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This article presents an accurate and simplified method for designing a furrow irrigation system that would be useful in arid regions with clay soils. Field experiments were conducted at a site in Egypt where cotton is grown in clay soils. The site is usually irrigated every 10 days and follows a three-turn crop rotation. Several parameters were measured including furrow geometry, slope, width, length, infiltration characteristics, advance time, cut-off time, depletion time, and recession time. A volume balance model was applied to simulate water flow in the furrow system, and the results were compared to those obtained from the field measurements. This study shows that a volume balance model can be satisfactorily applied to clay soils, and the length of the furrow and its inlet inflow are the main factors affecting application efficiency. Further, this study indicates that in order to obtain high application efficiencies, furrow inflow rates must increase with longer furrow lengths.

FURROW IRRIGATION SYSTEM DESIGN FOR CLAY SOILS IN ARID REGIONS