Abstract
In low head bubbler irrigation, water is applied to the soil surface as a little stream, typically from a small-diameter tube without filtration. The main aim of this study was helped to introduce a proper design of a low head bubbler lateral which achieves full application uniformity. In this study, a computer program was developed to identify bubbler heights hh at each outlet point, maximum of outlet numbers On, lateral length Lmax and flow QT, using the data obtained from water temperatures Tw, bubblers and lateral diameters, allowable lateral upstream pressure head Hal and the soil surface slope. The optimum design example was presented to four bubbler tube diameters of 3.8, 6.0, 10.0 and 13.6mm with allowable lateral upstream pressure head Hal, of 1.0 and 1.5m for different bubbler discharges qb. Laboratory experiments to validate this example were performed. The results showed that a high correlation between the developed design program, and the results obtained from laboratory experiments. The study revealed that the program was an efficient and accurate way to design full irrigation uniformity by very low operating pressure.
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