Studi Pemisahan Aliran Dasar Metode Local Minimum Method Daerah Aliran Sungai Miu

The two main elements of a river flow hydrograph are direct runoff and baseflow. Base flow is a flow that comes from groundwater and it is available during the rainy and dry seasons. Information of baseflow value of a watershed has an important meaning in efforts to develop and manage water resources, including the provision of clean water, irrigation systems, flood management and others. Miu watershed located in Sigi Regency often experiences natural disasters such as floods and droughts that occur almost every year, which is the research location with an area of 65,452.01 Ha. This study aims to determine the value of baseflow using the Local Minimum Method and to find out whether this method can be used for baseflow modeling in research watersheds. This study was conducted using Hydro Office software with input data in the form of daily discharge data from 2004 to 2013. The average baseflow value obtained was 5.43 m3/s. The process of calibrating the baseflow value by taking flow data in the dry season where there is no rainfall input. It is obtained that BFI have value an average of 0.89. This value indicates that the Miu watershed has high storage permeability characteristics, The Miu watershed has quite stable flow during dry periods, because the greater the BFI value, the better the water supply in a watershed. In the statistical test, the observed discharge is the discharge data from the measurement results for the period 2004-2013, while the calculated discharge is the result of the estimated base flow value obtained using the graphical method. From the results of the statistical test of RMSE and R2, the RMSE value was 0.147 and the R2 value was 0.751. Both statistical tests show that the local minimum method has a fairly good performance in modeling the base flow in the Miu watershed.

Analisis Hidrologi dan Hidraulika pada Bangunan Pelimpah (Studi Kasus: Bangunan Pelimpah Bendungan Tugu)

Perencanaan desain hidraulik bangunan pelimpah merupakan bagian yang penting dalam desain bendungan terutama bendungan urugan. Penelitian ini bertujuan untuk melakukan simulasi aliran pada bangunan pelimpah Bendungan Tugu menggunakan bantuan program HEC-RAS kemudian membandingkannya dengan Detailed Engineering Design (DED). Simulasi ini dilakukan sebagai dasar untuk menganalisis kemampuan bangunan pelimpah Bendungan Tugu dalam mengalirkan debit outflow yang dihitung menggunakan program HEC-HMS. Hasil simulasi HEC-RAS menunjukkan bahwa pelimpah Bendungan Tugu mampu mengalirkan debit outflow perencana dengan baik namun masih terjadi limpasan pada saluran akhir. Simulasi HEC-HMS memberikan nilai debit banjir rancangan untuk Q1000 dan QPMF masing-masing adalah 820 m3/s dan 1161,2 m3/s. Hasil ini lebih tinggi dari debit banjir rancangan perencana 670,95 m3/s untuk Q1000 dan 928,44 m3/s untuk QPMF. Sehingga, dilakukan perubahan pada lebar pelimpah menjadi 45 m, lebar saluran menjadi 40 m, serta meninggikan tanggul +2 m pada saluran pengarah serta saluran akhir. Hasil simulasi aliran pada bangunan pelimpah dengan desain yang telah dimodifikasi menggunakan HEC-RAS menunjukkan bahwa tidak terjadi limpasan pada pelimpah, sehingga fungsi bangunan pelimpah dapat berjalan dengan baik.

Analysis of Air Side Needs at Mutiara SIS AL-JUFRI Airport Palu

The city of Palu is the capital of the province of central Sulawesi which has hajj waiting list 0f around 31,384 pilgrims with a qouta of 1986 pilgrims until 2034. Garuda indonesia has prepared four tipes of air craft that will serve these filghts including Boeing B777-300ER, B747-400, A330-300 and A330-200. In this study use the secondary data for the next 10 and 20 years forcasting uses the econometric method. The data needed includes climatology, passenger and air craft characteristic at Mutiara Al Jufri Airport. The standard refers to the ICAO. Based on the calculation result obtained that in the exixting condition, the length and width of the runway is 2,510 x 45 m and the width of taxiway is 23 m and the dimension of the apron are 373 x 311,2 m. In 2027, the length of the runway will be 3786 m with a width of 45m, and the width of taxiway 23 m. Apron dimension 541,5 x 195,5 m2. In 2037, the dimension of the runway and taxiway are still fixed, but the apron dimension changes to 714 x 195,5 m. Keywords: Mutiara Sis Al-Jufri Palu Airport, Runway, Taxiway, Apron

