SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Development of a hydrologic connectivity dataset for SWAT assessments in the US 
Authors:White, M.J., K. Beiger, M. Gambone, E. Haney, J. Arnold and J. Gao 
Volume (Issue):
Article ID:892 
URL (non-DOI journals): 
Broad Application Category:data or component development 
Primary Application Category:data and/or component contribution to SWAT or SWAT+ 
Secondary Application Category:Conservation Effects Assessment Project (CEAP) based study 
Watershed Description:Conterminous U.S. 
Calibration Summary: 
Validation Summary: 
General Comments:This hydrologic connectivity data developed in this study is intended for use in SWAT and SWAT+. 
Abstract:Model-based water quality assessments are an important informer of conservation and environmental policy in the U.S. The recently completed national scale Conservation Effects Assessment Project (CEAP) is being replicated using an improved model populated with new and higher resolution data. National assessments are particularly difficult as models must operate with both a very large spatial extent (the contiguous U.S.) while maintaining a level of granularity required to capture important small scale processes. In this research, we developed datasets to describe the hydrologic connectivity at the U.S. Geological Survey (USGS) 12-digit Hydrologic Unit Code (HUC-12) level. Connectivity between 86,000 HUC-12s as provided by the Watershed Boundary Dataset (WBD) was evaluated and corrected. We also detailed a method to resolve the highly detailed National Hydrography Dataset (NHD) stream segments within each HUC-12 into vastly simplified representative channel schemes suitable for use in the recently developed Soil and Water Assessment Tool + (SWAT+) model. This representative channel approach strikes a balance between computational complexity and accurate representation of the hydrologic system. These data will be tested in the upcoming CEAP II national assessment. Until then, all the WBD corrections and NHDPlus representative channel data are provided via the web for other researchers to evaluate and utilize. 
Keywords:SWAT+; CEAP; connectivity; hydrology; tributary; channel