Evaluating Center Pivot Distribution Uniformity from Catch Can Tests

2009 ◽  
Author(s):  
J C Henggeler ◽  
E D Vories
Keyword(s):  
Center Pivot ◽  
Distribution Uniformity

scholarly journals Center Pivot Sprinkler Distribution Uniformity Impacts on the Spatial Variability of Evapotranspiration

2015 ◽  
Vol 141 (8) ◽  
pp. 04014085
Author(s):  
Daniel J. Howes ◽  
Sean Ellenson ◽  
Lucas Hoffmann ◽  
Franklin Gaudi
Keyword(s):  
Spatial Variability ◽  
Center Pivot ◽  
Distribution Uniformity

Comparison of Surface and Subsurface Water Distribution Uniformity Under Center Pivot Irrigation System for Sugarcane in Colombia

Sugar Tech ◽  
2020 ◽  
Vol 22 (6) ◽  
pp. 1032-1037
Author(s):  
Christian José Mendoza ◽  
Javier Alí Carbonell ◽  
Jhon Jairo Lasso
Keyword(s):  
Water Distribution ◽  
Irrigation System ◽  
Subsurface Water ◽  
Center Pivot ◽  
Distribution Uniformity

scholarly journals Impact of the Intermittency Movement of Center Pivots on Irrigation Uniformity

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1167
Author(s):  
Abdelmoneim Z. Mohamed ◽  
R. Troy Peters ◽  
Abid Sarwar ◽  
Behnaz Molaei ◽  
Don McMoran
Keyword(s):  
Cycle Time ◽  
High Speed ◽  
Travel Speed ◽  
Movement Direction ◽  
Irrigation Uniformity ◽  
Center Pivot ◽  
Go Model ◽  
Distribution Uniformity ◽  
Coefficient Of Uniformity ◽  
Move Distance

A computer model was developed to simulate the varying depths of water applied to the ground due to the intermittent movements of a typical center pivot. The stop–go model inputs include the sprinkler application depth, the sprinkler pattern, that pattern’s wetted radius, the center pivot’s % timer setting, the move cycle time, and the end tower maximum travel speed. The model outputs were the depth of application in the pivot’s movement direction, the distribution uniformity (DU), and the coefficient of uniformity (CU). The results revealed that the pivot circular application uniformity is mostly a function of the move distance as a percent of the sprinklers’ wetted radius. This, in turn, is a function of the percent timer setting, the cycle time, and the end tower travel speed. Due to this, the high-speed center pivots had corresponding lower application uniformities compared to low-speed machines, and sprinklers with larger wetted radii resulted in better uniformity. Shortening the cycle time also resulted in higher uniformity coefficients. Based on these results, it is recommended that the run time be set based on the pivot end-tower’s travel speed and sprinkler wetted radius, such that the end tower move distance is equivalent to the sprinkler wetted radius. This will reduce wear to the tower motors due to the on–off cycling, especially for slow travel settings and for sprinklers with larger wetted radii. The ponding depths at different percent of the move distance, for the potential runoff, were estimated, which were set to be equivalent to the wetted radius.

scholarly journals EVALUATION CENTER PIVOT SYSTEMS USING NEW AND OLD SPRAYS AND PRESSURE REGULATORS

Irriga ◽  
2001 ◽  
Vol 6 (1) ◽  
pp. 42-47
Author(s):  
Antonio Evaldo Klar ◽  
Renato De Castro Santana ◽  
Charles Duroha
Keyword(s):  
Performance Characteristics ◽  
Irrigation Systems ◽  
Uniformity Coefficient ◽  
Hydraulic Conditions ◽  
Center Pivot ◽  
Distribution Uniformity ◽  
Water Depths

