Abstract
The following description is the calculation of daily phosphorus loads using the non-parametric smearing method, see references below. 15 minute interval stages were converted to discharge values using the rating curve equation developed by T. LaCroix. (1) Daily loads were calculated by multiplying measured total phosphorus (TP) concentrations by the corresponding discharge values (both occurring at 15:00). (2) The natural log of daily TP loads was then plotted as a function of the natural log of discharge and a linear relationship was determined. (2) A bias-correction factor was estimated as the mean of the residuals. (2) To estimate daily TP loading, the linear model and corresponding bias-correction factor was applied to the continuous discharge data for each site in the log transformed form. (3) The daily TP loading estimates were summed to estimate annual loads. The data file named "Smearing Method MW_TP.csv" is the main Fernan Creek inflow station record. The data file "Smearing Method NS_TP.csv" is the Stacel Creek station record. The file "Smearing Method OF_TP.csv" is the outflow dam station record. Each data file has a separate "readme" file to explain each data column fully. These are named "Readme MW_TP.txt", "Readme NS_TP.txt" and "Readme OF_TP.txt" and correspond to the three data files listed above. References: Colin TA. 1995. Recent advances in statistical methods for the estimation of sediment and nutrient transport in rivers. Review of Geophysics 33: 1117. Duan N. 1983. Smearing estimate: a nonparametric retransformation method. Journal of American Statistical Association 78: 605 610. Helsel DR, Hirsch R. 2002. Statistical methods in water resources techniques of water resources investigations, Book 4, chapter A3. Geological Survey.