Application of sand and geotextile envelope in subsurface drip irrigation

Abstract

Subsurface drip irrigation is a technology used for better management of irrigation water. This technique is 
more desirable in arid and semi-arid region, because of decreasing soil surface evaporation and more efficiency 
of irrigation system in comparison with the other irrigation systems. In addition, this system is a safer way for 
treated wastewater (TWW) reuse in irrigation lands. But roots and clay particles can clog drip emitters in 
systems buried below the soil surface. In this paper, sand and geotextile filtration methods have been 
suggested for solving root intrusion and biological plugging problems for subsurface drip applications. Sand 
envelope around the emitters has been recommended for deeper root zone and long term application of system, 
while geotextile envelope is suitable for seasonal crops with shallow root.