Effect of Pulsating Pressure on Water Distribution and Application Uniformity for Sprinkler Irrigation on Sloping Land

Crops are highly susceptible to drought in sloping land. Due to its good adaptability to complex terrain, sprinkler irrigation is one of the commonly used methods for sloping land. To improve water application uniformity for sprinkler irrigation on sloping land, an experiment was conducted on an artificial slope to determine the effects of pulsating versus constant pressure on sprinkler flow rate, radius of throw, water distribution pattern, and water application uniformity. Compared with sprinkler flow rate and water distribution uniformity at constant pressure, sprinkler flow rate was not reduced, but water distribution uniformity for a single sprinkler was improved due to the decreased uphill throw, downhill throw and the ratio of downhill throw to uphill throw at pulsating pressure. The Christiansen Uniformity Coefficient (CU) value of water distribution for a single sprinkler at pulsating pressure was about 10% higher than that of constant pressure. When water distribution of single sprinkler overlapped with rectangular arrangement, CU values for pulsating pressure were on average 4.06% higher than those for constant pressure with different sprinkler spacings. Thus, pulsating pressure is recommended for use in sprinkler irrigation on sloping land to improve water application uniformity.

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Spatial variability of available water and micro-sprinkler irrigation in cambisol

Revista CERES ◽

10.1590/0034-737x201663060006 ◽

2016 ◽

Vol 63 (6) ◽

pp. 782-788

Author(s):

Larissa Luana Nicodemos Ferreira ◽

Luis César de Aquino Lemos Filho ◽

Marcílio Macêdo Torres ◽

Raimundo Fernandes de Oliveira Júnior ◽

Clara Nívea Costa do Vale ◽

...

Keyword(s):

Spatial Variability ◽

Flow Rate ◽

Sprinkler Irrigation ◽

Sprinkler System ◽

Water Application ◽

Uniformity Coefficient ◽

Water Capacity ◽

Available Water ◽

Available Water Capacity ◽

Distribution Uniformity

ABSTRACT The technology of irrigation is vital for agricultural production. Thus, description of spatial patterns of both water application and available water capacity in the soil, as well as their interactions, is essential to maximize efficiency of water use in irrigated areas. The objective of this study was to analyze spatial variability of available water capacity in the soil and water application via irrigation using geostatistics. The experiment was conducted in a commercial mango orchard in Cambisol irrigated by micro sprinkler system, in the municipality of Alto do Rodrigues, RN. Analyses of descriptive statistics and geostatistics were performed using the programs GeoR and GS+. Geostatistics was found suitable for describing the structure of spatial dependence of available water capacity in the soil and the flow rate distributed in the area by sprinklers. Moreover, even with good results for Christiansen Uniformity Coefficient (CU) and Distribution Uniformity Coefficient (DU), the area showed spatial variability of flow rate.

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Modeling and Dynamic-Simulating the Water Distribution of a Fixed Spray-Plate Sprinkler on a Lateral-Move Sprinkler Irrigation System

Water ◽

10.3390/w11112296 ◽

2019 ◽

Vol 11 (11) ◽

pp. 2296 ◽

Cited By ~ 2

Author(s):

Yisheng Zhang ◽

Jinjun Guo ◽

Bin Sun ◽

Hongyuan Fang ◽

Delan Zhu ◽

...

Keyword(s):

