COMPARATIVE ANALYSIS METHODOLOGY OF COLLECTING DATA FOR IRRIGATION SYSTEMS ASSESSMENT LOCALIZED

In certain situations, the evaluation of 32 or more emitters for irrigation sector can be very laborious, it being possible for the measurement at only 16 points is sufficient to determine the uniformity of the water system. The research objective with this work propose a methodology to be used in the field to determine the uniformity of irrigation small localized irrigation systems. The estimated irrigation system was installed on a particular production lot, grown with the culture of guava, located in Acaraú Low Irrigation District belonging to the National Department of Works Against Drought. For the assessment of uniformity of water distribution were used four different methods: standard methodology (Christiansen, 1942), which is the collection of data on all issuers of the area to be assessed; methodology proposed by Denículi et al. (1980), which consists of data collection 32 issuers; methodology proposed by Keller & Karmeli (1975) which is the collection of 16 issuers and methodology proposed by this study, which is a collection of 9 issuers data. The results of this field work showed that the evaluated system showed low efficiency, according to the values of the coefficients of uniformity and application efficiency, which performed far below the recommended by the specialized literature on the subject. The use of the methodology proposed in this study proved to be acceptable for evaluation of trickle irrigation systems similar to those used in this study, ie small.