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All Journal Jurnal Aplikasi Teknik Sipil SENTRI: Jurnal Riset Ilmiah
Ansori, Fakhrudin Naufal
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Aerospace Engineering Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Law, Crime, Criminology & Criminal Justice

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Pemodelan Perubahan Morfologi Sungai Akibat Pembuangan Lumpur Sidoarjo Pada Kali Porong Rahman Alam, Rizki Robbi; Saud, Ismail; Ansori, Fakhrudin Naufal; Ralindra, Deris Faisa; Prajitno, A. Faiz Hadi
Jurnal Aplikasi Teknik Sipil Vol 22, No 2 (2024)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2579-891X.v22i2.19613

Abstract

The continuous discharge of mud into Porong River can affect the river's capacity. Therefore, this research aims to understand Porong's River capacity after becoming a disposal site for Sidoarjo mud and to analyze its effects over the next 10 years. The methods used include the application of the Thomas Fiering method to generate rainfall data during that period. This rainfall data is then processed using FJ Mock calculations to obtain Kali Porong's discharge data. Subsequently, this river discharge data is input into the MIKE 21 application to simulate the water surface elevation in Kali Porong. The results of this study include modeling of water surface elevations that reveal the distribution of sediment deposited at various locations based on U*. An important implication of this research is that the modeling results can be used by relevant parties in managing Kali Porong's capacity as a disposal site for Sidoarjo mud until 2032. A critical finding from this study is the presence of sections with overtopping conditions on both the right and left sides of line 5, suggesting the need to raise the embankment by 2 meters on the right side and 0.5 meters on the left side to maintain the capacity and sustainability of the river. 
Risk Identification of Private Entities in Public-Private Partnership (PPP) Projects for Water Supply Systems (SPAM) Ansori, Fakhrudin Naufal; Rachmawati, Farida
SENTRI: Jurnal Riset Ilmiah Vol. 5 No. 1 (2026): SENTRI : Jurnal Riset Ilmiah, Januari 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v5i1.5734

Abstract

The development of Water Supply System (SPAM) infrastructure through the Public-Private Partnership (PPP) scheme serves as a strategic solution to the state's fiscal limitations. However, its implementation faces challenges of high-risk complexity, particularly regarding the resilience of private partners post-construction. Failure to anticipate risks from the bidding stage often leads to financial distress or service failure during the concession period. This study aims to identify and map the dominant risk profile inherent to private entities during the partner selection phase of SPAM PPP projects. Using a descriptive quantitative method, data were collected through structured questionnaires from 7 expert respondents representing key stakeholders, selected via purposive and snowball sampling techniques. Data analysis was performed by calculating the Severity Index to map risks into a probability and impact matrix. The results reveal a significant risk distribution pattern, where the majority of risks are concentrated in the red zone (high/extreme risk) and orange zone, with none in the safe zone. Specifically, the study identified three highest-risk variables: "debt burden and financial instability" (financial aspect), "lack of capability in design and construction" (technical aspect), and "weakness in water system management capability" (managerial aspect). "Debt burden and financial instability" was identified as the most critical risk in the extreme quadrant, with the highest impact of 83%. Meanwhile, socio-political risks demonstrated significant impact despite having a lower probability. This study concludes that financial stability and technical competence are "killer factors" that must be prioritized in the evaluation criteria for private entity selection. The findings recommend that the Government Contracting Agency (PJPK) tighten the selection process regarding financial and technical aspects to ensure project sustainability.
Co-Authors Farida Rachmawati, Farida Prajitno, A. Faiz Hadi Rahman Alam, Rizki Robbi Ralindra, Deris Faisa Saud, Ismail