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Pontan, Darmawan
Universitas Trisakti
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Analisis Pengaruh Curve Number terhadap Debit BanjirMenggunakan Metode Pemodelan Hidrologi di DAS Juana: Analysis Curve Number Influence on Flood Discharge using Hydrological Modeling in Juana Watershed Komara, Kresna Dwiki; Kurniyaningrum, Endah; Rinanti, Astri; Yuwono, Bambang Endro; Pontan, Darmawan
Technomedia Journal Vol 9 No 3 (2025): February
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/tmj.v9i3.2296

Abstract

This research aims to investigate the effect of Curve Number (CN) on flood discharge in the Juana watershed. Using a case study approach, analysis was carried out to understand the relationship between CN values and hydrological characteristics and flood risk in the region. The research method involves hydrological modeling which takes into account the CN value as a key parameter. Spatial and temporal data on land cover, soil type and vegetation are used to determine CN values in various land change scenarios. The study results indicate a trend of increasing Curve Number (CN) values in 5 Subwatersheds, a decrease in 2 Subwatersheds, and no change in 1 Subwatershed. The highest increase in CN value was observed in the Juana 2 Subwatershed, with an increase of (+) 0.935, while the largest decrease was found in the Gembong Subwatershed, with a decrease of (-) 0.349. Both the increase and decrease in CN values are directly proportional to the resulting flood discharge. These findings have important implications for disaster risk management, regional planning, and sustainable policy development in the Juana River Basin and similar regions worldwide. By understanding more deeply the influence of CN on flood discharge, more effective mitigation measures can be designed to protect communities and ecosystems that are vulnerable to flood threats.
Analysis of Risk Factors of HPS in Goods and Services Procurement for Jakarta Property Projects: Mitigasi Risiko HPS Berbasis Digital pada Pengadaan Proyek Properti Gandhi, Iswara; Pontan, Darmawan; Inavonna, Inavonna; Kusumawati, Lili
Technomedia Journal Vol 10 No 1 (2025): June
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/tmj.v10i1.2459

Abstract

The procurement of goods and services for property projects in Jakarta faces various challenges, primarily due to inaccuracies in the Self-Estimated Price (HPS), which lead to significant risks in cost, time, and quality. This study seeks to identify the dominant risk factors caused by HPS inaccuracies and propose effective strategies to mitigate their impact on property project procurement. The research uses the Analytical Hierarchy Process (AHP) method, with 54 respondents involved, to evaluate three key risk categories: cost, time, and quality, based on the effects of HPS inaccuracies. The study finds that these inaccuracies undermine budget efficiency, cause delays in procurement processes, and negatively impact the quality of goods or services received. Cost-related risks include document instability and unforeseen expenses, while time-related risks involve delays and frequent revisions of the HPS. Quality-related risks stem from the use of substandard materials and the failure to meet project specifications. To mitigate these risks, the study proposes updating the HPS with up-to-date market data, conducting regular price surveys, enhancing the skills of procurement teams, adopting digital technologies such as e-procurement systems, and improving supplier selection processes. These strategies aim to improve procurement efficiency, enhance project quality, and ensure cost-effectiveness, ultimately leading to better project outcomes.
Evaluasi Tingkat Kepuasan Pengguna Fasilitas Pejalan Kaki di Jalan Kyai Tapa Grogol Rahman, Naufall Fadhlur; Pontan, Darmawan; Kurniyaningrum, Endah; Inavonna, Inavonna
Jurnal Locus Penelitian dan Pengabdian Vol. 4 No. 6 (2025): JURNAL LOCUS: Penelitian & Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v4i6.4474

Abstract

Penelitian ini bertujuan untuk mengevaluasi tingkat kepuasan pengguna terhadap fasilitas pejalan kaki di Jalan Kyai Tapa, Grogol, yang merupakan salah satu jalur pedestrian penting dan padat aktivitas. Permasalahan utama yang dihadapi di jalur ini adalah keberadaan pedagang kaki lima (PKL) dan parkir liar yang mengurangi ruang pejalan kaki, sehingga menurunkan kenyamanan dan keselamatan pengguna. Penelitian ini menggunakan metode Importance Performance Analysis (IPA) dengan data primer yang diperoleh melalui penyebaran kuesioner kepada pengguna jalur pedestrian. Hasil analisis menunjukkan hanya 33% dari fasilitas eksisting yang dinilai sudah cukup baik, sehingga ini mengindikasikan tingkat kepuasan yang masih rendah sehingga masih banyak aspek yang perlu ditingkatkan. Penelitian ini mengidentifikasi lima variabel utama yang memengaruhi kepuasan pengguna, yaitu keselamatan dan keamanan, kenyamanan, kesetaraan, kemudahan dan aksesibilitas, serta keindahan. Selain itu, melalui diskusi kelompok terarah (Focus Group Discussion), ditemukan tiga indikator tambahan yang turut memberikan pengaruh signifikan terhadap kepuasan pengguna. Hasil ini diharapkan dapat menjadi masukan dalam perencanaan dan peningkatan fasilitas pejalan kaki yang lebih humanis dan terintegrasi.
Implementasi Konsep Net Zero Healthy Pada Bangunan Sekolah Antoni, Febri; Kusumawati, Lili; Kurniyaningrum, Endah; Pontan, Darmawan; Widiarso, Tulus
Jurnal Locus Penelitian dan Pengabdian Vol. 4 No. 6 (2025): JURNAL LOCUS: Penelitian & Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v4i6.4268

