Roughness Coefficient of Micro-irrigation Laterals

Mohd Soom, Mohd Amin (1994) Roughness Coefficient of Micro-irrigation Laterals. Pertanika Journal of Science & Technology, 2 (1). pp. 93-105. ISSN 0128-7680

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Abstract

A micro-irrigation system' must apply water and fertilizer uniformly over the entire field. However friction loss in pipes and fittings, and differences in elevation cause water pressure to vary. Discharge variations due to pressure differences and manufacturing variations cause non-uniformity of irrigation. To assure maximum economy, the hydraulic design of the system must be adequately evaluated for the required level of uniformity. This paper presents results of laboratory tests for head loss in smooth polyethylene pipe fitted with insert emitters. The Hazen-Williams roughness coefficients are included in the friction factor-Reynolds number diagrams so that system designers may choose a more accurate friction coefficient to improve energy, water and material use efficiency of a micro-irrigation system.

Item Type:Article
Keyword:micro/trickle/drip irrigation, pipe flow hydraulics, lateral design, friction factor, roughness coefficient, head loss, emitter barb protrusion
Faculty or Institute:Faculty of Engineering
Publisher:Universiti Putra Malaysia Press
ID Code:3154
Deposited By: Nur Izzati Mohd Zaki
Deposited On:24 Nov 2009 03:38
Last Modified:27 May 2013 07:06

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