out, it affect to operating and maintenance costs of rainfall stations and accuracy of data. This study aimed to evaluate existing rainfall station and rationalize rainfall station, so rainfall station's location is evenly distributed. This study is located in Welang watershed with an area 477.78 km2. This research requires rainfall ground data from 9 rainfall stations and CHIRPS satellite rainfall data from Google Earth Engine. The data is tested with consistency, stationary, suitability, and rationalization based on World Meteorological Organization (WMO) standards and Kagan-Rodda method. Later, new rainfall station networks will be obtained with the influence area of rainfall stations suitable to WMO Standard. CHIRPS data is highly suitable with ground data, proven by high NSE, strong correlation, and low relative error, so CHIRPS data can be used for further analysis. According WMO, only 1 rainfall station in Welang watershed has been suitable for WMO standard. Those unsuitable with WMO standards need to be rationalized. Based rationalization results, with average error <10%, Welang watershed requires 4 rainfall stations by maintaining Lawang Station, moving Telebuk to Station B, Selowongko to Station C, and Tutur to Station D. The influence area of recommendation rainfall stations have been suitable to WMO Standards and obtained even distribution rainfall stations. This recommendation are expected to be considered by relevant institutes to move the location of the rainfall station to get more accurate rainfall data.

Jurnal Teknologi dan Rekayasa Sumber Daya Air

The Telomoyo watershed is included in the category of mountainous areas and tropical plains. In t... more The Telomoyo watershed is included in the category of mountainous areas and tropical plains. In term of fulfilling the need for adequate water infrastructure, good quality rain data is needed. The methods that can be used are stepwise rationalization and evaluation based on WMO guidance. The stepwise method is chosen in order to check the correlation between the rainfall data and debit data based on multi-correlated statistics and the WMO guidance are used to complete the minimum requirement of the number of rainfall stations in a watershed according to geographical aspects. It was found that the Telomoyo watershed has met the minimum WMO standards, namely with 9 rainfall stations, but it is still considered irrational due to the uneven distribution of rainfall station as seen from the range of influence in each rainfall station. Meanwhile, from the stepwise analysis, it is found that the combination of 4 rainfall stations is considered rational and meets WMO standards. However, thi...

Jurnal Teknologi dan Rekayasa Sumber Daya Air

Dalam kegiatan perencanaan serta pengembangan sumber daya air, dibutuhkan data hidrologi dengan k... more Dalam kegiatan perencanaan serta pengembangan sumber daya air, dibutuhkan data hidrologi dengan kuantitas dan kualitas data yang akurat. Kualitas data yang dimaksud adalah bahwa data dapat menggambarkan kondisi hidrologi sesuai dengan yang terjadi di lapangan, seperti apakah data hujan berkaitan dengan data debit yang ada. Penyebaran pos stasiun hujan di suatu wilayah serta nilai kerapatannya dapat mempengaruhi tingkat kesalahan rerata suatu data hidrologi. Rasionalisasi kerapatan pos stasiun hujan dan pos duga air dilakukan dengan metode Stepwise dan standar WMO pada Sub DAS Pacal. Data yang digunakan adalah data hujanusebagai variabelibebas dan dataodebit sebagai variabeloterikat dengan panjang data selama 10 tahun. Metode Stepwise ini merupakan metode stastistika yang dapat mengetahui pos hujan mana yang berkorelasi secara signifikan terhadap data debit. Standar WMO dapat mengetahui kebutuhan minimal jumlah pos hujan berdasarkan karateristik geografi suatu daerah. Hasil analisis ...

Jurnal Teknologi dan Rekayasa Sumber Daya Air

Jumlah curah hujan melampaui laju infiltrasi dan penguapan maka akan mengakibatkan limpasan permu... more Jumlah curah hujan melampaui laju infiltrasi dan penguapan maka akan mengakibatkan limpasan permukaan. Hujan dengan kekuatan dan butiran yang besar akan membuat tanah menjadi terkelupas dan akan menyebabkan erosi. Maka penelitian ini bertujuan untuk menganalisi pengaruh dari intensitas hujan yang bervariasi terhadap volume limpasan permukaan dan laju erosi pada alat rainfall simulator. Studi ini dilakukan pada alat rainfall simulator dengan variasi hujan yaitu 0,5 liter/menit, 1,0 liter/menit, 1,5 liter/menit, dan 2,0 liter/menit dengan kemiringan alat rainfall simulator sebesar 5% dan tanpa vegetasi. Metode yang digunakan pada penelitian ini adalah metode Soil Conservation Service (SCS) yaitu untuk mengetahui seberapa besar pengaruh variasi intensitas hujan terhadap volume limpasan permukaan serta menggunakan metode modified universal soill loss equation (MUSLE) untuk mengetahui seberapa besar pengaruh variasi intensitas hujan terhadap laju erosi. Hasil dari hubungan intensitas huj...

