TOTAL PHOSPHORUS MODEL RESULTS

The New England SPARROW model for total phosphorus has an R-squared value of 0.94, with mean square error of 0.23. Variables that are statistically significant in the total-phosphorus model include discharges from municipal wastewater-treatment and pulp and paper facilities, and developed, agricultural, and forested areas. For total phosphorus, in-stream loss rates are significant for reservoirs with surface areas of 10 square kilometers or less, and in streams with flows less than or equal to 2.83 cubic meters per second (100 cubic feet per second) with a half-life of about 1.5 days.

The model form is found on page 3, equation 1, of the report. The total phosphorus model coefficients are listed on page 17, table 4, of the report. (USGS SIR2004-5012)

About New England SPARROW