Erratum for “Field-Scale Sprinkler Irrigation System Hydraulic Model. II: Hydraulic Simulation” by D. Zerihun and C. A. Sanchez
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VIEW THE CORRECTED ARTICLEPublication: Journal of Irrigation and Drainage Engineering
Volume 140, Issue 10
Please note a few corrections to the text and tables of this article.
In the first sentence of the Introduction, the reference citation should be Zerihun et al. (2014).
Eq. (7) and the text preceding it should be revised as follows:
Substituting Eqs. (4)–(6), into Eqs. (1) and (3) results in two equations with three unknowns, which can be combined into a nonlinear equation with two unknowns,
(7)
In Eq. (15), the notation should be replaced with the lower case Greek letter
(15)
In Table 1, the dimension, , should be changed to
Type of input data | Unit | Model evaluation | Data used in simulation examples | |
---|---|---|---|---|
Single-line laterals | Double-line laterals | |||
Sprinkler spacinga | m | 9.14 | 9.14 | 9.14 |
Coefficient of sprinkler function, b | 0.0258 | 0.0125 | 0.0125 | |
Exponent of sprinkler function, b | — | 0.502 | 0.521 | 0.521 |
Lateral spacingc | m | 12.19 | 10.67 | 10.67 |
Lateral length | m | 192.0 | 374.8 | 374.8 |
Lateral diameterd | mm | 76.2 | 76.2 | — |
Slope along lateralse | — | — | ||
Mainline length | m | 64.0 | 149.4 | 160.0 |
Mainline diameter | mm | 152.4 | 203.2 | 203.2 |
Mainline slope | — | 0.0 | 0.0 | |
Total dynamic head (mainline inlet)f | m | 158.0 | 158.0 | |
Absolute roughness of pipe, for Darcy-Weisbach equation (aluminum pipe) () | mm | 0.127 | 0.127 | 0.127 |
Local head loss coefficient at lateral and riser pipe coupling | ||||
Branch flow | — | 1.3 | 1.3 | 1.3 |
Line flow | — | 0.7 | 0.7 | 0.7 |
Local head loss coefficient at mainline and lateral coupling | ||||
Branch flow | — | 1.0 | 1.0 | 1.0 |
Line flow | — | 0.5 | 0.5 | 0.5 |
a
The first sprinkler is located at full spacing from the lateral inlet.
b
Coefficient and exponent of sprinkler pressure head-discharge function.
c
Considering the data used for model evaluation, the first lateral is installed at a distance of 3.05 m from the pump.
d
Lateral diameter used in the simulation example with a double-line lateral layout configuration vary along the laterals (between 0 and 128.0 m is 76.2 mm, between 128.0 and 228.5 m is 63.5 mm, and between 228.5 and 374.8 m is 50.8 mm).
e
Lateral slope used for system simulation with a single-line lateral layout configuration vary along the laterals (between 0 and 128.0 m is , between 128.0 and 256.0 m is 0.0%, and between 256.0 and 374.8 m is 0.5%).
f
Considering the data used for model evaluation, the total dynamic head imposed at the system inlet for data set I is 139.0 m; and for data sets II and III, it is 144.0 m.
Data sets | Error, nodal pressure head | |||
---|---|---|---|---|
Minimum (%) | Maximum (%) | Average (%) | Overall average (%) | |
I | 0.5 | 3.2 | 1.3 | 2.0 |
II | 0.6 | 11.6 | 3.1 | |
III | 0.3 | 2.7 | 1.6 |
Note: Average = arithmetic average of the errors computed for each measurement station along the main; ; overall average = the error averaged over all the data sets.
The dashed lines representing simulated hydraulic grade lines are not clearly visible in Fig. 5. The image below illustrates these data points more clearly.
In the section “Single-Line Laterals”, the concluding sentence of the paragraph describing Fig. 6(a) should read, “This behavior of the pressure head is caused by the interactive effects of the field topographic configuration considered here and the decrease in discharge along the laterals.”
In the section “Double-Line Laterals”, the concluding sentence of the paragraph describing Fig. 6(c) should read, “This pattern of pressure head variation is caused by the interactive effects of the lateral diameter configuration considered here and the decrease in discharge along the laterals.”
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© 2014 American Society of Civil Engineers.
History
Received: Jun 12, 2014
Accepted: Jun 16, 2014
Published online: Aug 20, 2014
Published in print: Oct 1, 2014
Discussion open until: Jan 20, 2015
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