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National, Holistic, Watershed-Scale Approach to Understand the Sources, Transport, and Fate of Agricultural Chemicals

^a U.S. Geological Survey, 122 Civil Engineering Building, 500 Pillsbury Drive, SE, Minneapolis, MN 55455
^b U.S. Geological Survey, 2130 SW 5th Avenue, Portland, OR 97201
^c U.S. Geological Survey, 934 Broadway, Suite 300, Tacoma, WA 98402

View larger version (20K): [in this window] [in a new window]   Fig. 1. Conceptual model of the environmental compartments and inter-compartmental pathways relevant to water and chemical transport.

View larger version (61K): [in this window] [in a new window]   Fig. 2. Study design applied to the Washington location. The Yakima River, Granger Drain, and DR2 are the nested watersheds at three scales. The red circles show the location of each well nest. Those designated as "FS" are part of the flow system study. This flow system terminates at the GW/SW interaction study area near the DR2 surface-water gage. The wells designated as "AS" are part of the well network to characterize the local ground water. The unsaturated zone study area includes lysimeters and soil moisture instruments at various depths, a weather station, and a water-table well. There were no tile drain or rain sampling components to this study, since neither of these are important factors in this environment.

View larger version (34K): [in this window] [in a new window]   Fig. 3. Study area locations.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Annual hydrology of the outlets of the five focus subbasins.