Analisis Hidrograf DAS Poso dengan Metode Hidrograf Satuan Sintetis Snyder dan Hidrograf Satuan Sintetis Soil Conversation Service (SCS)

The Poso River is a river located in Poso Regency, Central Sulawesi Province, which has a length of 74.58 km, and watershed area of 1092.810 km2. Energy in the Poso River is used for hydroelectric power plant (PLTA). With the construction of the Poso hydropower plant, maximum flood discharge data is needed for the prevention of Poso hydro power plant safety. In calculating the flood discharge, the method used is a synthetic unit hydrograph. Synthetic unit hydrograph is a graph of the relationship between flow rate (Q) and time (t). In this study, the method used to calculate the designed flood discharge is the Snyder synthetic unit hydrograph method and the Soil Conversation Service (SCS) synthetic unit hydrograph. The aims of this study are to determine the largest flood discharge value and to determine the hydrograph shapes of the two methods. The parameters that will be obtained from both methods are peak time (Tp), base time (Tb) and peak discharge (Qp). From the analysis it can be found that in the Snyder SUH method, the peak time (Tp) is 12.616 hours, the base time (Tb) is 67.276 hours with a peak discharge (Qp) of 21.672 m3sec. Whereas in the SCS SUH method, the peak time (Tp) is 10.954 hours, the base time (Tb) is 57.268 hours with a peak discharge (Qp) of 20.751 m3/sec. The result demonstrates the result that the largest flood discharge has occurred in the Snyder SUH method.

Pengetahuan Masyarakat dalam Melakukan Rekonstruksi Rumah Tinggal Pasca Gempa di Kabupaten Donggala

Gempa adalah suatu kejadian alam yang tidak bisa dihindari mengakibatkan banyaknya bangunan yang rusak, konstruksi bangunan memainkan peran penting dalam proses pembangunan disetiap daerah, dalam hal ini pengetahuan masyarakat saat membangun kembali rumah sangat penting untuk diketahui. Penelitian ini bertujuan mengindentifikasi pengetahuan masyarakat dalam melakukan rekonstruksi rumah tinggal pasca gempa. Metode yang digunakan dalam penelitian ini adalah dengan cara penyebaran kuesioner kepada masyarakat yang terdampak bencana khususnya di Desa Marana sebanyak 80 kepala keluarga. Analisis data menggunakan statistik deskriptif, uji reliabilitas, Relative Rank Index (RRI) dan korelasi Spearman’s Rho. Hasil penelitian menunjukkan bahwa variabel dominan masyarakat dalam melakukan rekonstruksi rumah tinggal adalah mengetahui cara memperbaiki tulangan pada dinding pemikul dengan nilai RRI sebesar 0,820, mengetahui cara memperbaiki tulangan pada kolom dengan nilai RRI sebesar 0,800, mengetahui jenis campuran untuk kolom dengan nilai RRI sebesar 0,780, mengetahui perbandingan campuran beton untuk kolom dengan nilai RRI sebesar 0,760, mengetahui tulangan yang baik digunakan untuk kolom dengan nilai RRI sebesar 0,740. Adapun hubungan antara variabel dominan tertinggi adalah perilaku masyarakat dalam mengetahui cara memperbaiki tulangan pada dinding pemikul berkorelasi dengan mengetahui cara memperbaiki tulangan pada kolom, memperoleh nilai tertinggi yaitu 0,672 termasuk kedalam kriteria korelasi kuat.

Analisis Hubungan Kecepatan Rerata Terhadap Kecepatan Permukaan Untuk Penentuan Kekasaran Dasar Pada Aliran Saluran Terbuka

