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Penelusuran Limpasan Kejadian Banjir Sungai Padolo Di Kota Bima Akson Nurhanafi; Istiarto; B. Yulistyanto
Seminar Nasional Insinyur Profesional (SNIP) Vol. 1 No. 1 (2021): Prosiding SNIP Vol.1 No.1
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (157.006 KB) | DOI: 10.23960/snip.v1i1.87

Abstract

Kota Bima mengalami banjir besar tanggal 21 dan 23 Desember 2016. Banjir berasal luapan Sungai Padolo dan Sungai Melayu. Sungai Padolo memberikan dampak banjir yang lebih besar dibandingkan Sungai Melayu. Penelusuran banjir di Sungai Padolo bertujuan mengetahui karakteristik sungai terhadap kejadian banjir dan membandingkan kondisi awal sebelum banjir dan pasca banjir. Sehingga perlu dilakukan penelusuran hidraulik untuk mendapatkan data profil muka air atau debit sepanjang ruas sungai. Simulasi pemodelan banjir dilakukan dengan menggunakan alat bantu perangkat lunak (software) HEC-RAS. Tipe aliran yang dipergunakan dalam simulasi HEC-RAS dapat berupa aliran permanen (steady flow) dan aliran tidak permanen (unsteady flow). Hasil penelusuran diharapkan dapat memberi informasi yang dapat dipertimbangkan dalam melaksanakan desain mitigasi yang sudah dan akan dilaksanakan. Analisa hidrologi menunjukkan beban hujan pada tanggal 21 Desember 2016 berada pada rentang kala ulang 25 sampai dengan 50 tahun. Simulasi HEC-RAS menunjukkan pada 21 Desember 2016 debit Sungai Pedolo dan anak sungai Sadia memberikan pengaruh banjir yang relatif sama terhadap kejadian banjir, sedang pada tanggal 23 Desember 2016 anak Sungai Sadia memberikan beban banjir dominan dibandingkan dengan Sungai Pedolo. Kapasitas maksimum Sungai Pedolo aadalah 64.5 mᶟ/det, diambil berdasarkan kemampuan penampang Sta. 556 di Kelurahan Paruga yang sudah penuh (fullbank capacity) pada debit tersebut. Penempatan saluran pengelak di Sungai Pedolo mampu mengurangi sejumlah titik perlu perhatian dan melimpas. Pengaruh rata-rata penurunan jumlah lokasi penampang titik lokasi melimpas sebanyak 43%. Penempatan tanggul pada Sungai Sadia mampu mengalirkan debit banjir kala ulang 25 tahunan.
MENGENAL BERBAGAI MODEL HIDROLOGI DI INDONESIA Yulius Patrisius Kau Suni; Istiarto
Eternitas: Jurnal Teknik Sipil Vol 2 No 2 (2023): ETERNITAS : Jurnal Teknik Sipil, Vol 2, No 2 April 2023
Publisher : Program Studi Teknik Sipil Universitas Katolik Widya Mandira

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30822/eternitas.v2i2.2442

Abstract

The hydrological model is a simplification of the complexity of a real-world hydrological system of a watershed. Since 1890, various hydrological models have been developed to assist decision makers in formulating watershed management scenarios. This study examines nine hydrological models through a literature review. The nine models are HydroOffice BFI+, HEC-HMS, HEC-SSP, EPA-WMOST, EPA-AGWA, EPA-SWMM, AGNPS, ANSWERS, and ANFIS. The results of the study are briefly explained as follows. Flood analysis could apply one of the tools namely HEC-HMS, AGWA, SWMM, AGNPS, ANSWERS, and ANFIS. However, certain flood analysis programs need to be combined with GIS and HEC-SSP to get an adequate analysis. Baseflow separation analysis could use BFI+ with the daily rainfall as input data. Analysis of the rate of erosion and sedimentation could apply AGWA, AGNPS, ANSWERS. The HEC-SSP model provides assistance in correcting incomplete and inconsistent data. In terms of water resource management on a watershed scale, the WMOST and AGNPS models can be used. However, some types of models have limitations. Therefore, in applying the model, it is necessary to combine several models to get optimal results. In addition, the results of the hydrological model analysis need to be confirmed by field measurements
Alternative Method for Determining Manning's Roughness Coefficient Using Two-Point Velocity in Equilibrium and Nonequilibrium Sediment Transport Maini, Miskar; Kironoto, Bambang A.; Rahardjo, Adam P.; Istiarto
Civil Engineering Journal Vol. 11 No. 7 (2025): July
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-07-02

