The Effect of Two-Way Connection on the Lateral Hydraulic Performance of Drip Tape Irrigation

Document Type : Research Paper

Authors

1 Ph.D. Candidate, Department of Irrigation and Reclamation Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran

2 Department of Water Engineering, Faculty of Agriculture, Lorestan University, Iran

3 Department of Irrigation and Reclamation Engineering, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

4 Department of Water Engineering, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran.

10.22059/jwim.2023.360015.1081

Abstract

Due to the lack of water resources, it is necessary to increase water productivity in the agricultural sector by using methods such as improving the design of drip irrigation systems. This research was conducted with the aim of investigating the effect of lateral two-way connection to the semi-main pipe on the lateral hydraulic performance in drip tape irrigation. For this purpose, an experiment was conducted with three factors. The first factor was the connection mode of the tapes including one and two-way, the second factor was the line head pressure including 0.25, 0.50, 0.75, 1.00, 1.50 and 2.00 bar and the third factor was the tape length including 48, 96 and 144 m. According to the results, the average relative pressure changes along the 48, 96, and 144 m irrigation tapes under one-way connection was estimated 28.8, 72.9, and 90.8 percent, respectively, and under two-way connection was estimated 5.2, 24.8, and 45.6 percent. Regardless of the connection mode, the average relative pressure changes along the 48, 96, and 144 m tapes were 17.0, 48.8, and 68.2 percent, respectively. The power of discharge-pressure relationship under one-way and two-way connection were 0.803 and 0.647, respectively. The power of discharge-pressure relationship for 48, 96 and 144 m tapes under one-way connection was estimated as 0.618, 0.703 and 0.921 and under two-way connection as 0.635, 0.625 and 0.678 respectively. Increasing the tape length had a negative effect on the hydraulic performance of the system by increasing the relative changes of pressure and the power of the discharge-pressure relationship. The R2 statistic for the extracted discharge-pressure relationships was in the range of 0.95 to 0.99.

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