Analysis of Fecal Coliform Data from Onondaga Lake Tributaries

Jul 17, 2013

Prepared for Upstate Freshwater Institute and Onondaga County Department of Water Environment Protection by William W. Walker, Jr., Ph.D. and Jeffrey D. Walker, M.Eng.

Summary: This report describes exploratory and statistical analyses of fecal coliform data collected by the Onondaga County Department of Water Environment Protection (OCDWEP) at six monitoring sites on four major tributaries to Onondaga Lake between 1999 and 2012. Exploratory analyses of bacteria correlations with season, precipitation, and flow were performed to provide a basis for future development of a statistical framework for stormwater sampling. Prototype models for detecting wet weather trends were developed by separating dry weather and wet weather samples based upon antecedent precipitation, and then developing separate statistical models for dry weather and wet weather conditions. Trend analyses were performed on fecal coliform data based on three separate methods (linear regression, Mann-Kendall, Seasonal Kendall) using the R statistical programming language and wq package.

Citation: Walker, W.W. and J.D. Walker. 2013. Analysis of Fecal Coliform Data from Onondaga Lake Tributaries. Prepared for Upstate Freshwater Institute and Onondaga County Department of Water Environment Protection by William W. Walker, Jr., Ph.D. and Jeffrey D. Walker, M.Eng. July 2013.

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