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All Journal Teknisia G-Tech : Jurnal Teknologi Terapan Indonesian Community Journal JITU (Jurnal Ilmiah Teknik Unida) Journal of Community Service JOMPA ABDI: Jurnal Pengabdian Masyarakat Jurnal Ekonomi dan Bisnis JUSTER: Jurnal Sains dan Terapan Journal of Comprehensive Science STORAGE: Jurnal Ilmiah Teknik dan Ilmu Komputer Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Pengabdian Masyarakat Bangsa Masyarakat: Jurnal Pengabdian
Anggi Hermawan
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Flood Modeling Analysis of the Cokroyasan Watershed in Bayan District, Purworejo Regency Using HEC-RAS Software Muhammad Rizky Fajar; Sely Novita Sari; Anggi Hermawan
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7393

Abstract

Floods are a frequent natural disaster in Indonesia. Heavy rainfall and poor watershed management make the Cokroyasan River Basin (DAS), Bayan District, Purworejo Regency, especially susceptible. The purpose of this study is to analyze the flood inundation area and calculate the peak discharge in the Cokroyasan Watershed using satellite rainfall data and the Digital Elevation Model (DEM). The study calculates the highest water flow during floods using the Nakayasu Synthetic Unit Hydrograph (HSS) method and examines the water flow with HEC-RAS and ArcGIS to create maps showing areas that could flood. The results showed that, using the Log Pearson Type III distribution, the design rainfall for a 25-year return period with a flow coefficient of 0.288 was 117.6711 mm. The maximum flood discharge, as determined by the Nakayasu HSS, was 1684.028 m³/second. Hydraulic analysis was able to map the region of floods based on land cover, covering 16,200 km² in total. 4,961 km² were covered the low flood depth category (0–1 m), 3,175 km² the medium inundation (1–3 m), and 8,061 km² the high inundation (>3 m). The results of the simulation might lead to a more effective approach for managing and reducing the danger of flooding.
Hydrographic Analysis of Oyo Hilir River Flood using SCS-CN Method with HEC-HMS and HEC-RAS 6.6 Integrated Modeling Endah Theresya; Anggi Hermawan; Andrea Sumarah Asih
G-Tech: Jurnal Teknologi Terapan Vol 10 No 2 (2026): G-Tech, Vol. 10 No. 2 April 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i2.9280

Abstract

The Oyo Hilir River in Bantul Regency is an area with a high level of flood vulnerability due to rainfall intensity, changes in land use, and river morphological characteristics. Repeated flooding events have an impact on community activities in downstream areas. This study aims to analyze the flood discharge of the Oyo Hilir River design and map the distribution and area of the flood-affected area based on the classification of inundation depth. The research was conducted on the Oyo Watershed (DAS) with a focus on the downstream segment of the river along ±14 km, starting from the confluence of the Oyo–Urang River to the Oyo–Opak River. The data used included rainfall for the period 2004–2023, Digital Elevation Model (DEM), and data on the characteristics of supporting watersheds. Hydrological analysis was carried out through rainfall frequency analysis using AProb and flood hydrographic modeling using the Soil Conservation Service–Curve Number (SCS-CN) method on HEC-HMS, which was then used as an input for two-dimensional hydraulic modeling using HEC-RAS version 6.6. The results showed that the peak discharge of the flood at the 2-year return period was 307.6 m³/second with a peak time at the 16th hour. The largest affected area is in Selopamioro Village, Imogiri District, with an inundation area of 323.62 ha dominated by high flood depth (>3 m). The results of this study are expected to be the basis for flood mitigation planning and sustainable management of the Oyo Hilir River.
Identification of Occupational Health and Safety of Formwork Using the Job Safety Analysis Method of Building Construction Projects Regita Gusttriana; Sely Novita Sari; Anggi Hermawan
G-Tech: Jurnal Teknologi Terapan Vol 10 No 1 (2026): G-Tech, Vol. 10 No. 1 January 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i1.8834

Abstract

Formwork in construction projects has a high level of risk to worker safety due to heavy material handling, equipment use, and activities at height. This study will investigate potential hazards in formwork through Job Safety Analysis (JSA) and assess the effectiveness of risk control based on the Hierarchy of Control, which includes elimination, substitution, engineering control, administrative control, and the use of personal protective equipment (PPE). Data collection was executed via on site observations, evaluation of project K3 documentation, and conversations with safety officers, supervisors, and associated workers. The results of the analysis indicated that risk control was more applied to engineering control (55.1%), administrative control (20.4%), and the use of PPE (20.4%). Meanwhile, of substitution (4.08%) and elimination (0%) are still very low. This condition shows that the control with the highest level of effectiveness has not been maximized, so the potential risk of accidents remains high. The findings emphasize the value of implementing top-level controls from the planning and design stages of the project. The use of Hierarchy of Control-based Job Safety Analysis has proven to be a systematic approach in determining risk control priorities and improving occupational safety management. Thus, the results of this study provide strategic recommendations for construction projects in minimizing accidents and building a more effective safety culture.
Analisis Rencana Anggaran Biaya dan Penjadwalan Pembangunan Gedung Paud di Kelurahan Kalirejo Payungan, Dandi Pramono; Sari, Sely Novita; hermawan, anggi
Jurnal Ilmiah Teknik Unida Vol. 4 No. 1 (2023): Juni
Publisher : Mitra Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55616/jitu.v4i1.575