Distribution Pattern ◽

Water Distribution ◽

Irrigation System ◽

Translational Motion ◽

Simulated Data ◽

Sprinkler Irrigation ◽

Distribution Patterns ◽

Superposition Method ◽

Working Pressure ◽

Uniformity Coefficient

Uniformity of water distribution plays an important role in evaluating irrigation quality. As necessities in calculating irrigation uniformity during designing a lateral-move sprinkler irrigation system (LMSIS), the water distribution patterns of individual sprinkler in motion are crucial. Considering the limitation of the experiment platform, dynamic water distribution of an isolated sprinkler is difficult to measure, especially for a fixed spray plate sprinkler (FSPS) which LMSIS has been widely equipped with in China, therefore developing a model to simulate dynamic water distribution of a moving sprinkler is necessary. The objective of this study was to develop and validate the theoretical basis for calculating water distribution characteristics of a single FSPS in translational motion applying a superposition method, and provide an optimized operation management of LMSIS. The theoretical model’s validity was verified in an indoor experiment using a Nelson D3000 FSPS in motion with 36 grooves and blue-plate spray heads. The software was programmed using the Eclipse Platform and the software was capable of simulating water distribution pattern and Christiansen uniformity coefficient (Cu). The results indicated that the water distribution simulated by the software presents three peaks of maximum application under varying conditions, and the value of water application peaks decreased as working pressure and/or mounting height increased. Conversely, the wetted diameter increased as working pressure and/or mounting height increased. Working pressure, mounting height, and sprinkler spacing each had a significant effect on the Cu. The Cu increased as working pressure and/or mounting height increased but decreased as sprinkler spacing increased. As a consequence, the model can be used to predict the relative water distribution pattern; and the Cu can be calculated with the simulated data, thus providing a tool for designing a new LMSIS.

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Water Distribution Uniformity in Driping System Under Growing Pressures

International Journal for Innovation Education and Research ◽

10.31686/ijier.vol7.iss11.1829 ◽

2019 ◽

Vol 7 (11) ◽

pp. 14-21

Author(s):

JHONATAN PIAZENTIN ◽

João Luis Zocoler ◽

Camila Pires Cremasco ◽

Alfredo Bonini Neto ◽

Luís Roberto Almeida Gabriel Filho

Keyword(s):

Flow Rate ◽

Water Distribution ◽

High Efficiency ◽

Environmental Cost ◽

Agricultural Systems ◽

Uniformity Coefficient ◽

Number Of Factors ◽

Cost Reductions ◽

Use Efficiency ◽

Distribution Uniformity

Increasing water use efficiency in agricultural systems is critical as it results in economic and environmental cost reductions, especially in localized irrigation, which depends on a number of factors, especially the flow rate of the emitters and proper uniformity of water distribution, both with respect to direct with the pressure of the emitters For this evaluation the use of coefficients of water uniformity, it is essential to indicate the best wetness management. The experiment was carried out in the Irrigation laboratory, in a test stand, using Christiansen uniformity coefficient - CUC, distribution uniformity coefficient - CUD and statistical uniformity coefficient - CUE. In the irrigation line, four pressures on the drip emitter (5, 10, 15 and 20 mca) were applied. The pressure variations obtained did not reduce the efficiency of the uniformity of water distribution by the drip system, falling into high efficiency ranges for all evaluated coefficients, representing adequate wetting rates.

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A simplified method to improve water distribution and application uniformity for sprinkler irrigation on sloping land: adjustment of riser orientation

Water Science & Technology Water Supply ◽

10.2166/ws.2020.231 ◽

2020 ◽

Author(s):

Xin Hui ◽

Haijun Yan ◽

Lin Zhang ◽

Junying Chen

Keyword(s):

