Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Fecal Bacteria Source Characterization and Sensitivity Analysis of SWAT 2005

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072273.(doi:10.13031/2013.23378)
Authors:   Prem B Parajuli, Kyle R Mankin, Philip L Barnes, Colleen H Green
Keywords:   Sensitivity analysis, fecal coliform bacteria, rainfall, runoff, SWAT, watershed

The sensitivity of the Soil and Water Assessment Tool (2005) and its input parameters that impact the prediction of fecal bacteria concentrations were evaluated. The model was applied at Rock Creek watershed (77 km2), Kansas. Fecal bacteria sources were characterized to use commonly available data to describe model inputs of watershed sources of livestock, septic and wildlife loads. The flow and bacteria loads were validated reasonably for the watershed. The runoff events of the simulated period geometric mean value of the fecal coliform bacteria concentration were evaluated using a relative sensitivity index (S). The four model parameters and one input parameter were tested using Latin Hypercube Sampling (LHS) and independent parameter perturbation (IPP) methods. The model parameters showed no to very high sensitivity (S up to 8.69) and an input parameter determined no to moderate sensitivity (S up to 1.05). If the model is to be used to predict fecal coliform bacteria concentration, particular attention should be taken in characterizing sources and selection of input parameter values.

(Download PDF)    (Export to EndNotes)