| 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. |
| Genre: | Article |
| ProdID: | 70040508 |
| Citation Author: | Stone, Wesley W.; Gilliom, Robert J. |
| Citation Contributing Office: | Indiana Water Science Center |
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| Citation End Page: | 986 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of the American Water Resources Association |
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| Citation Month: | OCT |
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| Citation Number Of Pages: | 17 |
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| Citation Phsyical Description: | 17 p. |
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| Citation Publisher: | Wiley |
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| Citation Search Results Text: | Watershed regressions for pesticides (warp) models for predicting atrazine concentrations in Corn Belt streams; 2012; Article; Journal; Journal of the American Water Resources Association; Stone, Wesley W.; Gilliom, Robert J. |
| Citation Start Page: | 970 |
| Citation Volume: | 48 |
| Citation Year: | 2012 |
| Type: | citation/reference |
| Text: | Watershed regressions for pesticides (warp) models for predicting atrazine concentrations in Corn Belt streams; 2012; Article; Journal; Journal of the American Water Resources Association; Stone, Wesley W.; Gilliom, Robert J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1111/j.1752-1688.2012.00661.x |
| Date Other: | Mon, 29 Oct 2012 00:00 -0500 |
| Publisher: | Wiley |
