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Runoff and Pesticide Discharge from Agricultural Watersheds in NE Indiana

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

Citation:  Paper number  032006,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14936) @2003
Authors:   Dennis C. Flanagan, Stanley J. Livingston, Chi-hua Huang, Elizabeth A. Warnemuende
Keywords:   Water quality, watershed, monitoring, runoff, pesticides, herbicides

This paper presents results of monitoring levels of runoff and pesticides from initial sampling of agricultural watersheds in northeastern Indiana. In 2002, four watersheds were monitored in which land-use is predominately row-crop agriculture of corn and soybeans, and they ranged in size from 480 to 10600 acres. Sampling equipment was installed in early spring and was operational at all sites by June 1. Measurements in 2002 were to establish base flow and pollutant levels. Future plans by local personnel are to implement large numbers of BMPs (Best Management Practices) to control herbicide loss on one of the sets of watersheds, then monitor both control and BMP runoff and water quality. We will ultimately observe and monitor 9 watersheds: control large (3500 acres), control medium (770 acres), control small (7 acres), BMP extra large (10600 acres), BMP large (4800 acres), BMP medium (740 acres), BMP small (6 acres), control-2 large (3400 acres), and control-2 medium (920 acres). All medium and larger watershed sampling sites have been actively monitoring base flow and storm events since May 2003. The BMP and control small watersheds have been located and will be instrumented in summer 2003. For the period June October 2002, measured runoff events ranged from 1 to 4 at the initial four sites. The extra large watershed had the largest number of sampled events (4), and sampled events decreased with decreasing watershed size. Over all sites and events, peak atrazine herbicide concentration measured in runoff water was 66 ppb.

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