The use of a sprinkler irrigation system is becoming more popular to reduce water
consumption and increase irrigation efficiency. Irrigation uniformity plays an important role in the
performance of the sprinkler irrigation system. The use of low operating pressure instead of high
operating pressure system offer many benefits including energy and water saving. An experimental
study was performed using two systems; a square 12x12 m system and a rectangular 10x12 m system
to investigate irrigation uniformity based on soil moisture content of the sprinkler irrigation system
under low operating pressure. In addition, irrigation uniformity was compared based on water
application and soil moisture content. In this study, different low operating pressures (62, 82, 102 and
122 KPa) were selected. Different nozzle diameters (4, 5, 6 and 7 mm) and different riser heights (0.5,
0.75, and 1.0 m) were also used. The soil moisture content uniformities of 10 min after irrigation are
more dependent on the initial soil moisture content uniformity than any other design factor. It is also
less influenced by water application uniformity.