American Society of Civil Engineers


Soil Hydraulic Properties Affecting Discharge Uniformity of Gravity-Fed Subsurface Drip Irrigation Systems


by N. Lazarovitch, (Lect., The Wyler Dept. of Dryland Agric. Jacob Blaustein Institutes for Desert Res., Ben-Gurion Univ. of the Negev, Sede Boqer Campus, 84990, Israel; formerly, Postdoctoral Student, Dept. of Soil, Water, and Envir. Sci., Univ. of Arizona, Tucson, AZ 85721. E-mail: lazarovi@bgu.ac.il), U. Shani, (Sr. Lect., Dept. of Soil and Water Sciences, Fac. of Agric., Food and Envir. Quality Sciences, Hebrew Univ. of Jerusalem, Rehovot 76100, Israel. E-mail: shuri@agri.huji.ac.il), T. L. Thompson, (Chair and Prof., Dept. of Plant and Soil Sci., Texas Tech Univ., Lubbock, TX 79409; formerly, Prof., Dept. of Soil, Water, and Envir. Sci., Univ. of Arizona, Tucson, AZ 85721. E-mail: thomas.thompson@ttu.edu), and A. W. Warrick, (Prof., Dept. of Soil, Water, and Envir. Sci., Univ. of Arizona, Tucson, AZ 85721. E-mail: aww@ag.arizona.edu)

Journal of Irrigation and Drainage Engineering, Vol. 132, No. 6, November/December 2006, pp. 531-536, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9437(2006)132:6(531))

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Document type: Journal Paper
Abstract: The use of subsurface drip irrigation (SDI) is increasing for many reasons, including its many agronomic advantages and the ability for safe application of wastewater to crops. In contrast to surface drip irrigation, soil hydraulic properties may affect SDI performance, particularly for new SDI systems designed to operate under low pressure (e.g., 2 m of head). This work introduces a new approach for solving problems of predicting discharge in SDI laterals. We accomplish this by coupling models of head loss in laterals and soil impacts on dripper discharge. The coupled model enables an evaluation of the performance of SDI laterals while changing inputs, such as the lateral diameter, length and slope, dripper nominal discharge and exponent, inlet pressure head, soil hydraulic properties, and soil spatial variability. This model is used to determine the coefficient of variation of discharge for two numerical comparisons.


ASCE Subject Headings:
Trickle irrigation
Hydraulic models
Uniform flow
Spatial distribution
Soil permeability