Discharge Coefficient of Irrigation Structure in Regulators of Left Lateral Canal of Pranburi Operation and Maintenance Branch 4, Kui Buri District, Prachuap Khiri Khan Province
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Abstract
This study aims to calibrate the discharge coefficient of irrigation structures of the Pranburi Operation and Maintenance, Branch 4, Regional Irrigation Office 14, Kui Buri District, Prachuap Khiri Khan Province. The discharge coefficient (Cs) can be used to calculate the amount of water flowing through the irrigation structures, which control the flowing volume more accurately. The 11 head regulators of the left lateral canal were calibrated, which were 50L, 51L, 52L, 54L, 58L, 59L, 60L, 61L, 62L, 64L, and 66L. The result shows the accuracy of calculated velocity of the water flow through the cross-section of each canal. They are quite different due to 1) canal diverse sizes 2) different heads of sluice gates (Go) and 3) varying sluice gate dimension patterns. The measured discharge varied between 0.383–1.520 m3/s and the discharge coefficient (Cs) is inversely proportional to the elevation difference (ΔH). The discharge coefficient (Cs) is between 0.118–0.718 while average Manning’s roughness coefficient (n) is 0.0224. The results can be applied in conjunction with the timely-based budgetary allocations in support of canal maintenance prioritization to ensure the most effective goal available.
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