Soil Erosion ◽

Water Distribution ◽

Sprinkler Irrigation ◽

Water Application ◽

Irrigation Systems ◽

Irrigation Projects ◽

Irrigation Uniformity ◽

Simplified Method ◽

Investment Cost ◽

Sloping Land

Abstract To improve the water application uniformity for sprinkler irrigation on sloping land, indoor tests were conducted on an artificial slope (slopes of 0, 0.05, 0.10 and 0.15) to evaluate the effects of two riser orientations, vertical (VO) and perpendicular (PO) to the slope, on the uniformity of sprinkler rotation, radius of throw, water distribution of an individual sprinkler and the overlapped water application uniformity (WAU). Compared with the VO, the PO could effectively improve the water distribution on sloping land and minimize the risk of soil erosion. Additionally, the PO was superior in the WAU, and a rectangular arrangement could dramatically enhance the WAU at smaller sprinkler spacing, while larger acceptable sprinkler spacing was accepted in a triangular arrangement. The riser orientation and sprinkler spacing had the most significant effect on the WAU, followed by the slope and sprinkler arrangement, suggesting that the adjustment of riser orientation or sprinkler spacing was helpful in improving the WAU. However, from the aspects of investment cost and installation convenience for irrigation projects, the method of PO was recommended. Therefore, when designing the sprinkler irrigation systems on the slope, choosing PO is the simplest and most effective way to achieve good irrigation uniformity.

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UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA DE IRRIGAÇÃO POR ASPERSORES COMPENSANTES E NÃO COMPENSANTES EM DIFERENTES ALTURAS

Irriga ◽

10.15809/irriga.2016v21n4p631-647 ◽

2016 ◽

Vol 21 (4) ◽

pp. 631-647 ◽

Cited By ~ 1

Author(s):

Jorge Tomoyoshi Tamagi ◽

Miguel Angel Uribe Opazo ◽

Jerry Adriani Johann ◽

Marcio Antonio Vilas Boas

Keyword(s):

Control Charts ◽

Water Distribution ◽

Sprinkler Irrigation ◽

Northern Region ◽

Statistical Control ◽

Uniformity Coefficient ◽

Irrigation Depth ◽

Distribution Uniformity ◽

And Control ◽

Caixa Postal

UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA DE IRRIGAÇÃO POR ASPERSORES COMPENSANTES E NÃO COMPENSANTES EM DIFERENTES ALTURAS JORGE TOMOYOSHI TAMAGI1; MIGUEL ANGEL URIBE-OPAZO2; JERRY ADRIANI JOHANN2 E MARCIO ANTONIO VILAS BOAS2 1 Universidade Estadual do Oeste do Paraná - UNIOESTE, Doutorando em Engenharia Agrícola no Programa de Pós-Graduação em Engenharia Agrícola – PGEAGRI. Rua Universitária, 2069 – Jd. Universitário – Caixa Postal 711 – CEP 85819-110 – Cascavel – PR, e-mail: [email protected] UNIOESTE, campus de Cascavel – PR, professores e pesquisadores do PGEAGRI, e-mails: [email protected]; [email protected]; [email protected]. 