Application Rates and Runoff in Center-Pivot Sprinkler Irrigation

Kincaid, D. C.; Heermann, Dale F.; Kruse, E. Gordon

doi:10.13031/2013.38955

Cited by 33 publications

(29 citation statements)

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“…6 is highly empirical, and the constants (k and n) have no physical interpretation, this function has been used to describe the infiltration under all types of irrigation systems including center-pivot systems (8). The Soil Conservation Service has classified soils into intake families using a modification of Eq.…”

Section: Rlmentioning

confidence: 99%

“…The integral of the intake-function can be written as The first variable needed in the calculation of the modified intake rate is the time to surface saturation, t s . The procedure used to calculate t s is similar to that proposed by Kincaid, et al (8). The parameter t s is the time at which the modified intake function is equal to the application rate (Fig.…”

Section: Ar(t)dt Jomentioning

confidence: 99%

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Suitability of Reduced Pressure Center‐Pivots

Gilley

1984

J. Irrig. Drain Eng.

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Selection criteria for reduced pressure center-pivot irrigation systems are developed. An analysis of the combined effects of the application rate characteristics or center-pivot irrigation systems and the Soil Conservation Service (SCS) soil intake family curves is used to determine the maximum depth of water which could be applied per irrigation for various types of soils and sprinkler packages. These irrigation depths are used to determine guidelines for proper selection of reduced pressure center-pivot systems. The results can be used as a general guide to determine if a particular system may have a runoff problem under a given situation.

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Section: Rlmentioning

confidence: 99%

Section: Ar(t)dt Jomentioning

confidence: 99%

Suitability of Reduced Pressure Center‐Pivots

Gilley

1984

J. Irrig. Drain Eng.

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“…Temporal variations in the value of the application rate of water in central pivot are analyzed under the assumption that during the time interval corresponding to the time of wetting, the application rate of water follows a template elliptical (KINCAID et al, 1969;DILLON et al, 1972;GILLEY, 1984;BERNUTH & GILLEY, 1985). However, others believe that the parabolic profile (LUZ & HEERMANN, 2005) or the trapezoidal pattern (DEBOER et al, 2001;KINCAID, 2005) are more suitable.…”

Section: Introductionmentioning

confidence: 99%

Water distribuition characteristics and soil loss of LEPA Quad-Spray emitter nozzles

et al. 2013

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ABSTRACT:The objective of this study was to characterize water application rate, water application pattern width, flow rate, water distribution uniformity and soil loss caused by nozzles of the Low Energy Precision Aplication (LEPA) type Quad-Spray emitter. The study was carried out at the Hydraulic and Irrigation Laboratory of the Department of Engineering at the Federal University of Lavras, in Lavras, state of Minas Gerais -MG, Brazil. Twenty-two (22) LEPA QuadSpray emitter nozzles were evaluated, with nozzle diameter ranging from 1.59 to 9.92 mm. The experimental design used was entirely randomized, with three replications. Increasing values of nozzle flow rate ranging from 77.44 up to 3,044 L h -1 , were obtained with increasing nozzle diameter sizes. Application pattern width ranged from 0.56 up to 3.24m, according to nozzles diameter size. Low values of CDU (maximum of 35.73%) were observed when using the QuadSpray nozzles. Observed average water application rates covered the range between 68.05 mm h -1 (the lowest value that was obtained with the 2.38mm nozzle) and 258.15 mm h -1 (the highest value that was observed with the 9.92 mm). Average water application rates increased in a simple nonlinear function with the increase of nozzle size diameter. However, the weighted average increase in the amount of soil loss by erosion was not related to the increase of weighted average water application values.KEYWORDS: technical characteristics of the Quad-Spray, resizing of nozzles, erosive impact. CARACTERÍSTICAS DE DISTRIBUIÇÃO DE ÁGUA E PERDAS DE SOLO DE BOCAIS DO EMISSOR QUAD-SPRAY TIPO LEPARESUMO: Foi objetivo deste trabalho caracterizar a taxa de aplicação de água, largura do padrão molhado, vazão, uniformidade de distribuição de água e perdas de solo de bocais do emissor QuadSpray tipo Low Energy Precision Aplication (LEPA). O trabalho foi realizado no

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“…In addition, these systems can achieve high efficiencies and uniformities when designed and managed properly. However, the efficiency and uniformity of these systems can be considerably reduced by runoff resulting from high application rates; unfortunately, runoff is inherent with moving sprinkler systems (Kincaid et al, 1969;Thooyamani et al, 1987;Kincaid, 2005;Luz, 2011). Moving systems are designed to apply water over a given point in the field within a set limited amount of time.…”

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confidence: 99%