Abstract

This study aims to evaluate the implementation of the Net Zero Healthy (NZH) concept in a total school rehabilitation project in DKI Jakarta Province, as an effort to develop energy-efficient buildings that also promote physical health and thermal comfort for occupants. Employing a qualitative case study approach, data were collected through in-depth interviews, field observations, document analysis, and questionnaires from building users. The results indicate that solar panels effectively supplied 15% of the school’s total energy needs, although constrained by regulations. Furthermore, all working spaces met the minimum standards for natural ventilation and daylighting based on ASHRAE and Indonesian national standards. Mechanical ventilation through fans also performed optimally, supplying fresh air significantly above the required minimum. These findings demonstrate that NZH principles can be effectively applied to public building projects by considering design, technology, and user behavior. This research contributes significantly to green building policy development and national emission reduction efforts.
Pengolahan Sampah Terpadu Dengan Konsep Waste To Energy Di Smart City IKN Rose, Ugahari; Kusumawati, Lili; Kurniyaningrum, Endah; Pontan, Darmawan; Widiarso, Tulus
Jurnal Locus Penelitian dan Pengabdian Vol. 4 No. 6 (2025): JURNAL LOCUS: Penelitian & Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v4i6.4269

Abstract

In the context of the development of Indonesia’s new capital city in East Kalimantan, waste management presents increasingly complex challenges. Due to limited existing infrastructure, unintegrated waste management can lead to groundwater contamination, vegetation cover degradation, and threats to local biodiversity. This study aims to evaluate the implementation of an integrated waste treatment system combined with Waste to Energy (WtE) technology in the Capital City Area. Data were collected through direct observation and interviews with relevant stakeholders to measure the operational performance of the system. Field measurements included emissions analysis, energy production, and waste volume reduction. Based on a 15-day observation period in December 2024, thermal treatment produced only 2.97% residue. Assuming the operation of a single incinerator unit and limited waste supply, waste can be converted into electrical energy (Waste to Energy) with a power output of 195.169 watts. It can be concluded that by operating two incinerator units under the current conditions, the energy output could be doubled to 390.338 watts.
Water Availability in the Moayat River in Meeting Water Needs in Kotamobagu, North Sulawesi Mokodongan, Masita Aisza; Kurniyaningrum, Endah; Yuwono, Bambang Endro; Pontan, Darmawan
IAIC Transactions on Sustainable Digital Innovation (ITSDI) Vol 6 No 2 (2025): April
Publisher : Pandawan Sejahtera Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34306/itsdi.v6i2.689

Abstract

The Moayat River in Kotamobagu, North Sulawesi, plays an important roleas a water source to meet the needs of the local community. However, water management in this area faces significant challenges due to seasonal discharge fluctuations, changes in land cover, and increasing water demand. This study aims to analyze the water availability of the Moayat River based on surface water conditions and current water demand assessments, future water demand projections, and water balance evaluations. The results show that current water availability is sufficient to meet domestic water needs. However, surface water conditions are influenced by climate change indicators, so that river discharge approaches the water demand threshold, thus creating a risk of water shortages,especially for irrigation. Over the past decade, forest cover in the catchment area has decreased, which has led to increased surface runoff and reduced water infiltration. Based on these findings, climate change in land cover greatly affects surface flow conditions so that an integrated management strategy is needed, including watershed rehabilitation, development of water storage infrastructure, and increasing water use efficiency, is essential to ensure the long-term sustainability of water supply from the Moayat River.
Analysis of Implementation Time Performance Using Earned Value Method Pontan, Darmawan; Daniel, Daniel; Pentagon, Pentagon; Manisha, Manisha; Sumeru, Indrawati
Journal La Multiapp Vol. 6 No. 5 (2025): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v6i5.2456

