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All Journal Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Nur Aqilah Rasyid
Universitas Muhammadiyah Parepare
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Substitusi Cangkang Kemiri Sebagai Pengganti Sebagian Agregat Kasar terhadap Kuat Tekan Beton dengan Perendaman Air Normal dan Air Laut Nur Aqilah Rasyid; Rahmawati Rahmawati; Muh. Jabir M; Imam Fadly; Adnan Adnan
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 3 (2026): Agustus : Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i3.1644

Abstract

Control-gate operation affects discharge and water-conveyance performance in secondary irrigation canals. This study evaluates the hydraulic performance of the Boki 2-Boki 3 Secondary Canal in Pinrang Regency under five gate-opening levels and identifies a relative optimum opening based on discharge capacity, conveyance efficiency, and water loss. A quantitative field-survey approach was applied at six observation stations (STA 0+000, 0+200, 0+700, 1+200, 1+460, and 1+468) using gate openings of 15, 30, 45, 65, and 85 cm. Surface-flow velocity was measured using the float method and calculated from V=L/t; the measured surface velocity was used directly without a correction factor to determine discharge from Q=A×V. Conveyance efficiency and water loss were evaluated from upstream and downstream discharge. The results show that larger gate openings increased flow area, velocity, and discharge, but were accompanied by greater water loss and lower total conveyance efficiency. The 15 cm opening produced the highest efficiency of 85.89% with a water loss of 0.0316 m³/s, whereas the 85 cm opening produced the largest upstream discharge of 1.4638 m³/s but reduced efficiency to 71.97% with a water loss of 0.4103 m³/s. The 45 cm opening was identified as the relative optimum among the tested conditions, providing an upstream discharge of 0.5618 m³/s, an efficiency of 82.79%, and a water loss of 0.0967 m³/s (17.21%).
Co-Authors Imam Fadly Muh. Jabir M Rahmawati Rahmawati