SUBSURFACE TRICKLE IRRIGATION SYSTEM EVALUATION AS RELATED TO WATER FLOW IN SOIL AND EMITTER

Document Type : Original Article

Authors

1 Prof., Ag. Eng. Dept., Fac. of Ag., Menoufia Univ., Egypt.

2 Lecturer, Ag. Eng. Dept., Fac. of Ag., Menoufia Univ., Egypt.

3 Master researcher., Ag. Eng. Dept., Fac. of Ag., Menoufia Univ., Egypt.

Abstract

The purpose of this study was to evaluate subsurface trickle irrigation system as related to water flow in soil and emitter  when the discharge of a subsurface emitter becames larger than the soil infiltration intake creating soil back pressure from soil on emitter flow . Field experiments were conducted for 50 m of lateral length φ13.6 inner diameter and 0.5 m spacing was tested under 100 and  150 kPa inlet pressure for  4 and  8 l/h emitter flow rate. Both of them were on soil surface except subsurface emitters that connected to lateral using micro-tube φ 4 mm and set 0.2 m depth from soil surface. Several points were taken into consideration, such as, pressure variation, manufacturing variation, flow rate, hydraulic variation, field emission uniformity ,field uniformity coefficient and wetted distribution area directly after irrigation and soil – water distribution area. They showed that pressure head decreased as lateral length increased. Pressure variation along lateral increased as emitter flow rate increased. pressure head losses increased by the increase of inlet pressure due to increasing emitter flow rate. Furthermore, emitter flow rate decreased in subsurface trickle irrigation compared with surface trickle irrigation, the flow rate decrease has happened because of the increase of soil pressure ( ) at the emitter outlet, also ( ) is very sensitive to the formed spherical cavity radius

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References

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