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Preferential Flow Estimates to an Agricultural Tile Drain with Implications for Glyphosate Transport

U.S. Geological Survey, Indiana Water Science Center, 5957 Lakeside Blvd., Indianapolis, IN 46278

View larger version (26K): [in a new window]   Fig. 1. Leary Weber Ditch study site in Hancock County, Indiana.

View larger version (13K): [in a new window]   Fig. 2. Chloride concentration and specific conductance in tile drain effluent for the May 2004 storms at the Leary Weber Ditch tile drain study site. Regression equation subsequently used to estimate chloride concentrations of tile drain effluent in 15-min intervals through the storm hydrographs.

View larger version (13K): [in a new window]   Fig. 3. April through December 2004 hourly rainfall and tile drain flow.

View larger version (21K): [in a new window]   Fig. 4. (A) Hourly rainfall for the 19 May storm; (B) separated tile drain flow hydrograph, water table levels, and glyphosate concentrations for the storm; (C) closer look at the separated tile drain flow hydrograph at the time of increased flow. Tile drain flow hydrograph is separated into preferential and matrix flows by use of a simple chloride mixing analysis.

View larger version (23K): [in a new window]   Fig. 5. (A) Hourly rainfall for the 30 May storm; (B) separated tile drain flow hydrograph, water table levels, and glyphosate concentrations for the storm; (C) closer look at the separated tile drain flow hydrograph at the time of increased flow. Tile drain flow hydrograph is separated into preferential and matrix flows by use of a simple chloride mixing analysis.

View larger version (8K): [in a new window]   Fig. 6. Glyphosate concentration and preferential flow in the tile drain during the May 2004 storms at the Leary Weber Ditch tile drain study site.

View larger version (13K): [in a new window]   Fig. 7. Glyphosate concentration and preferential flow as a percentage of total tile drain flow during the May 2004 storms at the Leary Weber Ditch tile drain study site.

View larger version (21K): [in a new window]   Fig. 8. (A) Hourly rainfall for the November 2004 storm and (B) tile drain flow hydrograph and water table levels at the Leary Weber Ditch tile drain study site.