Statistical Techniques for Assessing Water‐Quality Effects of BMPs
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 2
Abstract
Little has been published on the effectiveness of various management practices in small rural lakes and streams at the watershed scale. In this study, statistical techniques were used to test for changes in water‐quality data from watersheds where best management practices (BMPs) were implemented. Reductions in data variability due to climate and seasonality were accomplished through the use of regression methods. This study discusses the merits of using storm‐mass‐transport data as a means of improving the ability to detect BMP effects on stream‐water quality. Statistical techniques were applied to suspended‐sediment records from three rural watersheds in Illinois for the period 1981–84. None of the techniques identified changes in suspended sediment, primarily because of the small degree of BMP implementation and because of potential errors introduced through the estimation of storm‐mass transport. A Monte Carlo sensitivity analysis was used to determine the level of discrete change that could be detected for each watershed. In all cases, the use of regressions improved the ability to detect trends.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 2 • March 1994
Pages: 334 - 347
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Dec 22, 1992
Published online: Mar 1, 1994
Published in print: Mar 1994
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