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

Citation:  Watershed Management to Meet Water Quality Standards and Emerging TMDL (Total Maximum Daily Load) Proceedings of the Third Conference 5-9 March 2005 (Atlanta, Georgia USA) Publication Date 5 March 2005  701P0105.(doi:10.13031/2013.18039)
Authors:   Philip L. Barnes
Keywords:   Bacteria, Monitoring, Water Quality, Watershed

The State of Kansas has implemented a high priority bacterial TMDL on Fall River watershed near Eureka, Kansas. This watershed is represented by the HUC 11 code 11070102010 and drains 865.6 km2 of Flint hills rangeland. The designated uses of water in this watershed include aquatic life support, primary contact recreation, domestic water supply, food procurement and livestock watering. Since loading capacity varies as a function of the flow present in the stream, this TMDL represents a continuum of desired loads over all flow conditions, rather than fixed at a single value. Sample data for the sampling site were categorized for each of the three defined seasons: Spring (Apr-Jul), Summer-Fall (Aug-Oct) and Winter (Nov-Mar). High flows and runoff equate to lower flow durations; baseflow and point source influences generally occur in the 75-99% range. A load curve was established for the Secondary Contact Recreation criterion by multiplying the flow values along the curve by the applicable water quality criterion and converting the units to derive a load duration curve of colonies of bacteria per day. This load curves represent the TMDL since any point along the curve represents water quality for the standard at that flow. Historic excursions from the water quality standard are seen as plotted points above the load curve. Water quality standards are met for those points plotting below the load duration curve. This paper will describe monitoring activities during 2003-04 initiated to locate the source of the bacteria in the stream and management practices used in the watershed to meet this TMDL.

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