Abstract

Construction projects often face cost and time constraints, while projects are required to be completed on schedule. To overcome these problems, an accurate management system is needed in a construction project to measure time performance, which refers to the progress of the work. By applying the earned value management (EVM) method, it is possible to project progress and weekly performance indices, making it easier to evaluate when there are deviations from the schedule. This study aims to analyze schedule variations and weekly time productivity, enabling the prediction of when the project will be completed. In the construction project of the Faculty of Law Building at Samratulangi University in North Sulawesi Province, reviews were conducted in weeks 1, 5, 10, 11, 20, and 25, where each review period had different CV, SV, and CPI values, allowing to assess at which time the predicted time was closest to the actual time occurring on-site.
Software Based Geotechnical Analysis of Spillway Slope Reinforcement Fabyanto, Ikhsan; Zaki, Muhammad; Pontan, Darmawan; Widiarso, Tulus
Technomedia Journal Vol 10 No 2 (2025): October
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/zzgyr313

Abstract

The construction of large-scale infrastructure such as dams requires precise planning and implementation to ensure structural stability and long-term operational safety. This study aims to analyze slope protection and embankment reinforcement at the spillway excavation area of the Dam Project in Surian District, located in the 137 km-long Cipunagara River Basin. A quantitative approach was applied, using geotechnical modeling software Plaxis 8.6 and Microsoft Excel for data processing. Three slope reinforcement methods were compared: geomat, shotcrete, and cocomesh. Based on the analysis, slope reinforcement using shotcrete achieved the highest safety factor, with short-term SF = 1.649 (34.50% increase) and long-term SF = 1.514 (23.49% increase). Geomat ranked second with SF = 1.544 (25.94%) and 1.418 (15.66%), while cocomesh obtained SF = 1.540 (25.61%) and 1.355 (10.52%). The unreinforced slope had an SF of 1.226. In terms of cost, shotcrete was the most expensive at IDR 4,331,068,967.23, followed by geomat (IDR 2,734,025,024.50) and cocomesh (IDR 906,745,000.00). However, shotcrete also required the longest construction time (30 days) compared to geomat (20 days) and cocomesh (16 days). Shotcrete provides the best technical performance for slope stability, but geomat and cocomesh are more efficient alternatives in terms of cost and time, offering a balanced solution for slope reinforcement projects.
Potensi Penghematan Biaya Dan Waktu Konstruksi terhadap Detail Engineering Design (DED) di RSPAD Gatot Soebroto Hartanty, Dyah Widya Dwi; Yuwono, Bambang Endro; Pontan, Darmawan; Inavonna, Inavonna
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i4.57749

Abstract

Indonesia sebagai negara berkembang terus berupaya memenuhi kesejahteraan rakyat dengan berbagai pembangunan infrastruktur. Namun, banyak proyek konstruksi mengalami masalah yang menyebabkan keterlambatan dan pembengkakan biaya, seringkali disebabkan oleh desain yang kurang matang. Penelitian ini bertujuan untuk mengevaluasi potensi penghematan biaya dan waktu dalam proyek Gedung Proton Beam RSPAD Gatot Soebroto Jakarta, dengan mengidentifikasi jenis tanah pada tahap Detail Engineering Design (DED) sebelum pelaksanaan konstruksi. Metode yang digunakan dalam penelitian ini adalah analisis data sekunder dari proyek, yang dibandingkan antara kondisi kesalahan desain yang terjadi saat konstruksi dan kondisi di mana desain diubah sebelum konstruksi dimulai. Temuan menunjukkan bahwa dengan mendeteksi jenis tanah lebih awal, penghematan biaya mencapai 50% dan penghematan waktu sebesar 150% dari yang diperkirakan. Implikasi dari penelitian ini memberikan wawasan penting bagi perencana dan pelaksana proyek untuk memperhatikan aspek geoteknik dalam tahap perencanaan, sehingga dapat meminimalisir risiko dalam proyek konstruksi.
Analisis Keputusan Pemilihan Vendor pada Proyek Infrastruktur Kawasan Ibu Kota Negara (IKN) dengan Menggunakan Metode Rank Order Centroid (ROC) dan Simple Multi Attribute Rating TechniquE (SMART) Mahatmantong, Syafrullah; Moengin, Parwadi; Kurniyaningrum, Endah; Pontan, Darmawan
Syntax Literate Jurnal Ilmiah Indonesia
Publisher : Syntax Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/syntax-literate.v10i7.60497

