SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Quantifying pathogen sources in streams by hydrograph separation 
Authors:Chin, D.A. 
Journal:Journal of Environmental Engineering 
Volume (Issue):137(9) 
Article ID: 
URL (non-DOI journals): 
Broad Application Category:hydrologic and pollutant 
Primary Application Category:model and/or data comparison 
Secondary Application Category:pathogen fate and transport 
Watershed Description:Subwatershed K of the Little River Experimental watershed in south central Georgia, U.S. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:A new technique for quantifying pathogen sources to streams is proposed and demonstrated. Hydrograph separation is used to partition measured streamflow into surface runoff and base flow, and characteristic pathogen concentrations are assigned to each flow component along with a background source flux. The maximum-likelihood characteristic concentrations and background flux are determined from measured instream pathogen concentrations. This approach is shown to yield comparable to superior performance in predicting instream pathogen concentrations compared to much more complex terrestrial fate and transport models. Application of the proposed approach to six catchments yields Nash Sutcliffe efficiencies of the log-transformed fecal-coliform concentrations in the range of 0.21 to 0.48. The characteristic fecal-coliform concentrations in surface runoff are in the range of 200 - 700 cfu/dL and the base flow characteristic concentrations are in the range of 20 - 100 cfu/dL. It is shown that the frequency distribution of bacteria concentrations derived from sample measurements can sometimes differ significantly from their long-term frequency distribution. 
Keywords:Bacteria; Fate and Transport; Fecal Coliforms; HSPF; Model; SWAT; TMDL; Watershed