Abstract

Understanding flow resistance equations, such as Manning’s roughness equation, is essential for river design and improvement. Estimating Manning’s roughness coefficient becomes more complicated when sediment transport is involved. This study takes an alternative approach by using velocity profiles to examine how sediment transport affects Manning’s roughness coefficient. To achieve this goal, 1200 velocity profiles with sediment-feeding (SF) and non-sediment-feeding (NSF) flows are evaluated to determine the (composite) Manning’s roughness coefficient. Sediment-feeding flows describe sediment flow under equilibrium conditions, whereas non-sediment-feeding flows represent sediment flow under nonequilibrium conditions. A Sontek 16-MHz Acoustic Doppler Velocimeter is used to measure the velocity (and turbulence) profiles. In addition to the present data, 225 secondary velocity profile data sets are analyzed in this study. The research findings indicate that the composite Manning’s roughness coefficient nco can be determined from Manning’s roughness coefficient nz/B at z/B in the transversal direction, using two points of the velocity profile at y/H = 0.2 and 0.4 in the vertical direction. The differences in the velocity profile shape (u/U) due to sediment feeding, particularly in inner regions (y/H ≤ 0.2), affect the value of nz/B. nco for sediment-feeding flows are generally higher than the cross-section Manning roughness coefficient n. As nco (based on nz/B) is based on the velocity profile, the nco values change with sediment transport. Meanwhile, the n values remain unchanged because the equation variables cannot detect the presence of sediment transport. For non-sediment-feeding flow, the differences in nco with n are 14.80% for a fixed bed (FB) and 18.17% for a movable bed (MB). The differences are even more pronounced for sediment-feeding flow at 33.01% for a fixed bed and 36.52% for a movable bed. The point where nz/B/nco = 1 occurs at z/B = 0.2 from the channel sidewall. This suggests that nz/B, measured at z/B = 0.2 from the channel sidewall, provides a good representation of nco for the section.
Establishing Semantok Reservoir Operation Rules to Obtain the Highest Crop Intensity in Semantok Irrigation Area Santosa, Rizky Ramadhani Anwar; Pratiwi, Endita Prima Ari; Istiarto
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.11669

Abstract

The Indonesian government is improving food security by building water infrastructure, including 61 dams for agricultural irrigation. Semantok Dam, one of these projects, serves Daerah Irigasi (D.I.) Semantok (1906 ha). However, long‐term inflow data is still lacking and the reservoir operation rules are still under development. This research aims to develop Semantok reservoir operating rules to maximize cropping intensity. Rainfall‐runoff simulation was conducted using the F.J. Mock method. Calibration (2017–2019) and verification (2020–2023) resulted in optimal parameters with minimum volume error, which were then applied to full‐period F.J. Mock simulations (1999–2023). The resulting simulated inflows was used to calculate irrigation water requirements using the Net Field Requirements  method for two cropping patterns: double cropping of rice‐secondary crops and quadruple cropping onion. The reservoir operating rules were optimized for wet, normal, and dry years (probability exceeding 35%, 50%, and 65%). This study examined cropping intensity under various hydrological conditions. Cropping Pattern (CP) I achieved 300%, 281%, and 242%, while CP II achieved 400%, 400%, and 374% in wet, normal, and dry years, respectively. Future research should optimize water allocation at the sub D.I. level to improve irrigation efficiency and agricultural profitability.
Analysis Of Factors Causes Of Work Fatigue On Employees Washing Motor Vehicles In Sub-District Of North Samarinda Rahmatullah, Ilham; Noberta; istiarto
KESMAS UWIGAMA: Jurnal Kesehatan Masyarakat Vol 8 No 2 (2022): December
Publisher : Universitas Widya Gama Mahakam Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/kujkm.v8i2.1915

Abstract

Kelelahan kerja adalah masalah yang harus diperhatikan secara serius disemua jenis pekerjaan, hal ini yang menyebabkanhilangnya efisiensi, penurunan produktivitas dan kapasitas seseorang dalam bekerja. Tujuan Penelitian: Menganalisis faktorwaktu kerja, masa kerja, beban kerja dan sikap kerja dengan kelelahan yang dialami oleh karyawan pencucian kendaraan bermotor. Metode dalam penelitian ini menggunakan metode kualitatif, pendekatan yang digunakan studi kasus dengan teknikwawancara pada 7 orang informan, yaitu 5 orang karyawan pencucian kendaraan bermotor, 1 orang pelanggan, dan 1 orangpemilik tempat pencucian kendaraan roda dua. Hasil penelitian diperoleh bahwa waktu kerja yang fleksibel dan tidak terikat dapat menyebabkan kelelahan, masa kerja mempunyai pengaruh terhadap terjadinya kelelahan, beban kerja internal dan eksternal dapat menyebabkan kelelahan, sikap kerja duduk, berdiri, membungkuk, dan jongkok jika dilakukan secara monoton dapatmenyebabkan kelelahan. Kesimpulan saran penelitian ini, diharapkan karyawan pencucian kendaraan bermotor melakukanperjanjian jam kerja untuk menyisihkan waktu istirahat, waktu makan, dan ibadah minimal 30 menit setiap 4 jam bekerja, melakukan peregangan otot minimal 5-15 menit sebelum melakukan pekerjaan agar otot tubuh tidak terlalu lama dalam keadaan statis.
Analisis Teknis Sistem Proteksi Kebakaran di Pasar Segiri Kota Samarinda: Analisis Teknis Sistem Proteksi Kebakaran di Pasar Segiri Kota Samarinda alyasari, claudia nur; Suwignyo; istiarto
KESMAS UWIGAMA: Jurnal Kesehatan Masyarakat Vol 9 No 1 (2023): June
Publisher : Universitas Widya Gama Mahakam Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/kujkm.v9i1.2070

