This report describes TP mass-balance modeling results for three synoptic sampling periods in the lower Boise River between Veterans Memorial Parkway (RM 50.2) and Parma (RM 3.8). Input data collected for mass-balance models provided additional information regarding groundwater and surface-water interaction in the modeling reach. Site reconnaissance and analysis of related data were completed to finalize sampling sites within the modeling reach. Site.selection methods are described in detail to document reasons for selecting specific sites and to provide an understanding of the modeling reach. A detailed analysis of model results enabled further evaluation of sources of phosphorus in the lower Boise River during three distinct periods in a given water year (the 12-month period starting October 1 for any given year through September 30 of the following year): (1) during irrigation season, (2) just after irrigation season ends, and (3) just before irrigation season begins. With sources of phosphorus described in context of model results, model sensitivity to changes in these sources was also evaluated.
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