Abstract

Meningkatnya kebutuhan masyarakat akan pembanguna menjadi pemicu semakin pesatnya perkembangan pembangunan di berbagai sektor. Salah satu sektor pembangunan yang terus dilakukan berada di bidang pendidikan khususnya pembangunan gedung paud. Faktor biaya dan estimasi waktu pembangunan juga menjadi bahan pertimbangan utama dimana menyangkut keberhasilan suatu proyek dan meminimalisir adanya resiko kegagalan. Metode penelitian yang digunakan pada penelitian ini adalah metode penelitian deskriptif yaitu dengan mewawancarai langsung pihak bersangkutan dan juga data yang diperoleh dari observasi langsung di lapangan. Dilakukan juga beberapa studi literatur dengan memanfaatkan analisa yang lebih mendalan yang diwujudkan dengan pengolahan data yang lebih fokus serta menyeluruh. Berdasarkan analisa rencana anggara biaya dan penjadwalan yang dilakukan dapat disimpulkan bahwa biaya yang dibutuhkan untuk pembangunan gedung paud di Kelurahan Kalirejo adalah Rp. 255,563,000,00 (Dua Ratus Lima Puluh Lima Juta Lima Ratus Enam Puluh Tiga Ribu Rupiah) dan memerlukan waktu 91 hari kerja dengan waktu awal pengerjaan 1 April 2024 dan waktu penyelesaian 29 Juni 2024.
Analisis Perbandingan Biaya Pembangunan Rumah Konvensional 1 Lantai Tipe 40 Menggunakan AHSP 2016 dan AHSP 2022 (Studi Kasus : Rumah di Triharjo, Kabupaten Sleman) Nurcahyani, Dian; Sari, Sely Novita; hermawan, anggi
Jurnal Ilmiah Teknik Unida Vol. 4 No. 1 (2023): Juni
Publisher : Mitra Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55616/jitu.v4i1.577

Abstract

Proyek konstruksi bangunan rumah adalah suatu struktur fisik yang dibangun untuk tempat tinggal. Rencana Anggaran Biaya (RAB) merupakan salah satu kompenen utama dalam melaksanakan suatu proyek konstruksi karena merupakan dasar acuan untuk mengetahui estimasi biaya yang akan dikeluarkan dan dasar untuk membuat sistem pembiayaan. Penyusunan RAB memiliki beberapa komponen yaitu uraian pekerjaan, harga satuan, volume pekerjaan, upah kerja, material bahan bangunan, dan total biaya keseluruhan. Harga satuan pekerjaan berpedoman pada Analisis Harga Satuan Pekerjaan (AHSP) yang diatur dalam PERMEN PUPR. Penggunaan acuan masa berlaku AHSP harus menyesuaikan dengan waktu penyusunan RAB. Tujuan penelitian ini adalah membahas perbandingan biaya rumah konvensional 1 lantai tipe 40 menggunakan AHSP 2016 dan AHSP 2022. Metode penelitian yang digunakan adalah deskriptif yaitu mewawancarai langsung pihak pelaksana dan data yang diperoleh dari observasi langsung di lapangan. Metode analisis pada penelitian ini yaitu dengan menghitung volume pekerjaan, menghitung harga satuan, mengalikan volume pekerjaan dengan koefisien harga satuan, merekapitulasi RAB, dan menganalisis perbandingan total biaya akhir. Berdasarkan analisa RAB yang dilakukan maka dapat disimpulan bahwa selisih biaya pembangunan rumah konvensional 1 lantai tipe 40 dengan acuan AHSP 2016 dan AHSP 2022 menggunakan SHBJ 2020 adalah sebesar Rp113.000, sedangkan selisih menggunakan SHBJ 2022 adalah sebesar Rp74.000.
Co-Authors Afredo Tubur, Hasi Alwarizi, Fahrol Andrea Sumarah Asih Andrea Sumarah Asih Ardian, Oggi Heical Bagus Gilang Pratama, Bagus Gilang Chandra Wahyu Herbyanto Dandi Pramono Payungan Dian Nurcahyani Endah Theresya Erwin Nur Afiato Filipus Alfriyadi Junaidi Khalid S Ridwan Kota, Reynaldus Sean Muhammad Hanif Jufri Muhammad Rizky Fajar nico siliansyah Novandri Kusuma Wardana Nurcahyani, Dian Oggi Heical Ardian Oggi Heicqal Ardian Payungan, Dandi Pramono Putri Jea, Maria Carvallo Rahmatullah Gafar kahar Regita Gusttriana Rizal Maulana Rizal Maulana, Rizal Rizky Tri Astuti Rizqi Prastowo Sely Novita Sari Siswahyudianto Sogar, Aris Umbu Soru Veno Sholitha Yobel, Felix Yudi Yudi Dwi Kurniawan