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The modified SWAT model for predicting fecal coliforms in the Wachusett Reservoir Watershed, USA

TitleThe modified SWAT model for predicting fecal coliforms in the Wachusett Reservoir Watershed, USA
Publication TypeJournal Article
Year of Publication2012
AuthorsCho KHwa, Pachepsky Y.A., Kim JHa, Kim J-W, Park M-H
JournalWater Research
Volume46
Issue15
Start Page4750
Pagination4750-4760
Date Published10/2012
KeywordsFecal coliform, Solar intensity, SWAT model, Wildlife
Abstract

This study assessed fecal coliform contamination in the Wachusett Reservoir Watershed in Massachusetts, USA using Soil and Water Assessment Tool (SWAT) because bacteria are one of the major water quality parameters of concern. The bacteria subroutine in SWAT, considering in-stream bacteria die-off only, was modified in this study to include solar radiation-associated die-off and the contribution of wildlife. The result of sensitivity analysis demonstrates that solar radiation is one of the most significant fate factors of fecal coliform. A water temperature-associated function to represent the contribution of beaver activity in the watershed to fecal contamination improved prediction accuracy. The modified SWAT model provides an improved estimate of bacteria from the watershed. Our approach will be useful for simulating bacterial concentrations to provide predictive and reliable information of fecal contamination thus facilitating the implementation of effective watershed management.

DOI10.1016/j.watres.2012.05.057