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All Journal Journal of Social Science Journal of Social Research COMSERVA: Jurnal Penelitian dan Pengabdian Masyarakat International Journal of Hydrological and Environmental for Sustainability TRANSPUBLIKA INTERNATIONAL RESEARCH IN EXACT SCIENCES (TIRES) Acitya Wisesa: Journal of Multidisciplinary Research INJURITY: Journal of Interdisciplinary Studies Jurnal Teknik Indonesia Journal of Social Science Enrichment: Journal of Multidisciplinary Research and Development International Journal of Social Science and Community Service
Esti Wulandari
Universitas 17 Agustus 1945 Surabaya
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering 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 Physics Public Health Social Sciences Transportation Other

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Cost Analysis of Additional Rainfall Station in The Kayan River Area, North Kalimantan Province Fadzil Abdillah; Hanie Teki Tjendani; Esti Wulandari
Enrichment: Journal of Multidisciplinary Research and Development Vol. 3 No. 10 (2026): Enrichment: Journal of Multidisciplinary Research and Development
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/enrichment.v3i10.606

Abstract

With a total area of the Kayan River Basin (WS) reaching 3,178,215.72 hectares, when compared to other River Basins in Kalimantan, the Kayan WS only has seven rain gauge stations, of which six are in good condition and one is damaged or inactive. Therefore, it is important to determine the appropriate rationalization method in order to obtain the appropriate number and distribution of rain gauge stations and can represent the characteristics of the area in the Kayan River Basin. The method used to analyze the rationalization of these rain gauge stations includes determining the maximum need, minimum need, and the Kagan-Rodda method. After evaluating several methods, the most suitable method for rationalizing rain stations in the Kayan WS is the Kagan-Rodda method. The results of the evaluation of the need for rain stations in the Kayan River Basin are 33 (thirty-three) stations, the existing rain stations are 6 (six) stations, the need for the addition of 27 (twenty-seven) new rain stations.
Analisis Banjir Rancangan Metode HSS Laksono-Erub Laksono Djoko Nugroho; Esti Wulandari; Ony Frengky Rumihin; Tisno Subroto
COMSERVA : Jurnal Penelitian dan Pengabdian Masyarakat Vol. 5 No. 9 (2026): COMSERVA: Jurnal Penelitian dan Pengabdian Masyarakat
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/comserva.v5i9.3512

Abstract

Prediksi banjir rancangan yang akurat merupakan kebutuhan mendasar dalam perencanaan infrastruktur pengendalian banjir dan manajemen sumber daya air. Penelitian ini bertujuan untuk membandingkan akurasi empat metode Hidrograf Satuan Sintetik (HSS) dalam memprediksi debit banjir rancangan di DAS Plumbon, Kabupaten Semarang, yakni metode HSS Nakayasu, Snyder, Gama I, dan Laksono-Erub, serta mengidentifikasi metode yang memberikan penyimpangan terkecil terhadap data debit observasi. Penelitian ini menggunakan pendekatan kuantitatif komparatif dengan data curah hujan harian maksimum tahunan periode 2010-2020 dari tiga stasiun hujan di sekitar DAS Plumbon (Stasiun Mangkang, Kaligawe, dan Gunungpati), serta data debit observasi dari Bendung Plumbon periode yang sama. Hasil penelitian menunjukkan bahwa metode HSS Laksono-Erub memberikan akurasi tertinggi dengan nilai RMSE = 8,45 m³/detik, MAPE = 12,3%, dan R² = 0,89, diikuti oleh metode Gama I (RMSE = 11,72 m³/detik, MAPE = 16,8%, R² = 0,82), Nakayasu (RMSE = 15,31 m³/detik, MAPE = 21,5%, R² = 0,74), dan Snyder (RMSE = 18,96 m³/detik, MAPE = 25,7%, R² = 0,68). Metode Laksono-Erub secara konsisten menunjukkan penyimpangan terkecil untuk semua kala ulang, dengan selisih rata-rata 10-15% terhadap debit observasi. Temuan ini mengonfirmasi bahwa metode Laksono-Erub, yang dikalibrasi berdasarkan karakteristik DAS di Jawa Utara dan Madura, memiliki aplikabilitas yang baik untuk DAS Plumbon yang memiliki karakteristik fisiografis serupa. Penelitian ini memberikan rekomendasi praktis bagi perencana dalam memilih metode HSS yang tepat untuk analisis banjir rancangan di wilayah dengan karakteristik DAS serupa, serta memperkuat basis validasi empiris metode Laksono-Erub di luar lokasi pengembangan aslinya.
Analysis of Clean Water Distribution Pipe Implementation Time Using Value Engineering Method in Rungkut Industri Surabaya Ahmad Rois; Esti Wulandari; Jaka Purnama
Jurnal Teknik Indonesia Vol. 5 No. 1 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i1.796

