Infiltration Variability in Furrow Irrigation
Publication: Journal of Irrigation and Drainage Engineering
Volume 128, Issue 1
Abstract
In this paper, the contribution of different sources of variability to irrigation water depth variability was quantified using a combination of variance techniques. This method was applied using field measurements from irrigation events performed on a loamy soil with a low-infiltration rate. Infiltration variability was estimated with blocked furrow infiltrometers. The assumptions made for the application of the combination of variance techniques proved to be valid. The major variability source turned out to be the soil intake characteristics, whose variance accounted for 45–71% of the variance in infiltrated depth under first irrigation conditions. Opportunity time and wetted perimeter were less variable in subsequent irrigations and the soil intake characteristics variability accounted for a percentage of total variance beyond 76%, being at times beyond 95%. The combination of variance techniques can be used to complement standard evaluation methods in order to take into account the influence of different variability sources.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 128 • Issue 1 • February 2002
Pages: 26 - 33
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Aug 11, 2000
Accepted: Apr 10, 2001
Published online: Feb 1, 2002
Published in print: Feb 2002
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