Kecepatan aliran suatu tampang saluran dapat digunakan untuk menentukan nilai n-Manning, dimana nilai n-Manning merupakan koefisien yang merepresentasikan kondisi kekasaran hidraulik suatu penampang saluran. Dikarenakan tidak mudahnya menentukan nilai n- Manning secara akurat di lapangan, pada penelitian ini dilakukan analisis hubungan antara kecepatan aliran rerata tampang (U) dengan kecepatan aliran titik (u(bi,dj)) dengan d = 0.0D; 0.1D; 0.2D dan 0.6D untuk penentuan nilai n-Manning pada suatu tampang saluran, dimana bi adalah koordinat lebar saluran, dj adalah koordinat kedalaman aliran, D adalah kedalaman aliran. Pertama-tama dilakukan analisis rasio antara kecepatan aliran rerata tampang (U) terhadap kecepatan aliran titik (u(Vi,dj)) untuk beberapa jenis kondisi saluran yang disebut nilai koefisien k; nilai tersebut dianalisis pada beberapa posisi pengukuan arah transversal saluran, b/B. Jenis saluran yang digunakan terdiri dari saluran alami/sungai (Sungai Opak bagian tengah, Sungai Opak bagian hulu, Sungai Kuning), Saluran Mataram berbelok, Saluran Mataram tidak seragam, Saluran Laboratorium Berbelok, dan Saluran Laboratorium lurus. Hasil analisis nilai k tersebut selanjutnya digunakan untuk perhitungan nilai n-Manning. Hasil perhitungan nilai n-Manning tersebut selanjutnya dibandingkan dengan nilai n- Manning dari hasil perhitungan rumus empirik. Hasil nilai k yang diperoleh pada d = 0.0D; 0.1D; 0.2D dan 0.6D untuk data di tepi saluran (b/B = 0,25) rentang nilai yang dihasilkan lebih besar dibandingkan rentang nilai k di tengah saluran (b/B = 0,50). Nilai k pada bagian tengah saluran nilai yang dihasilkan lebih stabil atau relatif sama di semua jenis saluran yang ditentukan. Nilai n-Manning berdasarkan nilai k dan rumus empirik rentang nilai yang dihasilkan cukup dekat, khususnya untuk data di sungai dan Saluran Mataram. Sedangkan untuk data di saluran laboratorium nilai n-Manning berdasarkan rumus empirik lebih kecil dibandingkan nilai n-Manning berdasarkan nilai k.

Analisis Ketersediaan Air Waduk Gadjah Mungkur dengan Adanya Pembangunan Intake dan Jaringan Pipa Trasmisi Wosusokas

Gadjah Mungkur Reservoir is one of the multipurpose reservoirs built by damming the flow of the Bengawan Solo River. The Gadjah Mungkur Reservoir has existed for a long time with the main purpose of controlling flooding, but over time, this reservoir is also useful as a hydropower plant, irrigation, and also to meet the raw water needs of Wonogiri City. The potential of the Gadjah Mungkur Reservoir itself in meeting the needs of drinking water is an essential function in the people’s life around the reservoir. Therefore, the expansion of the scope of providing drinking water can be used to develop the potential of the Gadjah Mungkur Reservoir. This coverage expansion was realized through the construction of the Wosusokas intake and transmission pipeline network to drinking water receiving areas, namely Wonogiri, Sukoharjo, Solo, and Karanganyar, with service coverage of drinking water access resepectively ±78,38, ±70,97%, ±81,85%, and ±70,97%. This study aims to analyze the water availability of the Gadjah Mungkur Reservoir with additional coverage for drinking water services. The method used is a simple reservoir routing calculation by processing secondary data obtained in the form of inflow, outflow, and reservoir storage characteristics. The results of the analysis show that elevation variations with the construction of the Wosusokas intake and transmission pipeline have an annual average of +132,56 m in 2017, with a reservoir storage volume reaching 216,27 MCM and +134,29 m in 2018, with a reservoir storage volume reaching 284,92 MCM. However, there are some elevation values that exceed +138,0 m, namely at February to March 2018. However, overall, the results of the analysis show that the Wosusokas construction can increase the potential utilization of the Gadjah Mungkur Reservoir without endangering the reservoir with water level fluctuations that can still be controlled and in accordance with the regulation of reservoir water level.