Civil and Environmental Science

This study uses ground and CHIRPS data to rationalize the density of rainfall stations in the Jat... more This study uses ground and CHIRPS data to rationalize the density of rainfall stations in the Jatiroto Sub-watershed, Lumajang Regency. This study aimed to determine the suitability of the CHIRPS satellite rainfall data to the measurement data. In addition, it determines the density of rainfall stations based on WMO standards. Also, the Kagan-Rodda method uses measurement and satellite data to determine rainfall station recommendations' results. The method used for the suitability test uses the value of RMSE, NSE, Correlation Coefficient, and Relative Error. And the WMO standard for analyzing the number of rainfall station. Knowing the rationalization and recommendations for placing rainfall stations using the Kagan-Rodda method by considering WMO standards, root mean square error, and interpolation errors. The results obtained include the appropriateness of satellite data, the number of rainfall stations at the research location according to WMO standards, and recommendations f...

Jurnal Teknik Sipil, Nov 10, 2019

Ketelitian data hujan yang tidak akurat sering menyebabkan pengelolaan SDA (sumber daya air) tida... more Ketelitian data hujan yang tidak akurat sering menyebabkan pengelolaan SDA (sumber daya air) tidak berjalan sesuai harapan. Mengingat pentingnya informasi data hujan maka diperlukan kajian rasionalisasi atau perencanaan jaringan stasiun hujan yang efektif dan efisien. Studi ini dilakukan di Sub DAS Lesti dengan luas 378,2 km 2 menggunakan metode WMO (World Meteorogical Organization) dan Kagan-Rodda. Hasil analisa berdasarkan standar WMO 100-250 km 2 /stasiun hujan, hanya 2 dari 5 stasiun hujan yaitu Dampit dan Poncokusumo yang memenuhi standar. Hasil analisa Kagan-Rodda berdasarkan nilai kesalahan perataan 5% adalah Sub DAS Lesti cukup memiliki 3 stasiun hujan. Hasil rasionalisasi dengan titik stasiun acuan Poncokusumo, menghasilkan rekomendasi menggeser stasiun Dampit sejauh 5,9 km ke utara dan membentuk stasiun hujan baru (A) yang berlokasi di sebelah tenggara stasiun hujan Dampit. Hasil rekomendasi tersebut memiliki luas pengaruh yang sesuai standar WMO untuk masingmasing stasiun hujan, yaitu: Poncokusumo 110,8 km 2 , Dampit 156,5 km 2 , dan A 110,9 km 2. Kata kunci: kerapatan pos stasiun hujan; WMO; kagan-rodda

Civil and environmental science journal, Apr 1, 2022

Regression analysis can develop unit hydrograph modeling by approaching the peak discharge (Qp) a... more Regression analysis can develop unit hydrograph modeling by approaching the peak discharge (Qp) and time to peak (Tp) parameters. The main aim of this study is to design a model of peak discharge based on watershed shape factors. The watersheds used in this study are Bontojai Watershed, Jonggoa Watershed, Kampili Watershed, Maccini Sombala Watershed, and Jenelata Watershed, which have slopes criteria below 10% and have complete recorded data of Automatic Water Level Recorder (AWLR) and Automatic Rainfall Recorder (ARR). The validation results of corrected peak discharge data produce Root Mean Squared Error (RMSE). Then, the peak discharge model was conducted by regression analysis and validated with observed unit hydrographs. The results of this study indicate that the coefficient of determination R 2 is 0.963. It means that the independent variable (x), namely the area of the watershed, the length of the main river, and the shape factor of the watershed, influences the peak discharge (Qp) of 96.3%.

Journal of Southwest Jiaotong University, 2021

This research aims to investigate the characteristic of hydrology in the Krukut River. However, i... more This research aims to investigate the characteristic of hydrology in the Krukut River. However, it studies an interesting floodplain like the riparian buffer zone (RBZ). RBZ is close adjacent to the river waters, generally accompanied by shrubs and the other crops along a river. It is useful for stabilizing the streams and minimizing the flood damages. The development of a region will impact the surrounding ecosystem that has been a developed human activity along the river, one of which is the Krukut River. The methodology consists of hydrological analysis for finding the characteristic of hydrology. The hydrology is analyzed using the water discharge data of Krukut River headwater. However, the maximum water discharge frequency is analyzed by using two models that are a) Log Pearson distribution and b) Gumbel distribution. The observations are made during the survey reveal that RBZs and floodplain areas are dominated by human habitation on both banks. The result of the analysis sho...

World applied sciences journal, 2009

This paper studied Synthetic Unit Hydrograph Model. The methodology consisted of analysis of obse... more This paper studied Synthetic Unit Hydrograph Model. The methodology consisted of analysis of observed unit hydrograph and the primary physical parameters of watershed. Results revealed that length of river and area of watershed were the primary physical parameters. Further research is needed focusing on roughness coefficient of the river.

Abstrak . Kebutuhan air domestik dihitung berdasarkan jumlah penduduk dan standar kebutuhan air d... more 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 la...