1 RESUMO Este trabalho tem como finalidade contribuir para o desenvolvimento de técnicas adequadas para avaliação de sistemas de irrigação por aspersão, considerando que a uniformidade de distribuição da água afeta diretamente a lâmina bruta de irrigação. O experimento foi conduzido na região Norte de Cascavel, Paraná, (24º 55’ 04” latitude Sul, 53º 28’ 31” longitude Oeste e altitude de 785 m). Foram utilizadas duas parcelas de 10 x 10 m, denominadas S1 e S2, modificando-se somente a altura dos aspersores de 1,5 m para 1,0 m, respectivamente. Em cada parcela foram instalados 100 coletores, 4 aspersores super 10 bocal azul, compensante e, após 32 ensaios, foram substituídos por 4 aspersores super 10 bocal azul, não compensante. Foram determinados os seguintes coeficientes: Uniformidade de Christiansen, Uniformidade de Distribuição e Uniformidade Estatístico. Foram realizados estudos de inferência estatística e criadas cartas de controle para a análise do controle estatístico do processo, além dos índices de capacidade de processo (Cp) e desempenho do processo (Cpk). Os resultados mostraram que o aspersor compensante apresentou melhor desempenho à altura de 1,5 m (C-1,5 m) e que, entre as alturas de 1,0 m e 1,5 m, as melhores uniformidades de distribuição de água ocorreram na altura de 1,5 m. Palavras-chave: inferência estatística; cartas de controle; capacidade de processo. TAMAGI, J. T.; URIBE-OPAZO, M. A.; JOHANN J. A.; VILAS BOAS, M. A. IRRIGATION WATER DISTRIBUTION UNIFORMITY BY COMPENSATING AND NON-COMPENSATING SPRINKLERS AT DIFFERENT HEIGHTS 2 ABSTRACT The uniformity of water application is an important factor to be considered in the assessment of sprinkler irrigation systems, since it directly affects gross irrigation depth, This work is a contribution for the development of appropriate techniques for assessment of results to improve the system. This trial was conducted in the Northern region of Cascavel-PR (24º 55' 04" S, 53º 28' 31" W). Two 10 x 10 m plots were used and described as S1 and S2, according to the heights’ change of sprinklers, from 1.5 to 1.0 m, respectively. There were 100 collectors in each plot, plus 4 Super 10-blue-nozzle pressure compensating sprinklers, and, after 32 essays, they were replaced by 4 Super 10-blue-nozzle non pressure compensating sprinklers. The following coefficients were determined: Christiansen uniformity coefficient (CUC), coefficient of uniformity of distribution (CUD) and statistical uniformity coefficient (SUC). Statistical inference studies were carried out and control charts were generated to analyze the statistical control of the process, as well as Cp and Cpk indices. The results showed the best performance with the pressure compensating sprinklers irrigation at 1.5 m high (C-1.5 m) and that among the 1.0 m and 1.5 m heights the best water distribution uniformity was with the 1.5 m height. Keywords: Statistical analysis; Control Charts; Process Capacity.

