Yields Table

Yields are provided individually for each parameter and station in a simple table format. 
Not all constituents are available for all sites.

Key to column headings:
PCODE = Parameter code:
P00600 = Total nitrogen (as N)
P00631 = Nitrate (as N)
P00665 = Total phosphorus (as P)
P00671 = Orthophosphorus (as P)
P80154 = Suspended sediment
START_YEAR = First water year of averaging period
END_YEAR = Last water year of averaging period
MEAN_YIELD = mean yield for averaging period in pounds per acre
NYEARS = Length of period over which average yield is computed in years
Nutrient and suspended concentrations and loads and flow-normalized concentrations and loads were estimated using a weighted regression approach called Weighted Regressions on Time, Discharge, and Season (WRTDS) (Hirsch and others, 2010), which is included in the R (version 3.4.0) software package called EGRET - Exploration and Graphics for RivEr Trends (version 2.6.0) (Hirsch and DeCicco, 2015). The application of WRTDS to generate the results provided in this table is documented in Chanat and others, 2016

References Cited:

Hirsch, R.M., Moyer, D.L., and Archfield, S.A., 2010, Weighted regressions on time, discharge, and season (WRTDS), with an application to Chesapeake Bay river inputs: Journal of the American Water Resources Association, v. 46, no. 5, p. 857-880

Hirsch, R.M. and De Cicco, Laura, 2015, User guide to Exploration and Graphics for RivEr Trends (EGRET) and dataRetrieval: R packages for hydrologic data (version 2.0, February 2015): U.S. Geological Survey Techniques and Methods book 4, chap. A10, 93 p., http://dx.doi.org/10.3133/tm4A10. (accessed May 24, 2016)

Chanat, J.G., Moyer, D.L., Blomquist, J.D., Hyer, K.E., and Langland, M.J., 2016, Application of a weighted regression model for reporting nutrient and sediment concentrations, fluxes, and trends in concentration and flux for the Chesapeake Bay Nontidal Water-Quality Monitoring Network, results through water year 2012: U.S. Geological Survey Scientific Investigations Report 2015-5133, 139 p. http://dx.doi.org/10.3133/sir20155133.

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Columns default to ascending sort order going from left to right. To change the sort order, click the column name of the first column to sort, and then Ctrl-click each subsequent column to sort. Columns can be sorted ascending, descending, or not at all.