Abstract

Di era pembangunan infrastruktur sekarang ini, kebutuhan akan vendor semakin meningkat. Vendor sebagai pihak penyedia sangat berperan penting dalam menentukan kualitas produk dan kelancaran proses konstruksi. Maka dari itu perusahaan perlu selektif dalam memilih vendor sebagai mintra bisnis. Pemilihan vendor sangat penting dilakukan oleh perusahaan untuk meningkatkan rantai pasok dan mendapatkan kualitas mutu produk yang baik. Oleh karena itu perusahaan perlu melakukan penilaian dan pemilihan terhadap kinerja dari setiap vendor. Proyek-proyek di Kawasan IKN merupakan proyek yang pengerjaannya dilakukan percepatan dari waktu yang ditentukan, sehingga perlu suatu strategi yang matang dalam merencanakan pengadaan material. Pengadaan material menjadi hal penting dalam keberlangsungan proyek, maka dari itu dibutuhkan strategi yang cepat dan tepat dalam pemilihan vendor untuk men-supply material yang dibutuhkan dalam pelaksanaan. Tujuan dari penelitian ini yaitu membuat strategi pemilihan vendor dengan pendekatan pengambilan keputusan menggunakan metode kombinasi Rank Order Centroid (ROC) untuk menghitung bobot kriteria dan Simple Multi Attribute Rating Technique (SMART) untuk menentukan alternatif terpilih. Metode penelitian ini dilakukan dengan penyebaran kuesioner untuk menentukan kriteria prioritas berdasarkan pendapat dari para expert judgment. Dari hasil pengolahan kuesioner diperoleh bahwa dari 13 kriteria hasil studi literature diperoleh 7 kriteria prioritas dalam pemilihan vendor, yang dilakukan perhitungan pembobotan kriteria dengan metode ROC, yang secara berurutan yaitu: kriteria Kualitas (37,04%), Harga (22,76%), Responsif (15,61%), Reputasi Perusahaan (10,85%), Metode Pembayaran (7,28%), Pengiriman (4,42%) dan Layanan (2,04%). Dan dari hasil pengolahan data juga diperoleh vendor terpilih dengan metode SMART untuk pengadaan Girder tipe I yaitu PT. Adhimix PCI, pengadaan Girder tipe U yaitu PT. Adhimix PCI, dan pengadaan baja tulangan BjTS 420B yaitu: PT. Buana Baja.
Co-Authors Abadan, Achmad Chakim Abidin, Dikky Safitra Adnan Muhtaram Alexander Alexander Alfa Nur Alim Alfa Nur Alim Alim, Alfa Nur Alsion Maxsi Ananda Maulana Yusuf Andre Tampubolon Antoni, Febri Aulia Najah Bambang Endro Yuwono Berman, Berman Bhekti, Dhanu Setyo Bruantama, Daffa Miln Chandra Gemilang Chandra Pramodya Gemilang Christianto Christianto Cindy Sangadji Daniel Daniel Daniel Mundung Dicky Darmawan Diski Kholida Zia Hadie Putri Efa Ayu Nabila Endah Kurniyaningrum Fabyanto, Ikhsan Fadli Rahman Al Ghifari Fatchurrohman Fatchurrohman, Fatchurrohman Fawwaz, Arvyant Arrazaqi Feby Kartika Sari Galih Prio Sujagat Gandhi, Iswara Gemilang, Chandra Pramodya Hartanty, Dyah Widya Dwi Heru Pambudi Hevada T, Laska Hot Maruli Tua Frans Marihot Purba Ilham Akbar Mulya Wibawa Imam Muhammad Fikri, Imam Muhammad Inavonna Inavonna Inavonna Inavonna, Inavonna Indrawati Sumeru Innavona Innavona Intan Yulianisa Irawan, Angga Ananda Isma Fajar Komara, Kresna Dwiki Lahji, Khotijah Lili Kusumawati Lili Kusumawati Lunatari Sanbella M Yusuf D Adiwinata Mahatmantong, Syafrullah Manisha Rucitawangi Manisha, Manisha Martinus Bambang Susetyarto Maryati, Indah Melkysedek, Hobert Mangatur Michella Maria Veronika Mokodongan, Masita Aisza Muhammad Anugrah Wibawa Mukti Muhammad Anwar Muhammad Fikri, Imam Muhammad Zaki Muhammad Zaki Nesya Widiastama Nugroho, Muhammad Sapto Nyoman Oka Wahyudhi Parwadi Moengin Pentagon Chen Pentagon, Pentagon Rahman, Naufall Fadhlur Rose, Ugahari Saihul Anwar Saihul Anwar Sari, Feby Kartika Septia, Zahara Ajeng Setyo Bhekti, Dhanu Silvano, Verian Gustam Sri Novianthi Pratiwi Sugeng Riyanto Sugeng Riyanto Sujagat, Galih Prio Sumeru, Indrawati Suradjin Sutjipto Sutjipto, Suradjin Syamsiar, Syamsiar Syifa Aulia Putri Tulus Widiarso Ulfa Fatmasari Faisal Wijasena, Razaq Agung Zahara Ajeng Septia Zaki, M.