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Correction factors for center-pivots with end-guns

Correction factors for center-pivots with end-guns
Correction factors for center-pivots with end-guns
The end-gun discharge of center pivots is expressed as a ratio of the discharge at the pivot. Using this ratio, equations are developed for the friction correction factor and pressure distribution factor. If end-gun discharge is reduced to zero, then these equations reduce to the well-established equation for the friction correction factor and pressure distribution factor. For an end-gun ratio of unity, the friction correction factor also becomes unity, reflecting that the lateral is in fact a pipeline without outlets. The pressure distribution factor becomes linear, reflecting that head loss varies linearly with length. For a lateral of constant diameter and typical end- gun discharge there is a significant increase in head loss due to friction. However, there is insignificant difference in the estimate using either this technique or the effective radius technique. The pressure distribution factor is slightly higher, indicating that in laterals with end guns the pressure head toward the center of the lateral is higher. The equations presented can be used to design center-pivot laterals with end guns or the first segment of a tapered center pivot lateral.
0733-9437
113-118
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31
Anwar, Arif A.
e9a57bb7-5225-45e6-9a69-2396a6e4fd31

Anwar, Arif A. (2000) Correction factors for center-pivots with end-guns. Journal of Irrigation and Drainage Engineering, ASCE, 126 (2), 113-118. (doi:10.1061/(ASCE)0733-9437(2000)126:2(113)).

Record type: Article

Abstract

The end-gun discharge of center pivots is expressed as a ratio of the discharge at the pivot. Using this ratio, equations are developed for the friction correction factor and pressure distribution factor. If end-gun discharge is reduced to zero, then these equations reduce to the well-established equation for the friction correction factor and pressure distribution factor. For an end-gun ratio of unity, the friction correction factor also becomes unity, reflecting that the lateral is in fact a pipeline without outlets. The pressure distribution factor becomes linear, reflecting that head loss varies linearly with length. For a lateral of constant diameter and typical end- gun discharge there is a significant increase in head loss due to friction. However, there is insignificant difference in the estimate using either this technique or the effective radius technique. The pressure distribution factor is slightly higher, indicating that in laterals with end guns the pressure head toward the center of the lateral is higher. The equations presented can be used to design center-pivot laterals with end guns or the first segment of a tapered center pivot lateral.

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More information

Published date: March 2000

Identifiers

Local EPrints ID: 74693
URI: https://eprints.soton.ac.uk/id/eprint/74693
ISSN: 0733-9437
PURE UUID: 442510c0-64e5-4b2c-a08d-f0efa7506655
ORCID for Arif A. Anwar: ORCID iD orcid.org/0000-0002-3071-3197

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Date deposited: 11 Mar 2010
Last modified: 06 Jun 2018 13:01

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