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Watershed regressions for pesticides (warp) models for predicting atrazine concentrations in Corn Belt streams

Journal of the American Water Resources Association

By:
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DOI: 10.1111/j.1752-1688.2012.00661.x

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Abstract

Watershed Regressions for Pesticides (WARP) models, previously developed for atrazine at the national scale, are improved for application to the United States (U.S.) Corn Belt region by developing region-specific models that include watershed characteristics that are influential in predicting atrazine concentration statistics within the Corn Belt. WARP models for the Corn Belt (WARP-CB) were developed for annual maximum moving-average (14-, 21-, 30-, 60-, and 90-day durations) and annual 95th-percentile atrazine concentrations in streams of the Corn Belt region. The WARP-CB models accounted for 53 to 62% of the variability in the various concentration statistics among the model-development sites. Model predictions were within a factor of 5 of the observed concentration statistic for over 90% of the model-development sites. The WARP-CB residuals and uncertainty are lower than those of the National WARP model for the same sites. Although atrazine-use intensity is the most important explanatory variable in the National WARP models, it is not a significant variable in the WARP-CB models. The WARP-CB models provide improved predictions for Corn Belt streams draining watersheds with atrazine-use intensities of 17 kg/km2 of watershed area or greater.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Watershed regressions for pesticides (warp) models for predicting atrazine concentrations in Corn Belt streams
Series title:
Journal of the American Water Resources Association
DOI:
10.1111/j.1752-1688.2012.00661.x
Volume
48
Issue:
5
Year Published:
2012
Language:
English
Publisher:
Wiley
Publisher location:
Hoboken, NJ
Contributing office(s):
Indiana Water Science Center
Description:
17 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of the American Water Resources Association
First page:
970
Last page:
986
Number of Pages:
17
Country:
United States
Other Geospatial:
Corn Belt