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Diuron in Surface Runoff and Tile Drainage from Two Grass-Seed Fields

^a Department of Bioengineering, Oregon State University, Corvallis, OR 97331
^b Department of Horticulture, Oregon State University, Corvallis, OR 97331
^c present address: Camp, Dresser & McKee, 11811 NE 1st Street, Suite 201, Bellevue, WA 98005.

View larger version (35K): [in a new window]   Fig. 1. Map of Field 1 with inset showing the location of the Willamette Basin, OR. Fields 1-W and 1-E are separated by a low berm running north–south to just south of the diversion pipe inlet. Sheet metal walls inserted 5 cm into the soil extend southwestward from the inlet of the diversion pipe to divert surface flow into the pipe. The heavy solid line bounds the surface area in Field 1-W monitored above the diversion pipe inlet. The gray rectangles show the approximate areas monitored by the flow meters inserted in the tile drain systems in Fields 1-W and 1-E.

View larger version (40K): [in a new window]   Fig. 2. Map of Field 2. A low berm on the west side of the field directs runoff toward the flumes. A ditch separates the field from the road to the east. The heavy solid line bounds the surface area monitored above the flumes.

View larger version (29K): [in a new window]   Fig. 3. Field 1 (a) rainfall and surface runoff intensity and (b) diuron concentrations in surface runoff and tile drainage for the 2001–2002 wet season. Diuron was applied on 15 Sept. 2001. Runoff monitoring began on 6 Nov. 2001 (dashed vertical line) and was stopped in June 2002. The detection limit is 0.02 µg L–1.

View larger version (26K): [in a new window]   Fig. 4. Field 2 (a) rainfall and surface runoff intensity and (b) diuron concentrations in surface runoff and tile drainage for the 2002–2003 wet season. Diuron was applied on 18 Oct. 2002. The dashed vertical lines in (a) bound the period of surface runoff monitoring. The detection limit is 0.02 µg L–1.

View larger version (18K): [in a new window]   Fig. 5. Diuron concentration (Cl) in surface runoff against dimensionless time (t*) and dimensionless cumulative rainfall (R*) for Field 1-W.

View larger version (18K): [in a new window]   Fig. 6. Diuron concentration (Cl) in surface runoff against dimensionless time (t*) and dimensionless cumulative rainfall (R*) for Field 2-S.

View larger version (18K): [in a new window]   Fig. 7. Diuron concentration (Cl) in tile drainage against dimensionless time (t*) and dimensionless cumulative rainfall (R*) for Field 2-N.