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ANÁLISE DOS COEFICIENTES DE UNIFORMIDADE DE APLICAÇÃO DE MICROASPERSORES

Irriga ◽

10.15809/irriga.2016v1n01p89-98 ◽

2018 ◽

Vol 1 (01) ◽

pp. 89

Author(s):

Luiz Fabiano Palaretti ◽

José Renato Zanini ◽

Diego Augusto Vechiato ◽

Alexandre Barcellos Dalri ◽

Rogério Teixeira de Farias

Keyword(s):

Constant Pressure ◽

Test Time ◽

State University ◽

University Campus ◽

Water Application ◽

Uniformity Coefficient ◽

Operating Range ◽

Coefficient Variation ◽

Total Absence ◽

Distribution Uniformity

ANÁLISE DOS COEFICIENTES DE UNIFORMIDADE DE APLICAÇÃO DE MICROASPERSORES LUIZ FABIANO PALARETTI1; JOSÉ RENATO ZANINI1; DIEGO AUGUSTO VECCHIATO1; ALEXANDRE BARCELLOS DALRI1 E ROGÉRIO TEIXEIRA DE FARIA1 1Departamento de Engenharia Rural, FCAV/Unesp, Via de acesso Prof. Paulo Donato Castellane, s/n, 14884-900, Jaboticabal, São Paulo, Brasil, email: [email protected], [email protected], [email protected], [email protected], [email protected] 1 RESUMO O objetivo deste trabalho foi analisar a uniformidade de aplicação de água e o padrão de molhamento dos microaspersores DAN 2001 e DAN 2002, conforme a ABNT (2004). O ensaio foi conduzido na Universidade Estadual Paulista, Jaboticabal, SP. O tempo de teste foi de 1 hora sob pressão constante de 250 kPa e total ausência de vento, com 3 repetições. Foram determinados os coeficientes de uniformidade de distribuição (CUD) e de Christiansen (CUC) e o padrão de molhamento dos microaspersores. Os valores médios de CUC para ambos os microaspersores foi classificado como “bom” alcançando 80,22% e 83,21% para o DAN 2001 e DAN 2002, respectivamente. Os valores médios de CUD foram 71,35% (DAN 2001) e 75,39% (DAN 2002), ambos classificados como “bom”. Os valores médios de CUC e CUD não diferiram entre si pelo teste de Tukey (p³0.05), apresentando valores de coeficiente de variação de 6,52 e 10,77, respectivamente. O padrão de molhamento apresentou maiores intensidades de aplicação (4,0 – 5,0 mm h-1) nos primeiros 0,25 m de distância do microaspersor, decrescendo com o aumento da distância, com intensidades de 2,0 a 3,0 mm h-1 a 2,25 m. Palavras-chave: sobreposição, emissores, raio de alcance PALARETTI, L. F.; ZANINI, J. R.; VECCHIATO, D. A.; DALRI, A. B.; FARIA, R. T. ANALYSIS OF APPLICATION UNIFORMITY COEFFICIENT OF THE MICROSPRINKLERS 2 ABSTRACT The aim of this study was to analyze water application uniformity and wetness pattern of microsprinklers DAN 2001 and DAN 2002 according to ABNT NBR (2004). The test was conducted in Paulista State University, campus of Jaboticabal, SP. The test time was 1 hour under a constant pressure of 250 kPa and total absence of wind, with 3 replications. The distribution uniformity coefficient (CUD); uniformity (CUC) and wetness pattern of microsprinklers were determinated. The average values of CUC for both microsprinklers were described as "good", reaching 80.22 and 83.21% for the DAN 2001 and DAN 2002, respectively. The average values of CUD were 71.35% (DAN 2001) and 75.39% (DAN 2002), both described as "good". The average values of CUC and CUD did not differ in Tukey tests (p³0.05), with coefficient variation values of 6.52 and 10.77, respectively. The wetness pattern showed higher intensities application (4.0 to 5.0 mm h-1) for the first 0.25 m distance from the microsprinklers, decreasing with increasing distance, with intensities from 2.0 to 3.0 mm h-1 at 2.25 m. Keywords: overlapping, emitters, operating range

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INFLUENCE OF THE WATER DISTRIBUTION UNIFORMITY AND IRRIGATION DEPTH ON THE YIELD OF IRRIGATED BEAN CROP

Irriga ◽

10.15809/irriga.2009v14n4p458-469 ◽

2009 ◽

Vol 14 (4) ◽

pp. 458-469 ◽

Cited By ~ 1

Author(s):

Everardo C. Mantovani ◽

Gregório G. Faccioli ◽

Brauliro Gonçalves Leal ◽

Antonio Alves Soares ◽

Luis Claudio Costa ◽

...

Keyword(s):