Abstract

Clean water distribution infrastructure projects in industrial areas face significant challenges related to cost efficiency and implementation time, which directly impact project sustainability and operational effectiveness. This study analyzes the cost and time efficiency of the clean water distribution system in the Rungkut industrial area, Surabaya, by applying the Value Engineering (VE) method. The main objective of this study is to evaluate and compare the performance of three commonly used types of pipes—namely HDPE (High-Density Polyethylene), uPVC (unplasticized polyvinyl chloride), and GI (galvanized iron)—to determine the most optimal alternative without reducing the function or quality of the clean water distribution system. Data collection was conducted through a combination of methods: distributing questionnaires to professional respondents in civil engineering and water installation fields, conducting direct interviews with project-related parties, and analyzing technical documents and costs from actual projects. The obtained data were analyzed using the Relative Importance Index (RII) method to assess key aspects such as cost efficiency, ease of installation, and material durability. The results showed that HDPE pipes offer superior cost and time efficiency compared to the others. The cost difference between HDPE and uPVC pipes is Rp1,407,577, while that with GI pipes is Rp731,885. In terms of time, HDPE pipes can reduce implementation duration by up to 39 days compared to uPVC pipes and by 9 days compared to GI pipes.
Analysis Cost Implementation Using Erection Method in Bridge Construction Malo District – Bojonegoro David Himawan Susetya; Esti Wulandari; Andi Patriadi
Jurnal Teknik Indonesia Vol. 5 No. 2 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i2.798

Abstract

The construction of the Malo Bridge in Bojonegoro Regency encountered significant challenges during the superstructure erection phase, primarily due to limited site accessibility and the use of a less suitable erection method. This study aims to evaluate the comparative efficiency of two primary erection techniques: the use of a 250-ton crawler crane operated from land and a combined method involving a 100-ton crawler crane supported by modular pontoons operating from the water. A case study approach with a quantitative methodology was applied, focusing on three main parameters: erection duration, construction cost, and risk management. The analysis indicates that the land-based 250-ton crawler crane method required a shorter erection period of 181 days, compared to 203 days for the modular pontoon method, resulting in a time-efficiency gain of 10.84%. Furthermore, the 250-ton crawler crane method demonstrated greater cost-effectiveness and a lower level of operational risk. These findings highlight that selecting an erection method that aligns with the site’s geographical and logistical conditions is crucial for optimizing construction performance. Appropriate method selection can lead to significant improvements in both time and cost efficiency, especially in complex or constrained environments.
Analysis of Drainage Channel Construction Work Time Using the Trade Cost Trade Off (TCTO) Acceleration Method in Ponorogo Regency Bela Prayogo; Laksono Djoko Nugroho; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 2 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i2.799

Abstract

Drainage infrastructure development plays a crucial role in supporting urban environmental quality and preventing waterlogging and flooding. However, construction projects often experience delays that hinder infrastructure performance. In the drainage channel construction project on Letjend Suprapto Street and Menur Street, Ponorogo Regency, a progress deviation of ?30.26% occurred in the eighth week, indicating the need for an effective acceleration strategy. This study aims to analyze the effect of applying the Trade-Off Cost–Time (TCTO) method on project time acceleration and cost changes. This research employed a quantitative approach using network planning analysis with Microsoft Project to identify the critical path, followed by crashing analysis through additional work shifts and cost slope calculations using the TCTO method. The findings indicate that the project duration can be reduced from 65 days to 60 days by implementing a two-shift work system. This acceleration resulted in an increase in direct costs from IDR 2,390,347,251.56 to IDR 2,411,296,170.48. The TCTO method is proven effective in accelerating project duration with manageable additional costs, making it a viable solution for overcoming delays in drainage construction projects.
Construction Cost Analysis of Spun Pile and Bored Pile Foundations for Aqueduct C of the Raw Water Supply Supplemental Project in Aceh Province Ghufran Helmi Aziz; Andi Patriadi; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 1 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i1.814