Abstract

Abstract Background: The market is one of the public facilities that often experiences fires because it has a high density of occupants and goods so that fires can have an impact on the area around the market. Objectives: The purpose of this study was to find out the technical fire protection system in Segiri Market, Samarinda City. Research Metodes: Uses a qualitative method with a descriptive approach. This research was conducted at Segiri Market. Informant selection technique with purposive sampling, amounting to 4 people and data collection techniques with interviews, observation, and documention. Results: There are no emergency response procedures, site completeness such as a water source in the form of the Karang Mumus River whivh is behind the market, there are 2 environmental road access points, namely the main route with a width of ± 10 m and the mosque route with a width of ± 5 m and there are  bend with a width of ±2.5 m, there are no yard hydrants and gathering points.  Then active and passive protection systems are not available and no means of exit are provided at the Segiri Market. Conclusion: Make fire emergency response procedures, pay attention to environmental road access, namely the width of the bend in the mosque lane with a minimum requirement of 4 m, 54 yard hydrants, provide assembly points with provisions of 0.3 m2/person, active and passive protection systems such as  306 dry chemical powder fire extinguishers, 250 sprinklers and building hydrants connected to the sprinkler. Then providing fire alarms with 60 manual call points, replacing building materials with gypsum materials and carrying out fire resistance tests as well as providing 4 access exit facilities with evacuation route signs Keywords: Fire, Market, Active and Passive Protection Systems
Hazard Factor Identification And Efforts To Control Work Accidents In Welding Activities In Tanks (Confined Space) At PT. Menubar Kaltim istiarto; Wesi Fatmawati
KESMAS UWIGAMA: Jurnal Kesehatan Masyarakat Vol 9 No 2 (2023): December
Publisher : Universitas Widya Gama Mahakam Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/kujkm.v9i2.2676

Abstract

Background: Hazard factors and risks on ships, especially in welding activities in tanks (confined space) there are hazard and risk factors that cannot be avoided by workers. Metode yang digunakan dalam penelitian ini adalah metode kualitatif dengan pendekatan fenomenologi melalui teknik wawancara, observasi, dan dokumentasi terhadap 6 informan, 3 informan utama dan 2 informan pendukung 1 informan kunci. From the results of research through interviews, it can be known that hazard factors, especially in welding activities in the tank (confined space) there are 17 potential hazards with 19 levels of risk and the impact of each category level including 0 risks being included in the low category, 6 risks of being included in the moderate category, 7 risks being included in the high category, 6 other risks are. There are still workers who do not comply with the importance of work safety, some workers actually know that the hazard factors around them are very risky but workers still carry out unsafe behaviour, forget to use personal protective equipment, do not check first, incomplete equipment and damaged equipment as well as worker awareness in equipment maintenance and maintenance of workplace areas. Objectives : This research aims analayze hazard factor and work accident control efforts in tanks welding activities (confined space) at PT. Menubar Kaltim Research Metodes: The type of research used is qualitative which is a research method carried out with the main aim of giving an objective picture of a situation (Notoatmodjo, 2012). The research design used in this study is by phenomenological approach method. The approach is a study that describes phenomena that occur and can be observed. This study is for (data presentation) and conclucion (verification). Findings: Based on the results of interviews conducted by researchers with main informants, supporting informants, key informants, about hazard factors and efforts to control work accidents in welding activities in tanks (confined space) at PT. MK. The main informants in this study were 3 welding workers in the tank (confined space), 1 safetyman and 1 person in charge of the machine in a limited space as a supporting informant who also conducted supervision in the work area (hot work, confined space) and 1 person as a key informant, namely the supervisor. The main information in this study is that each informant has different knowledge due to the experience of workers while working as regulated according to Law Number 11 concerning Job Creation in 2020 and Undung-Law Number 1 of 1970 concerning work safety. Conclusion: Welding activities in tanks (confined space) have a very high level of work accident risk for welding workers in ship tanks. Welding activities in tanks (confined space) at PT. Menubar Kaltim has all levels of risk categories, namely low, moderate, high to extremely high. The results obtained from data analysis using JSA and RA to determine the results on welding activities in tanks (confined space) 17 potential hazards with 19 risk levels of risk and 0 risk levels of low, 6 moderate, 7 high, 6 extremely high.
Co-Authors Akson Nurhanafi alyasari, claudia nur B. Yulistyanto Endita Prima Ari Pratiwi Kironoto, Bambang A. Miskar Maini Noberta Rahardjo, Adam P. Rahmatullah, Ilham Santosa, Rizky Ramadhani Anwar Suwignyo Wesi Fatmawati Yulius Patrisius Kau Suni