Abstract
Horizontal porous pipe method is one of the most efficient systems of irrigation in arid and semi-arid areas. The main aim of this study is to simulate the subsurface horizontal porous pipe irrigation under different conditions. By this method of irrigation, an optimum amount of water is reached to the crop. Moreover, it saves more water than the other irrigation systems. Simulation models by HYDRUS/2D are described the distribution of wetting shapes in two different soil textures through the system of United States Department of Agriculture, USDA, namely as loam and silt soils. The system is designed for three diameters of 6, 7, and 8 cm installed at 15, 20, and 25 cm below the soil surface under three application heads of 25, 50, and 75 cm. Horizontal and vertical advance of the wetting front shapes in loam are greater than silt soil. The numerical values of horizontal and vertical advance are compared with those of predicted by the formulas, showing that average relative error values not more than 2 %. This indicated that the formulas may be used as a tool for designing and investigating the subsurface horizontal porous pipe irrigation system.
Highlights
Irrigation system with subsurface horizontal porous pipe is a suitable method by reducing deep percolation and evaporation through applying a low level of water
The clay pipes were buried at a depth of 25 cm under the soil surface. They found that the rate of seepage and the hydraulic conductivity of the porous pipe are influenced by the materials which use for making the porous pipe
The model is described as two parts of cells; the first part is indicted to the cells along the soil surrounding the horizontal pipe, thereby the second part of cells is the horizontal porous pipe
Summary
Irrigation system with subsurface horizontal porous pipe is a suitable method by reducing deep percolation and evaporation through applying a low level of water. Et al (3) simulated the infiltration from a subsurface clay pipe irrigation by using a computer program and validated with a laboratory experiment They found that the shape of the wetted zone is sensitive to the applied water and the depth of the installation. Et al (19) assessed the viability of the porous pipes irrigation as a technique of water conservation They conducted an experimental study on an area of sandy loam with segments of 40 cm length of clay pipe buried at a depth of 0.43 m. Et al (9) studied the effect of porous pipe characteristics by carrying out laboratory experiments under a system of subsurface irrigation which is negative pressure difference This system is effective in management of irrigation water and can be used as alternative to other traditional methods with efficiency ranges from 0.94 to 0.97.
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