Physical Model Design of Tertiary Box Combined with Overflow and Orifice
Abstract
This research aimed to design tertiary boxes combined with overflow and orifices. The methodology consists of a physical model test of the orifice. The model dimensions used in this research are adapted to the field conditions required in the criteria of irrigation design and as trial variables: channel width = 0.42 m; channel height (h) = 0.78 m; and crest height (P) = 0.25 m. The crest width uses two alternatives: 0.42 and 0.33 m. However, the diameter of the orifice uses three alternatives: 0.08 m, 0.06 m, and 0.04 m. The orifice placement also uses three alternatives: in the channel bed, the distance of the orifice from the channel bed is ½ of the diameter, and the distance of the orifice from the channel bed is the same as the diameter. Several orifices also use three variations: one, two, and three orifices. However, discharge uses eight variations: 25 l/s, 30 l/s, 35 l/s, 40 l/s, 45 l/s, 50 l/s, 55 l/s, and 60 l/s. Based on the variation of variables above, we obtained 448 scenarios, consisting of 432 scenarios using orifices and 16 scenarios without orifices. The research result will produce the average discharge coefficient of the orifice, the difference ratio limits of the downstream and upstream water levels so that it does not cause submerged flow, and produce ideal dimensions and positions of the orifice to the accuracy of proportional discharge division under the condition of free and submerged flows.
Keywords: physical model, overflow, orifice, tertiary box.
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