Abstract

Selecting the optimal deep foundation system is a critical task in major infrastructure projects, requiring a balance between structural performance, geotechnical constraints, and economic viability, as foundation costs typically represent a significant portion of the total budget. Bored piles and spun piles are two widely adopted deep foundation types, each offering distinct advantages in terms of capacity, installation speed, and environmental impact. Given the necessity for cost optimization in the Raw Water Supply Supplemental Project in Aceh Province, this study focuses on comparing the construction costs of these two foundation types for Aqueduct C. The foundation plan for Aqueduct C requires a total pile length of 2,870 meters with a diameter of 60 cm. The analysis uses unit cost data based on the Ministerial Regulation's Unit Price Analysis (AHSP) tables. The calculation results show that the total cost for the bored pile foundation is Rp2,847,074,353.90, while the total cost for the spun pile foundation is Rp3,205,844,730.90. This indicates that the bored pile foundation is more cost-effective for this specific project by approximately Rp358,770,377.00. The structural capacity analysis confirmed that the designed foundation group safely supports the axial load transferred by the piers.
Enhanced Artificial Neural Network Model with Feature Importance Analysis for Drainage Infrastructure Cost Prediction in Data-Scarce Regions Rahmat Rahmat; Andi Patriadi; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 2 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i2.815

Abstract

Accurate cost estimation of drainage infrastructure is a critical challenge in rapidly urbanizing regions, particularly in areas with limited historical project data. In Indonesia, inadequate estimation methods often lead to cost overruns and inefficient budget allocation, highlighting the need for more reliable predictive approaches. This study aims to develop and validate an Artificial Neural Network (ANN) for predicting drainage construction costs in data-scarce environments. A quantitative research design was employed using data from 10 drainage projects in South Buton Regency, which were expanded to 150 samples through rule-based data augmentation. The ANN model, based on a Multilayer Perceptron (MLP) architecture, was trained and validated using 5-fold cross-validation. Its performance was evaluated using R², MAE, RMSE, and MAPE, and compared with Multiple Linear Regression (MLR), Random Forest (RF), and Support Vector Regression (SVR) models. The results demonstrate that the proposed ANN model achieves superior predictive performance, with an R² of 0.9978 and MAPE of 3.04%, significantly outperforming the benchmark models. Feature importance analysis reveals that material-related costs, particularly stone masonry, are the most influential factors in determining total project cost. The model also shows strong generalizability and robustness across datasets. The findings imply that the integration of ANN, data augmentation, and feature importance analysis provides a practical and scalable solution for cost estimation in resource-constrained regions. This research contributes to improving decision-making in infrastructure planning, enhancing budget accuracy, and supporting more efficient and sustainable public investment strategies.
Analysis of the Water Balance of the Prumpung River Area (DAS) in Tuban Regency Using the Thornthwaite-Mather Method Rony Zakariya; Andi Patriadi; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 2 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i2.817

Abstract

Water is a vital resource whose availability is increasingly uneven due to climate variability, land-use changes, and rising water demand. This condition leads to water surplus during the rainy season and deficit during the dry season, including in the Prumpung Watershed, Tuban Regency. This study aims to analyze the monthly and annual water balance and evaluate the relationship between water availability and water demand in the study area. A descriptive quantitative approach was employed using the Thornthwaite–Mather method, based on rainfall and air temperature data from 2015 to 2024, combined with domestic and non-domestic water demand data for 2024. The results indicate that potential evapotranspiration fluctuates in accordance with air temperature, while actual evapotranspiration is influenced by groundwater availability. Groundwater storage increases during the rainy season and decreases during the dry season. The annual water balance reveals a dominance of deficit conditions in most observation years, although surplus occurs during certain periods. The Prumpung Watershed is vulnerable to water deficits due to uneven rainfall distribution. Sustainable water resource management strategies, focusing on conservation, are required to maintain a long-term hydrological balance.
Analysis of Time Acceleration in The Malaka Regent's Office Construction Project Using The Critical Path Method (CPM) and Time-Cost Trade-Off (TCTO) Thomas Aquino Seki; Laksono Djoko Nugroho; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.922