Water Depth ◽

Water Distribution ◽

Irrigation System ◽

Winter Season ◽

Sprinkler Irrigation ◽

Field Capacity ◽

Uniformity Coefficient ◽

Irrigation Depth ◽

Distribution Uniformity ◽

Bean Crop

INFLUENCE OF THE WATER DISTRIBUTION UNIFORMITY AND IRRIGATION DEPTH ON THE YIELD OF IRRIGATED BEAN CROP Everardo C. Mantovani1; Gregório G. Faccioli2; Brauliro Gonçalves Leal3;Antônio Alves Soares1; Luis Cláudio Costa1; Paulo Sérgio L. Freitas4 1Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, MG [email protected]úcleo de Estudos e Pesquisas do Nordeste, Universidade Federal de Sergipe, São Cristovão, SE3Intec Consultoria e Assessoria Ltda, Viçosa, MG4Departamento de Agronomia, Universidade Estadual de Maringá, Maringá, PR 1 ABSCTRACT This study aimed to evaluate the influence of the water distribution uniformity and three irrigation depths on the production variables for the bean crop, using a conventional sprinkler irrigation system, during the winter season. The treatments consisted of three irrigation depths and two uniformity levels of water distribution represented by the Christiansen uniformity coefficient (CUC). In the treatments L1A and L1B a sufficient water depth was applied to raise the soil water content to field capacity. The distribution uniformities (CUCs) were higher and lower than 80%, respectively. In treatments L2A and L3A, and L2B and L3B, the applied water depths corresponded to 50% and 150% of that applied to the LIA treatment. Because of rainfall events until the sampling date, no significant differences at 5% probability were found among treatments, when the variables were: leaf number, leaf area and dry matter. The F test for the contrast among the treatments with high and low uniformity was significant at 5% probability, when using 50% replacement of the water depth required by the crop. Significant differences were observed at 5% probability for pod number per plant among the treatments, when using 150, 100 and 50% replacement of the water depth required by the crop KEYWORDS: irrigation uniformity, sprinkler irrigation, yield. MANTOVANI, E. C.; FACCIOLI, G. G.; LEAL, B. G.; SOARES,A. A.; COSTA, L. C.; FREITAS, P. S. L. INFLUÊNCIA DA UNIFORMIDADE DE DISTRIBUIÇÃO DE ÁGUA E LÂMINA DE IRRIGAÇÃO NA PRODUTIVIDADE DO FEIJÃO 2 RESUMO O presente trabalho teve como objetivo avaliar a influência da uniformidade de distribuição de água e de três lâminas de irrigação nas variáveis de produção da cultura do feijão, utilizando um sistema de aspersão convencional, no período de inverno. Os tratamentos constaram de três lâminas de irrigação e dois níveis de uniformidade de distribuição de água, representados pelo coeficiente de uniformidade de Christiansen (CUC). Nos tratamentos L1A e L1B foi aplicada uma lâmina de água suficiente para elevar a umidade do solo à capacidade de campo, com uniformidade de distribuição (CUC) maior e menor que 80%, respectivamente. Nos tratamentos L2A e L3A, e L2B e L3B as lâminas aplicadas foram, respectivamente, 50% e 150% da lâmina aplicada no tratamento L1A. Não existiram diferenças significativas, a 5% de probabilidade, nos tratamentos para seguintes variáveis: número de folhas, área foliar e matéria seca, em razão das chuvas ocorridas até a data da amostragem. O teste F para o contraste entre os tratamentos de alta e baixa uniformidade com 50% de reposição da lâmina requerida pela cultura foi significativo a 5% de probabilidade. Observou-se diferenças significativas, a 5% de probabilidade entre os tratamentos com 150, 100 e 50% de reposição da lâmina requerida pela cultura, para o número de vagens por planta. UNITERMOS: Uniformidade de irrigação, irrigação por aspersão, produtividade.

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Influence of the wind on water application uniformity of a mechanical lateral move irrigation equipment using rotating plate sprinklers

Ciência Rural ◽

10.1590/0103-8478cr20141558 ◽

2015 ◽

Vol 46 (1) ◽

pp. 83-88 ◽

Cited By ~ 4

Author(s):

Lessandro Coll Faria ◽

Samuel Beskow ◽

Alberto Colombo ◽

Bernardo Gomes Nörenberg ◽

Osvaldo Rettore Neto ◽

...

Keyword(s):

Water Distribution ◽

Uniform Space ◽

Sprinkler Irrigation ◽

Soil Surface ◽

Negative Influence ◽

Sprinkler System ◽

Water Application ◽

Rio Grande Do Sul ◽

Distribution Uniformity ◽

Rotating Plate

ABSTRACT: Investigations demonstrate that the wind is the factor that causes the biggest negative influence on water application of sprinkler irrigation systems. Therefore, this paper aims to evaluate, in in-field conditions, the influence of wind on the water distribution uniformity of a mechanical lateral move sprinkler system used for irrigation in rice crop in the South of Rio Grande do Sul State, Brazil. The equipment is located at the Campo Experimental de Terras Baixas (ETB) of EMBRAPA/CPACT and operates with water emitters model I-Wob installed in drop tubes in a distance of 2.8m above the soil surface, having a uniform space of 2.3m between each other and pressure regulators of 68.9kPa. Sixteen in-field evaluations were done and they permitted to infer that the higher is the wind speed, the lower are the values of Christiansen Uniformity (CU) and of Distribution Uniformity (DU) coefficients. Besides, it can be affirmed that even in unfavorable wind conditions, the mechanical lateral move irrigation equipment presented desirable indexes of water application uniformity.

