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Trend analysis of the SEPAC 30 year drainage climatology

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2016 10th International Drainage Symposium Conference, 6-9 September 2016, Minneapolis, Minnesota  .(doi:10.13031/IDS.20162515027)
Authors:   Laura C. Bowling, E. J. Kladivko
Keywords:   Drainage efficiency, subsurface drainage, time series, trend analysis.

Abstract. Discussions regarding the role of agricultural subsurface drainage in observed streamflow trends in recent years are complicated by the fact that the performance of drainage systems themselves may change over time. The 30 year drainage dataset from the Southeast Purdue Agricultural Center in Indiana provides a unique opportunity to analyze changes in the characteristic of drainflow response over time. Following careful checking of the data for consistency over time, several derived time series were analyzed for trends using the seasonal Mann-Kendall test. Statistically significant increasing trends have occurred in event drainage volume, despite no trend in precipitation. Increasing trends in drainage peak flow rates, accompanied by a decreasing trend in lag time are indicative of the development of more efficient soil drainage. Such increases are likely to contribute to an increase in stormflow in receiving surface water systems, and a subsequent reduction in low flow volumes.

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