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Comparison of HSPF simulated in-stream bacteria concentration using FTABLES generated with field survey and digital data

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

Citation:  Watershed ManWatershed Management to Meet Water Quality Standards and TMDLS (Total Maximum Daily Load) Proceedings of the 10-14 March 2007, San Antonio, Texas  701P0207.(doi:10.13031/2013.22428)
Authors:   Kyle M Hall, Rebecca W Zeckoski, Kevin M Brannan, Brian L Benham
Keywords:   simulation; watershed management; nonpoint source pollution; time series analysis; HSPF

The Hydrological Simulation Program-FORTRAN (HSPF) represents discharge using function tables (FTABLES) that relate stream stage, surface area, volume, and discharge. In this study, five FTABLE scenarios were compared to assess their effect on various outputs predicted using HSPF. Four field-based FTABLE scenarios were developed using detailed cross-sectional surveys. A fifth digital-based FTABLE scenario was developed using digital elevation data and Natural Resources Conservation Service Regional Hydraulic Geometry Curves. Pair-wise Students t-tests were used to compare long-term average instream fecal bacteria concentration and instream fecal bacteria die-off. The digital-based FTABLE scenarios produced significantly higher long-term average instream fecal bacteria concentrations and significantly lower instream fecal bacteria die-off. These differences are function of FTABLE generation method and are an artifact of differences in the digital- and field-based volume-discharge relationships that HSPF uses to compute hourly discharge rates.

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