EVALUATION CENTER PIVOT SYSTEMS USING NEW AND OLD SPRAYS AND PRESSURE REGULATORS  Antonio Evaldo KlarRenato de Castro SantanaCharles DurohaDepartamento de Engenharia Rural – FCA/UNESP18603-970 – Botucatu/SP Fone: (0xx14)6802-7165; Fax: 6802-7194,[email protected]  1 ABSTRACT The objectives of this study were to appraise the performance characteristics for two center pivot irrigation systems (1 and 2) installed on identical areas with different hydraulic conditions: new and old pressure regulators and sprays and the wear out of the equipments. The experiment was been conducted in the Madeira Farm, Silvânia, GO.The Christiansen Uniformity Coefficient (CUC) was been used for the evaluation of the efficiency of systems. The values gotten for the CUC showed that there was an increase in 24.22% and 9.2% after changing old for the new kits and the water depths were 9.20 and 25.02% lower before changing the kits, for pivots 1 and 2, respectively. KEYWORDS: center pivot irrigation, distribution uniformity, old and new pressure regulators and sprays.  KLAR, A.E.,SANTANA, R.C., , DUROHA, C. AVALIAÇÃO DE SISTEMAS DE IRRIGAÇÃO POR PIVÔ CENTRAL USANDO DIFUSORES E REGULADORES DE PRECISÃO USADOS E NOVOS  2 RESUMO Os objetivos deste trabalho foram: 1. avaliar as características de desempenho de dois equipamentos de irrigação por pivô central (pivôs 1 e 2), com áreas idênticas, mas em condições hidráulicas diferentes, com reguladores de pressão e difusores novos e usados; 2. através de comparações, quantificar o desgaste do equipamento em condições de campo.Para a avaliação do desempenho dos sistemas, utilizou-se o coeficiente de uniformidade de Christiansen (CUC). Os ensaios foram realizados na Fazenda da Madeira, no município de Silvânia - GO. Os valores encontrados para os coeficientes de uniformidade demonstraram que após a troca dos kits de difusores e de reguladores de pressão, os CUC’s aumentaram em 24,22 % e 34,76 % e as lâminas aplicadas, com os kits usados, foram inferiores ao kits novos em 9,2 % e 25,06%, nos pivôs 1 e 2 respectivamente. UNITERMOS: irrigação por pivô central, uniformidade de distribuição, reguladores de pressão e difusores novos e usados. 

Spray irrigation on dairy pastures - efficient or not?

2006 ◽  
pp. 177-181
Author(s):  
S.M. Thomas ◽  
D. Bloomer ◽  
R.J. Martin ◽  
A. Horrocks
Keyword(s):  
Irrigation System ◽  
Groundwater Resources ◽  
Dairy Farmers ◽  
Large Variability ◽  
Irrigation Application ◽  
Irrigation Uniformity ◽  
Survey Results ◽  
Spray Irrigation ◽  
Use Efficiency ◽  
Distribution Uniformity

Applying water efficiently is increasingly important for dairy farmers and other users of surface and groundwater resources to maintain sustainable production. However, irrigation is rarely monitored. We used a questionnaire survey and measurements of five spray irrigation systems working in normal farm conditions to make observations on how efficiently irrigation is being managed. Survey results from 93 dairy farmers showed that, although the farmers believe they know how much water is being applied during irrigation, only 60% make measurements, and about 18% measure irrigation uniformity. Catch-can measurement of irrigation application depth for the different spray systems indicated large variability in application depths during irrigation, and field distribution uniformity ranged greatly between the different systems, decreasing in the order of centre pivots >travelling irrigators> K-line. Changes in irrigation system settings were sometimes made without considering application depths or uniformity. If our five case studies are typical, they may explain the large range of seasonal irrigation amounts recorded in the survey. We recommend that farmers monitor irrigation application depths and uniformity to help manage irrigation water efficiently and to help them estimate the value of irrigation to their enterprise. Keywords: distribution uniformity, water use efficiency, catch cans

CALCULATION PARAMETERS OF SPRINKLING MACHINES WITH COMBINED FRONTAL AND CIRCULAR MOVEMENT

1970 ◽  
pp. 4-7
Author(s):  
N. N. Dubenok ◽  
G. V. Olgarenko ◽  
B. S. Gordon
Keyword(s):  
Calculated Data ◽  
Irrigation Scheduling ◽  
Natural Conditions ◽  
Linear Mode ◽  
Irrigation Technology ◽  
Irrigated Area ◽  
Center Pivot ◽  
Irrigation Technologies ◽  
The Given ◽  
Operation Characteristics

If the center pivot or linear moving irrigation machines are operated with their own individual irrigation technologies, but the irrigation machines with combined center-pivot and linear moving mode are operated on one field in turn as a center pivot and as a linear. The goal of this work is creation of theoretical base for calculation of improved irrigation machines parameters and existing irrigation equipment modernizing, according to the different natural conditions. The research object is investigation of characteristics of rain delivered from irrigation machines with combined center-pivot and linear moving mode, assuring uniform irrigation distribution according to the irrigation technology and operation parameters, size and configuration of seasonal norm as well as to the irrigation scheduling. The pointed goal is achieved by the given problem solving, when having basic data on the irrigation norm and time, as well as operation characteristics and the irrigation area configuration, the predicted hydro modulus are calculated for the irrigation machine working in a center pivot and in a linear mode. The simulation of sprinkling devices operation on the machine is made by one universal formula, when on the plots irrigated in center pivot and linear mode is achieved equality of arranged hydro modulus to the corresponding calculated data. At that, are considered all the possible combinations of the total irrigated area parts, irrigated with different technologies.

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