Design of small holdings irregular shape micro irrigation unit [electronic resource].

Includes references.

An interactive computer design model for irregular shape micro-irrigation unit was developed. This program analyzes the system design by predicting pressure and flow distributions and some other factors such as uniformity, flow variation and system piping sizes. The model provides designs rapidly for user inspection by comparing design options that would require extensive time and effort. The hydraulic design model involved in this design model is based on distal outlet back step method and golden search technique. Pressure and flow distributions were measured in field and compared quite well with those predicted from the design model. The results of field evaluation of the experimental unit designed by the model directly after installation indicated that both hydraulic and statistical uniformities are above 90% which means that the irrigation system was well designed and installed. The reevaluation after 6 months indicated that the statistical uniformity reduced due to the change of emitter performance by 4.74% to 12.12%. This suggested that chemical injection was required to restore the system uniformity to its original value. The hydraulic uniformity was also reduced. Therefore, system repair and maintenance is necessary.

Summary in Arabic.

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