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Effect of Rainfall Simulator and Plot Scale on Overland Flow and Phosphorus Transport

USDA Agricultural Research Service, Pasture Systems and Watershed Management Research Unit, University Park, PA 16802-3702

View larger version (17K): [in a new window]   Fig. 1. Location of the study area within the Mahantango Creek watershed in relation to the Susquehanna River and Chesapeake Bay watershed.

View larger version (140K): [in a new window]   Fig. 2. Simultaneous National Phosphorus Research Project (NPRP) and Water Erosion Potential Predictor (WEPP) rainfall simulations on the no-till Berks soil.

View larger version (29K): [in a new window]   Fig. 3. Plot layout for Water Erosion Potential Predictor (WEPP) rainfall simulations.

View larger version (15K): [in a new window]   Fig. 4. Unit width hydrographs for National Phosphorus Research Project (NPRP) and Water Erosion Potential Predictor (WEPP) simulators for the first day of rainfall on the no-till Watson soil. Hydrographs are normalized on a 1-m-width basis for comparison. Bars represent standard errors of the mean values.

View larger version (24K): [in a new window]   Fig. 5. Relationship between P enrichment ratio and sediment discharge of overland flow generated by the National Phosphorus Research Project (NPRP) and Water Erosion Potential Predictor (WEPP) rainfall simulators for grassed and tilled Berks and no-till Watson soils.

View larger version (28K): [in a new window]   Fig. 6. Relationship between the dissolved reactive P concentration of overland flow generated by the National Phosphorus Research Project (NPRP) and Water Erosion Potential Predictor (WEPP) rainfall simulators for grassed and tilled Berks and no-till Watson soils.