Abstract

The construction of the Malaka Regency Regent's Office has encountered significant challenges, including recurring project delays caused by factors such as design changes, unpredictable weather conditions, labor shortages, and insufficient materials or equipment. These issues have resulted in inefficiencies in project scheduling and cost management, highlighting the need for effective project management strategies. This study aims to analyze the project schedule, identify the critical path, and evaluate schedule acceleration alternatives for the Malaka Regent's Office construction project using the Critical Path Method (CPM) and the Time–Cost Trade-Off (TCTO) method. The study applied the Critical Path Method (CPM) and the Time–Cost Trade-Off (TCTO) method to analyze the project schedule, identify critical activities, and evaluate feasible acceleration strategies. The analysis showed that the originally planned project duration of 224 calendar days could be reduced to 196 calendar days using the CPM approach, while the TCTO method further shortened the project duration to 182 calendar days. This acceleration was achieved by minimizing idle time between critical activities, optimizing resource allocation, and implementing time–cost trade-off strategies without compromising the project's quality or scope. The findings demonstrate the effectiveness of CPM and TCTO in optimizing construction schedules and reducing project delays. Furthermore, this study provides a practical framework for improving schedule and cost performance in construction projects, particularly those involving public infrastructure development.
Analysis of The Rationalization of Rainfall Stations in The Kayan River Basin, North Kalimantan Province Fadzil Abdillah; Hanie Teki Tjendani; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.923

Abstract

The Kayan River Basin (Wilayah Sungai [WS]) covers an area of 3,178,215.72 hectares, making it one of the largest river basins in Kalimantan. However, compared with other river basins in the region, the Kayan WS currently has only seven rainfall stations, of which six are operational and one is damaged or inactive. This limited observation network is insufficient to represent the highly heterogeneous spatial distribution of rainfall across the basin, which extends from mountainous upstream areas with high precipitation to lowland coastal regions. Therefore, this study aims to determine the most appropriate rationalization method for identifying the optimal number and spatial distribution of rainfall stations capable of adequately representing rainfall variability within the Kayan River Basin. Three approaches were evaluated for rainfall station rationalization: the maximum requirement method, the minimum requirement method, and the Kagan–Rodda method. The results indicate that the Kagan–Rodda method is the most suitable approach for rationalizing the rainfall station network in the Kayan WS. Based on this method, the basin requires a total of 33 rainfall stations. Given that only six operational stations currently exist, an additional 27 rainfall stations are required to establish an optimal monitoring network.
Co-Authors Ade Sholeh Hartawan Ahmad Rois Aki’ Suprapto Alang Candra M Andi Patriadi Andi Patriadi Andiyan Andiyan Arik Nur Cahyo Atma Djendra Purbo Bela Prayogo Budi Witjaksana Budi Witjaksana Budi Witjaksana Christio Aji Sasongko David Himawan Susetya domingos godinho Dwi Atwin Suyitno Dwi Erry Nopriyanto Ean Fadhillah Nurrahmat Fadzil Abdillah Ghufran Helmi Aziz Hanggana Prayuda Bakti Hanie Teki Tjendani Hanie Teki Tjendani Hanie Teki Tjendani Hanie Teki Tjendani Hasan Alif Fathurokman Jaka Purnama Jamiludin Jamiludin Jarwoto Jarwoto Jenodius Aldino John Jiden Desta Mahendro Kris Minaryo Laksono Djoko Nugroho Leo Agus Sulistianto Linda Nailufar Lukman Ardianto M. Fajar Venusia A Maya Yusnita Muchamad Lutfi Muhammad Efendi Muhammad Zainal Muttaqin Muhammad Zainal Muttaqin Ony Frengky Rumihin Orlando Gomes Rahmad Junaidi, Rahmad Rahmat Rahmat Rony Zakariya Rony Zakariya Shreeniwas Omanwar Slamet Riyadi Thomas Aquino Seki Tisno Subroto Ummatus Sholikhah Wahyu Kusuma Wardhana Yunaidi Supriyanto