![]() However, the opposite result was found for sediment, nitrate, and inorganic P the optimal threshold subwatershed sizes, relative to the total drainage area for each watershed, required to adequately predict these three indicators were found to be around 3, 2, and 5 percent, respectively. The results of the analysis indicated that variation in the total number of subwatersheds had very little effect on streamflow. The objective of this study was to determine the appropriate level of subwatershed division for simulating flow, sediment, and nutrients over 30 years for four Iowa watersheds ranging in size from 2,000 to 18,000 km2 with the Soil and Water Assessment Tool (SWAT) model. Secchi, Silvia Gu, Roy Arnold, JeffĪBSTRACT: The size, scale, and number of subwatersheds can affect a watershed modeling process and subsequent results. ![]() EFFECT OF WATERSHED SUBDIVISION ON SWAT FLOW, SEDIMENT, AND NUTRIENT PREDICTIONS EFFECT OF WATERSHED SUBDIVISION ON SWAT FLOW, SEDIMENT, AND NUTRIENT PREDICTIONS
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