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All Journal TEKNIK JURNAL SUMBER DAYA AIR
Firmana, Ary
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Civil Engineering, Building, Construction & Architecture Engineering

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Impact Analysis of Land Use on Time Lag and Peak Discharge in the Downstream Area of Sadia Watershed Bima City West Nusa Tenggara using HEC-HMS and SCS-CN Hartawan, I Putu; Siddik, Firmana; Firmana, Ary; Susetyo, Ekanto Wahyudi; Harlan, Dhemi; Handyastono, Bagus; AS Algoul, Mohammed
TEKNIK Vol 46, No 3 (2025): Vol 46, No 3 (2025): July 2025 Publication in-progress
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i3.75074

Abstract

Flood events have frequently occurred in the downstream area of the Sadia Watershed (DAS) in Bima City, West Nusa Tenggara. In recent years, the overflow of the Sadia River has been triggered by land use changes and the impacts of climate change. This study aims to analyze land cover changes in 2015, 2019, and 2022, and to evaluate their impact on flood peak discharge using hydrological simulations, land cover data were analyzed using ArcGis software and integrated with hydrological modeling using HEC-HMS. The Synthetic Unit Hydrograph (HSS) SCS-CN method was used in the simulation with a 25-year return period, following calibration of the Sadia River’s bank full discharge to ensure model accuracy. The simulation results showed an increase in the peak discharge entering the Sadia River, from 156,20 m³/s in 2015 to 164,80 m³/s in 2019, and 167,00 m³/s in 2022. Additionally, the time lag decreased from 445.15 minutes in 2015 to 431.84 minutes in 2019 and 429.88 minutes in 2022. The increase in the Curve Number (CN) value and impermeable area indicates a reduction in soil infiltration capacity due to land conversion. However, climate factors, such as increased rainfall intensity, also contributed to the rise in peak discharge. These findings can serve as a basis for better land use management and emphasize the importance of considering climate factors when designing flood risk mitigation efforts, especially in the face of increasing flood events.
TINJAUAN POTENSI TEKNIS DAN KELAYAKAN EKONOMI PLTA PADA PROYEK KERJA SAMA PEMERINTAH DENGAN BADAN USAHA BENDUNGAN MERANGIN Larasari, Agustia; Sitorus, Jessica; Wiratama Asad, Moh. Bagus; Firmana, Ary
JURNAL SUMBER DAYA AIR Vol 17, No 2 (2021)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v17i2.724

Abstract

One of the utilizations of a multipurpose dam that has socio-economic value during its operation iselectricity generation. The addition of a hydropower component to a PPP project is quite a challenge due to substantial uncertainty related to hydrological aspects that will impact electricity production and revenue, as well as high initial investment costs for generating units. This study aims to map the technical potential of hydropower and evaluate the economic feasibility of hydropower in the Merangin Dam PPP Project. The potential for power and energy generation is obtained through simulations of the hydropower operation for 19 years using hydrological data, HEC-HMS model generated-data, and dam engineering design. According to the results, the technical potential of hydropower can produce, on average, power of Pp = 103.8 MW during peak load, Pb = 98.53 MW during base load, and total energy of 636.66 GWh/year. The economic potential is evaluated through social cost-benefits analysis (SCBA) by estimating the additional benefits obtained from the hydropower compared to the PPP structure of the Merangin Dam without hydropower. Through SCBA, the addition of hydropower to the Merangin Dam PPP structure has an EIRR value of 35.24%, NPV of Rp. 2.104.212.122.723,- and BCR = 3.06. Based on these indicators, the provision of hydropower plants is considered economically feasible because the benefits that will be generated and obtained by the community are higher than the economic costs incurred.Keywords: Technical potential, economic feasibility, hydropower plant, multipurpose dam, PPP
Co-Authors AS Algoul, Mohammed Dhemi Harlan, Dhemi Handyastono, Bagus Hartawan, I Putu Larasari, Agustia Siddik, Firmana Sitorus, Jessica Susetyo, Ekanto Wahyudi Wiratama Asad, Moh. Bagus