EFFECT OF IRRIGATION UNIFORMITY VALUES ON WATER DEPTHS FOR CENTER PIVOT SPRINKLER IRRIGATION SYSTEM

A field experiments was carried out under the center pivot sprinkler irrigation system (valley) in a study loam texture soil in AL-Anbar governorate-36 AL-Jabal province located 15 km North-East of AL-Ramadi. The study aimed the evaluate performance of center pivot sprinkler irrigation system by knowing the effect of uniformity coefficient values in the low water depths. Percent of the device speed was calibrated with the low water depths, the relation was studied between the devise speed and uniformity coefficient, also between the irrigation uniformity and the operational of pressure. The study results showed the following: (i) The increase of Law water depths which decrease the device speed percent, the increase percent was about 300.87% and 143.48% when decreasing the speed percentage from 100% to 50% and 25%, respectively, (ii) The uniformity coefficient reached the maximum at 90.78 with 2 pound inch(-2) operational pressure, and (iii) The value of irrigation uniformity did not change with the varying of device speed percentage at the constant operational pressure depended on this study (25 pound inch(-2)).