SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Effect of watershed subdivision on SWAT flow, sediment, and nutrient predictions 
Authors:Jha, M., P.W. Gassman, S. Secchi, R. Gu, and J. Arnold 
Journal:Journal of the American Water Resources Association 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic & pollutant 
Primary Application Category:HRU and/or subwatershed delineation effects 
Secondary Application Category:pollutant cycling/loss and transport 
Watershed Description:Four Iowa watersheds (1 or more 8-digit): 1,929, 4,776 (Maquoketa River), 10,829, & 17,941 km^2 
Calibration Summary: 
Validation Summary:1981-90 (Maquoketa River) r2 values: avg. daily = .68 avg. monthly = .76 avg. annual = .65 
General Comments:Variation in subwatershed/HRU configurations had very little effect on SWAT streamflow estimates. However, optimal threshold sizes of 3, 2, & 5% were found for sediment, nitrate, and mineral P, relative to overall watershed sizes across the four watersheds. Further observations are reported for organic N & P, and recommendations are given for criteria on how many subwatersheds to use in a SWAT simulation, depending on what indicators are being estimated with SWAT. 
Keywords:modeling; flow; sediment; nutrients; watershed subdivision; sensitivity analysis