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All Journal Civil Engineering Forum Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Teknik Pengairan: Journal of Water Resources Engineering agriTECH Jurnal Teknik Sipil Journal of Geoscience, Engineering, Environment, and Technology Journal of the Civil Engineering Forum Jurnal Irigasi Educational Building: Jurnal Pendidikan Teknik Bangunan dan Sipil Prosiding Seminar Nasional Teknik Sipil UMS Teknologi Sipil : Jurnal Ilmu Pengetahuan dan Teknologi Jurnal Manusia dan Lingkungan
Fatchan Nurrochmad
Departemen Teknik Sipil Dan Lingkungan, Fakultas Teknik, Universitas Gadjah Mada, Yogyakarta.
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Physics Social Sciences Transportation Other

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Calibration of Water Distribution Unit in Subak Irrigation System Gusti Ngurah Hesa Respati, I; Nurrochmad, Fatchan; Prima Ari Pratiwi, Endita
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol. 17 No. 1 (2026)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2026.017.01.7

Abstract

The Subak system has an irrigation water distribution unit known as tektek and an intake structure called Tembuku Penyahcah. The adjustment of the number of tektek in Subak Pulagan to ensure equitable water utilization within the subak is still based on estimations by the Pekaseh (Subak leader). Therefore, it is necessary to analyze the actual water distribution in the observed plots. This study aims to formulate an equation using the broad-crested weir approach for the Tembuku Penyahcah intake structure and to validate the resulting calculations. The study was conducted during the second rice planting season of 2021, from August to December, on an observation plot covering 7.70 hectares. The research stages included obtaining measured discharge data from water-level observations and flow rate measurements and performing regression analysis using the power equation. Calibration analysis was performed by comparing the discharge equation of the broad-crested weir with the measured discharge using the power equation. The exponent of the water depth (h) was adjusted to match the exponent in the broad-crested weir equation. Validation of various discharge equations against the measured discharge was conducted using correlation coefficient, RMSE, relative RMSE, MAE, and relative MAE methods. The results indicate that the calibrated discharge coefficients for the Tembuku Penyahcah intake structures A, B, C, and D are 0.500, 0.410, 0.710, and 5.233, respectively. The validation results show that the calibrated discharge curve equation effectively reduces error compared to the theoretical broad-crested weir discharge curve.
Co-Authors Adam Pamudji Rahardjo Arviananda, Rr. Dita Bambang Agus Kironoto Budi Kamulyan Budi Wignyosukarto Cut Dwi Refika Darajat, Achmad Rafi’ud Desneri Didirianti Dhinar Yoga Hanggung Legowo Djoko Legono Djoko Legono Eka Laily Ramadhani Ekha Yogafanny, Ekha Endita Prima Ari Pratiwi Endita Prima Ari Pratiwi Endita Prima Ari Pratiwi Gusti Ngurah Hesa Respati, I Intan Supraba, Intan Istiarto Istiarto Joko Sujono Joko Sujono Joko Sujono . Karlina, K Made Widiadnyana Wardiha Maulida, Fitria Afriani Monica Rina Tutkey Murtaqi, Muhamad Anif Ainul Prima Ari Pratiwi, Endita Rachmad Jayadi Radianta Triadmadja Rahardjo, Adam Pamudji Refika, Cut Dwi Sarra Rahmadani Sri Harto Brotowiryatmo Sunjoto Sunjoto Syahrani Syahrani SYAHRANI SYAHRANI Tandi, Frederik K Umar Fauzan Wahyudin, Wahid Syaifullah Wignyosukarto, Budi Santoso