الفهرس 
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Abstract
ABSTRACT
The aim of this research was to investigate the performance of three
bubbler tube diameters of 3.8, 5.2 and 13.6 mm at three initial operating pressure of 15, 30, 45 kPa to determine optimum operating conditions that achieve high discharge uniformity. The experimental work was conducted at the farm of agricultural faculty, Suez Canal University, Ismailia. The coefficient of uniformity (Cu) was evaluated in two cases.
First, when bubbler outlets heights were at the same level at 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 m. The results show that the highest values of the
coefficient of uniformity were obtained from operating pressure of 30 kPa and bubbler diameter of 5.2 mm where values were almost constant
with average 99.3%.
Second, when bubbler outlets were parallel to the hydraulic gradient line with three effective pressures for each initial operating pressure.
The results show that all bubbler tubes were along the lateral line give the same discharge for 3.8 and 5.2 mm, but the discharge different for
13.6 mm bubbler tube diameter.
The recommended bubbler diameter was 5.2 mm with 30 kPa initial operating pressure for achieve high discharge uniformity; In addition,
it achieves higher lateral line length than 3.8 mm bubbler diameter
to minimize initial irrigation system cost. Also, bubbler diameters 13.6 mm are not recommended for lowhead bubbler systems due to poor
water distribution uniformity.
Key words: Bubbler irrigation, Low Head Irrigation, Coefficient of
Uniformity (Cu), Bubbler Irrigation Performance