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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.
ANALISIS SISTEM PEMBERIAN AIR TERHADAP TANAH SAWAH BERBAHAN ORGANIK Sarra Rahmadani .; Fatchan Nurrochmad .; Joko Sujono .
Educational Building: Jurnal Pendidikan Teknik Bangunan dan Sipil Vol. 6 No. 2 (2020): Educational Building: Jurnal Pendidikan Teknik Bangunan dan Sipil
Publisher : Jurusan Pendidikan Teknik Bangunan Fakultas Teknik Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ebjptbs.v6i2 DES.22015

Abstract

Salah satu tantangan utama yang dihadapi dalam pengembangan komoditas pertanian khususnya tanaman padi adalah cara memperoleh hasil yang lebih dengan penggunaan air minimum. Hal tersebut dapat dicapai melalui pengelolaan yang baik terhadap metode pemberian air, serta usaha pengkondisian tanahnya.Metode pemberian air dalam budidaya padi varietas Ciherang yang dilakukan adalah Alternate Wetting and Drying (AWD), konvensional dan Mid Summer Drainage (MSD).Penelitian dilakukan di Rumah Kaca, Fakultas Pertanian UGM pada lahan percobaan (pot).Jumlah air irigasi yang diberikan tergantung pada metode irigasi yang diterapkan.Untuk metode AWD dan MSD genangan air irigasi dipertahankan adalah 2 cm pada waktu yang telah ditetapkan berdasarkan sistemnya, sedangkan konvensional dengan kedalaman 3 cm sepanjang masa tanam.Perhitungan perkolasi dilakukan setiap hari sebelum pemberian air irigasi dengan menimbang berat air perkolasi.Penelitian ini menganalisis pengaruh sistem pemberian air pada tanah sawah berbahan organik (komposisi 40% dan 60%) terhadap hasil produksi gabah kering, keragaan tanaman, kebutuhan air irigasi, perkolasi serta produktivitas air tanaman padi. Hasil uji statistik Duncan Multiple Range Test (DMRT) menunjukkan bahwa metode AWD merupakan metode yang paling unggul dan beda nyataapabila dibandingkan dengan metode konvensional dan MSD. Metode AWD dengan masa tanam 110 HST menghasilkan 43 anakan, tinggi tanaman 127 cm, gabah kering panen 105 gr, kebutuhan air 78.92 liter, rerata perkolasi tengah bulanan 2.85 mm/hari dan produktivitas airnya 1.3 kg/m³. Penambahan bahan organik berpengaruh terhadap kemampuan tanah mengikat air yang artinya perkolasi dapat berkurang dengan penambahan bahan organik.Komposisi bahan organik 40% sudah dapat mencapai nilai yang optimum dalam kemampuan tanah mengikat air. Kata Kunci : Alternate Wetting and Drying, Mid Summer Drainage, Padi, Produktivitas Air ABSTRACT One of the main challenges faced in the development of agriculture commodity especially rice crop is how to get more results with minimum water. It can be achieved through a good management of water delivery method, as well as soil condition. In this study, several methods of water irrigation in rice cultivation  Ciherang variety were applied i.e. alternate wetting and drying (AWD), conventional and mid summer drainage (MSD). The study was conducted in the greenhouse, Faculty of Agriculture in the field trials (pot). The amount of water irrigation given depend on the irrigation method which was applied. For the AWD and MSD methods, the inundation of water irrigation is 2 cm, whereas for conventional methods with a depth of 3 cm throughout the planting period. Percolation was measured everyday before offering water irrigation by weighing the percolation water weight. This study analyzed the influence of water irrigation methods on paddy soil made from organic (composition of 40% and 60%) on dry grain yields, the performance of plants, water irrigation need, percolation and water productivity of rice plants.The result of statistical test using Duncan multiple range test (DMRT) method indicated that AWD method was the most superior method and significantly different when compared with conventional and MSD method. By the AWD method with a planting period of 110 HST produced 43 tillers, 127 cm plant height, 105 grams of dried grain yield, water need on the average of 78.92 liters, the average percolation 2.85 mm/day and water productivity of 1.3 kg/m³. The addition of organic matter affected on the soil is ability to hold water, which means that percolation can be reduced by adding organic matter. The composition of 40% organic matter can already achieve the optimum value in the soil's ability to hold water.  66Keywords: Alternate Wetting and Drying, Mid Summer Drainage, Rice, WaterProductivity
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