الفهرس 
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Abstract
Worldwide, agriculture currently uses about 70% of the total water withdraw for irrigation, greatening to 87% in the developing countries. The objective of this study is developing a program to simple design an economic low head coiled-tube irrigation with a good water application uniformity. The work in this program was carried out through three stages.
First, constructing the model design of the lateral coiled-tube irrigation by solving some hydraulic equations. The design includes optimum lateral length, inlet pressure head and coiled-tube discharges to achieve high water application uniformity under different parameters.
Second, validating this design by coiled-tube hydraulic calibration and evaluate the designed lateral by the model. In the hydraulic calibration experiment, three coiled-tube diameters (CID) of 3.8, 5.2 and 6.8mm with different coiled-tube lengths of 0.5, 0.75 and 1.0m were calibrated, by measuring the discharge under operating pressure heads of 0.3, 0.6, 0.9, 1.2 and 1.5m. Then, the coiled-tube discharge exponents x for all diameters was ranged from (0.40 to 0.63) which classified as turbulent flow. The manufacturer’s coefficient of variation (Cv) was calculated and ranged from 0.037 to 0.049 which considered an excellent classification. The lateral design by the model was evaluating of two selected coiled-tube diameters from the first experiment (3.8 and 5.2mm), at interval distances of 3.0 and 6.0m on lateral, under three different operating pressure of 0.5, 1.0 and 1.5m. The comparison between the theoretical with each of laboratory design and practical measurements. Cu at different lengths and diameters of coiled-tube under operating pressures indicated that, a very good agreement between theoretical design and laboratory design. While it was good agreement between theoretical design and practical measurements.
Third, utilized the model design to accomplish software program by MATLAB (R2015a) program. The program enables to analyze the coiled-tube and lateral input data under desirable operating conditions. Then, design lateral line with optimum length, inlet pressure and flow rate variation for predetermined Cu with or without laboratory data of discharge equation constants (k, x). The developed design software is expecting to be a supporter for irrigation system designers to design in a short time with trustworthy accuracy.