Assessment of Modern Irrigation Systems in Qom Province

In the present study, the state of pressurized irrigation systems in Qom province was investigated. Regarding the fact that by 2016, 81% of pressurized irrigation systems in this province are local and 19% are sprinkler, therefore, 11 local and 3 sprinkler irrigation systems (including solid-set with portable sprinklers, wheel move, and center pivot) were selected for investigation. First, the water and soil characteristics of the fields were studied then coefficient of uniformity (CU), distribution uniformity (DU), the yield of potential application efficiency of low quarter (PELQ), the yield of application efficiency of low quarter (AELQ) and adequacy of irrigation (ADirr) indexes were calculated. Obtained results showed that the mentioned indexes were 74.6, 60.8, 62.6, 62.6, 62% for solid-set with portable sprinkler, 57.6, 44.7, 76.1, 71.3, 86% for wheel move, and 81, 63, 85, 85, 71% for center pivot, respectively, and the weighted average of DU, PELQ and AELQ for local irrigation were 53.9, 45.3 and 53.9 %, respectively. Finally, the observed problems of system operation were analyzed and it was found that the main reasons of low performance were due to the management and some were due to the design and performance phases.