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COMPOSIÇÃO DE PERFIS RADIAIS DE DISTRIBUIÇÃO DE ÁGUA DE ASPERSORES

Irriga ◽

10.15809/irriga.2009v14n1p41-53 ◽

2009 ◽

Vol 14 (1) ◽

pp. 41-53 ◽

Cited By ~ 4

Author(s):

Giuliani Do Prado ◽

Alberto Colombo

Keyword(s):

Key Words ◽

Flow Rate ◽

Linear Relation ◽

Water Distribution ◽

Test Bench ◽

Application Rate ◽

Water Application ◽

Irrigation Uniformity ◽

Nozzle Configuration ◽

Composition Process

COMPOSIÇÃO DE PERFIS RADIAIS DE DISTRIBUIÇÃO DE ÁGUA DE ASPERSORES Giuliani do Prado; Alberto ColomboDepartamento de Engenharia, Universidade Federal de Lavras, Lavras, MG, [email protected] 1 RESUMO Este trabalho descreve um procedimento de composição do perfil radial de aspersores que operam com dois bocais. Foram determinados na bancada de ensaios de aspersores da Universidade Federal de Lavras, em Lavras/MG, os valores de vazão e perfil radial do aspersor PLONA-RL250 operando, individualmente, com os bocais principais 14 e28 mme com os bocais auxiliares 5, 6 e7 mm, e operando, nas diferentes seis combinações de bocal auxiliar e principal do aspersor, sob cinco pressões de serviço (292, 392, 490, 588 e 696 kPa). No processo de composição do perfil radial realizado, ajustando a vazão dos bocais auxiliar e principal, operando individualmente, a vazão do aspersor operando com o conjunto de bocais auxiliar e principal, verificou-se um coeficiente de determinação médio de 88,57% entre as intensidades de precipitação adimensionais dos perfis radiais compostos com os perfis radiais do conjunto. Na relação linear, ajustada, entre os valores de uniformidade de equipamentos autopropelidos de irrigação, obtidos com os perfis radiais compostos e do conjunto, a inclinação da reta foi igual a 44°12’com um erro relativo médio de 2,34%. Estes resultados mostram que o procedimento de composição do perfil radial de aspersores não influencia, de maneira significativa, na uniformidade de aplicação de água de aspersores. UNITERMOS: bocais do aspersor, vazão do aspersor, uniformidade de irrigação. PRADO, G. DO; COLOMBO, A. SPRINKLER WATER DISTRIBUTION COMPOSITIONS 2 ABSTRACT This paper described a procedure to compose a sprinkler pattern for a sprinkler that operates with two nozzles. To compose the pattern, discharge values and patterns of the PLONA-RL250 sprinkler were determined at the sprinkler test bench of the Universidade Federal de Lavras, in Lavras/MG. The tests were conducted with all possible combinations using 14mm and28 mmmain nozzles and the 5, 6 and7 mmauxiliary nozzles as well as with each nozzle functioning individually. Five working pressures (294, 392, 490, 588 and 686 kPa) were used for each nozzle configuration. In the pattern composition process, by adjusting the main and auxiliary nozzle discharges operating individually, and by adjusting the sprinkler discharge operating with the corresponding pair of main and auxiliary nozzles, it was verified that the average determination coefficient was 88.57% between the dimensionless water application rate of the composed and pair patterns. In the adjusted linear relation, between the uniformity values of a travel irrigation machine obtained from the composed and pair patterns, the inclination was 44° 12' with an average relative error of 2.34%. These results show that the procedure to compose a sprinkler pattern for sprinklers does not influence significantly the water application uniformity of sprinklers. KEY WORDS: sprinkler nozzles, sprinkler flow rate, irrigation uniformity

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