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All Journal Jurnal Teknik Pengairan: Journal of Water Resources Engineering Jurnal Ilmiah Teknik Sipil Open Access DRIVERset
I Putu Gustave Suryantara Pariartha
Udayana University
Civil Engineering, Building, Construction & Architecture Engineering

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Analisis Debit Rencana Tukad Unda Bagian Hilir Menggunakan HEC-HMS I Putu Gustave Suryantara Pariartha; I Kadek Dika Arimbawa; Mawiti Infanteri Yekti
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 12 No. 2 (2021)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2021.012.02.04

Abstract

Pembangunan waduk muara yang berlokasi di Tukad Unda merupakan pembangunan dalam tahap perencananaan. Waduk muara dibangun sebagai infrastruktur mitigasi bencana prasarana pengendali banjir. Perkiraan pembangunan waduk muara dari tahun 2020 sampai dengan tahun 2022. Penelitian ini bertujuan untuk mencari debit banjir rencana pada DAS Tukad Unda sebagai pertimbangan dalam pembangunan tersebut. Dalam penelitian ini digunakan dua metode untuk mencari debit banjir rencana, diantaranya metode perhitungan HSS Nakayasu dan metode model HEC-HMS. Debit banjir rencana yang dihitung menggunakan perhitungan HSS Nakayasu pada kala ulang 5 tahun, 10 tahun, 20 tahun, 25 tahun, 50 tahun, dan 100 tahun mempunyai debit puncak (Qp) sebesar 478.70 m3/dt, 649.33 m3/dt, 763.08 m3/dt, 910.01 m3/dt, 1019.02 m3/dt, dan 1128.03 m3/dt. Sedangkan debit banjir yang dihitung dengan metode HEC-HMS pada kala ulang 5 tahun, 10 tahun, 20 tahun, 25 tahun, 50 tahun, dan 100 tahun mempunyai debit puncak (Qp) sebesar 514,3 m3/dt, 697,6 m3/dt, 819,8 m3/dt,  977,7 m3/dt, 1094,8 m3/dt, dan 1211,9 m3/dt. Parameter yang ditemukan melalui program HEC-HMS adalah initial abstraction sebesai 99,987 mm, curve number sebesar 35,018, dan impervious sebesar 16 %. The construction of estuary reservoir located in Unda River is a development in the planning stage. Estuary reservoirs are built as disaster mitigation infrastructure for flood control. The construction of estuary reservoir is planned from 2020 to 2022. This research aims to find the flood design discharge of Tukad Unda watershed plan as consideration in the construction development. In this study, two methods were used to calculate the flood design discharge such as the HSS Nakayasu calculation method and the HEC-HMS model method. Flood design discharge calculated using HSS Nakayasu calculation at 5 years, 10 years, 20 years, 25 years, 50 years, and 100 years have peak discharge (Qp) respectively are 478.70 m3/s, 649.33 m3/s, 763.08 m3/s, 910.01 m3/s, 1019.02 m3/s, and 1128.03 m3/s. While flood discharge calculated by HEC-HMS method at 5 years, 10 years, 20 years, 25 years, 50 years, and 100 years have peak discharge (Qp) respectively are 514.3 m3/s, 697.6 m3/s, 819.8 m3/s, 977.7 m3/s, 1094.8 m3/s, and 1211.9 m3/s. The parameters found through the HEC-HMS program are an initial abstraction of 99,987 mm, a curve number of 35,018, and an impervious of 16%.
ANALYSIS OF IRRIGATION WATER QUALITY INDEX AND EVALUATION OF LAND SUITABILITY IN DRYLAND IRRIGATION SYSTEMS AS EFFORTS TO OPTIMIZE AGRICULTURAL PRODUCTIVITY Luthfi Inayah; I Putu Gustave Suryantara Pariartha; Silvia Gabrina Tonyes
Jurnal Ilmiah Teknik Sipil Vol. 29 No. 2 (2025): Jurnal Ilmiah Teknik Sipil, Vol. 29 No. 2, September 2025
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2025.v29.i02.p10

Abstract

The availability and quality of irrigation water is an important factor in ensuring the sustainability of agricultural productivity, especially in drylands that are prone to drought such as in Abang District, Karangasem Regency, Bali. This study aims to analyze surface water quality for irrigation and evaluate land suitability through a comparative approach between the National Sanitation Foundation-Water Quality Index (NSF-WQI) method and the Index of Surface Water Susceptibility to Pollution (IKAPP). Surface water samples from Tukad Nyuling were analyzed based on physical and chemical parameters, and land suitability evaluation was also conducted by considering soil characteristics, such as permeability. The results showed that NSF-WQI values ranged from 69.96 to 79.78 within moderate to high limits while IKAPP water quality index values ranged from 23.69 within low vulnerability limits, this could be due to salinity constraints and contaminant indicators. A comparative rational analysis was then conducted which indicated that NSF-WQI is more suitable for use in the study area because it is able to capture variations in water quality that correlate with local physical, hydrological, and agroecological conditions. Integration of NSF-WQI results with land evaluation resulted in specific land management recommendations as well as crop suitability classifications, such as corn, green beans, chili, and other horticulture. This study concludes that in addition to being a representative measure of irrigation water quality, the application of the analysis supports efforts to improve less suitable land, through measures such as crop suitability evaluation, salinity management, and soil permeability improvement, thereby increasing agricultural productivity and supporting sustainable dryland management in Abang Sub-district.
ANALYSIS OF IRRIGATION WATER QUALITY INDEX AND EVALUATION OF LAND SUITABILITY IN DRYLAND IRRIGATION SYSTEMS AS EFFORTS TO OPTIMIZE AGRICULTURAL PRODUCTIVITY Luthfi Inayah; I Putu Gustave Suryantara Pariartha; Silvia Gabrina Tonyes
Jurnal Ilmiah Teknik Sipil Vol. 29 No. 2 (2025): Jurnal Ilmiah Teknik Sipil, Vol. 29 No. 2, September 2025
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JITS.2025.v29.i02.p10

Abstract

The availability and quality of irrigation water is an important factor in ensuring the sustainability of agricultural productivity, especially in drylands that are prone to drought such as in Abang District, Karangasem Regency, Bali. This study aims to analyze surface water quality for irrigation and evaluate land suitability through a comparative approach between the National Sanitation Foundation-Water Quality Index (NSF-WQI) method and the Index of Surface Water Susceptibility to Pollution (IKAPP). Surface water samples from Tukad Nyuling were analyzed based on physical and chemical parameters, and land suitability evaluation was also conducted by considering soil characteristics, such as permeability. The results showed that NSF-WQI values ranged from 69.96 to 79.78 within moderate to high limits while IKAPP water quality index values ranged from 23.69 within low vulnerability limits, this could be due to salinity constraints and contaminant indicators. A comparative rational analysis was then conducted which indicated that NSF-WQI is more suitable for use in the study area because it is able to capture variations in water quality that correlate with local physical, hydrological, and agroecological conditions. Integration of NSF-WQI results with land evaluation resulted in specific land management recommendations as well as crop suitability classifications, such as corn, green beans, chili, and other horticulture. This study concludes that in addition to being a representative measure of irrigation water quality, the application of the analysis supports efforts to improve less suitable land, through measures such as crop suitability evaluation, salinity management, and soil permeability improvement, thereby increasing agricultural productivity and supporting sustainable dryland management in Abang Sub-district.
Co-Authors I Kadek Dika Arimbawa Luthfi Inayah Mawiti Infantri Yekti Silvia Gabrina Tonyes