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Update of Watershed Regressions for Pesticides (WARP) for Predicting Atrazine Concentration in Streams

机译:更新农药流域回归(WaRp)预测河流中阿特拉津浓度

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This report describes updated WARP models for predicting atrazine concentration in streams. Improvements over previous work (Larson and others, 2004; Stone and others, 2008) include the incorporation of annual atrazine-use estimates on crops and the addition of annual precipitation data as potential explanatory variables. The WARP models are based on the most complete year of observations for each of the 112 sampling sites. The updated WARP models predict atrazine concentrations for selected percentiles of the annual frequency distribution (5th, 10th, 15th, 25th, 50th, 75th, 85th, 90th, and 95th), as well as the annual mean, annual maximum, and annual maximum moving averages (21-, 60-, and 90-day durations).

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