Pemodelan Resiko Kecelakaan Berbasis Kondisi Kendaraan dan Pengemudi

Traffic accidents are particularly prone to occur mainly caused by vehicle speed, vehicle damage, alcohol influence, and fatigue. The study aims to model the risk of vehicle and driver-based accidents occurring across Queensland, Australia. The data in this study used a dataset of accident factors on Queensland state roads totaling 3412 accidents sourced from the Australian state government of Queensland. Research data period from 2001-2019. This research method uses multinomial logistic regression modeling analysis. The results of this study produced several models, namely; (1) Log odds in the risk level of death vs hospitalization will increase by 1,028 if affected by vehicle damage, increase by 0.731 if affected by fatigue, increase by 0.158 if affected by vehicle speed, increase by 0.151 if influenced by alcohol. (2) Log opportunities in the risk level of death vs. medical care will increase by 0.786 if affected by vehicle damage, increase by 0.375 if affected by fatigue, decrease by 0.003 if affected by vehicle speed, decrease by 0.078 if influenced by alcohol. (3) Log odds in the risk of death vs minor injury will increase by 0.484 if affected by vehicle damage, increase by 0.245 if affected by fatigue, decrease by 0.156 if affected by vehicle speed, decrease by 0.266 if influenced by alcohol. (4) Log odds in the risk of death vs property damage will increase by 1,254 if affected by vehicle damage, increase by 0.828 if affected by fatigue, increase by 0.185 if influenced by vehicle speed, increase by 0.128 if influenced by alcohol. The validation test value with crosstab method explains that the accuracy result of level 1 has an accuracy value of 0.99 and inaccuracy of 0.01 then the result of level 2 to level 5 has an accuracy value of 1.

Analisis Kompetensi Kerja Tukang Plester di Kota Palu

One effort to empower the implementation of construction projects in order to maintain the quality of the final work is the application of competency standards for workers who hold a strategic position in determining the quality of the final building, in this case plaster workers. The aims of this research was to know the application of plasterer competency standards based on the Indonesian National Work Competency Standards (SKKNI) on building projects in Palu City. This research was conducted on plasterers of buildings in the city of Palu. The research method used was literature study, the primary data collection was done by distributing the questionnaires. The selected respondents were plasterers. Data were processed by using descriptive statistical methods and using the Relative Rank Index (RRI). The results showed that the application of plasterers' work competency standards based on SKKNI was around 80% to 90% which had been well implemented, namely, carrying out Preparation of Plastering Work, Carrying Out Plaster Mixing Mixes, Carrying Plaster Work. In addition, around 20% to 30% have not been well implemented, namely, the use of PPE and WSE, Making Job Reports.

Daya Dukung Tanah Pasir Dengan Perkuatan Geotekstil Tipe UW 150 Terhadap Variasi Lebar Fondasi dan Perkuatan

Tanah pasir adalah tanah yang memiliki daya dukung yang rendah serta lebih dipengaruhi oleh kepadatan tanah. Oleh sebab itu perlu dilakukan perbaikan tanah pasir untuk dapat meningkatkan daya dukung tanah pasir. Salah satu metode perbaikan tanah secara mekanis yaitu dengan menyisipkan lembar perkuatan (geotekstil) pada tanah pasir tersebut. Tujuan dari penelitian ini adalah mengkaji hubungan lebar fondasi (B) dan lebar perkuatan (Br) dalam meningkatkan daya dukung tanah berpasir serta mengetahui daya dukung tanah pasir pada kondisi tanpa dan dengan perkuatan. Penelitian ini bertujuan untuk mengetahui pemodelan pada tanah pasir dalam bak uji yang terbuat dari plat baja berukuran 80 cm x 80 cm dengan model pondasi dangkal berukuran 8 cm x 8 cm, 10 cm x 10 cm dan 12 cm x 12 cm. Pembebanan diberikan dengan menggunakan alat hydraulic jack. Tanah dibentuk dengan kerapatan relatif 50% dan lebar perkuatan (Br) yang disisipkan berukuran 4B, 5B dan 6B dengan kedalaman (u) 0,5B, spasi(z) 0,25B dan jumlah perkuatan(N) 3 lembar, dimana B adalah lebar pondasi. Selanjutnya, ditentukan daya dukung batas dan rasio daya dukungnya (BCR). Hasil penelitian memperlihatkan bahwa pemberian lembar geotekstil dapat meningkatkan daya dukung pada tanah pasir terhadap kondisi tanpa perkuatan. Daya dukung semakin meningkat bila lebar pondasi (B) semakin besar serta lebar perkuatan (Br) atau geotekstil semakin besar. Daya dukung terbesar berdasarkan teori Tangent Intersection Method diperoleh pada lebar pondasi (B) 12 cm x 12 cm dan lebar perkuatan (Br) 6B sebesar 153 kN/m2 dengan rasio daya dukung sebesar 2,06. Untuk teori vesic daya dukung terbesar diperoleh pada lebar pondasi (B) 12 cm x 12 cm 274 kN/ m2 untuk lebar perkuatan 6B dengan rasio daya dukung (BCR) sebesar 3,32.