||Nutrients and Suspended Sediment Transported in the Susquehanna River Basin, 2003, and Trends, January 1985 through December 2003.
McGonigal, K. H. ;
||Pennsylvania Dept. of Environmental Protection, Harrisburg.;Environmental Protection Agency, Washington, DC.
Water resources ;
Susquehanna River ;
Hydrologic data ;
Water quality ;
Conestoga River ;
Juniata River ;
Chesapeake Bay watershed ;
Chesapeake Bay program
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||Nutrient and suspended-sediment (SS) samples were collected under base flow and stormflow conditions during calendar year 2003. The samples were collected from the Susquehanna River at Towanda, Danville, and Marietta; the West Branch Susquehanna River at Lewisburg; the Juniata River at Newport; and the Conestoga River at Conestoga, Pennsylvania, and analyzed for nitrogen and phosphorus species and SS. Precipitation for 2003 was above average for all sites. Highest departures from the long-term averages were recorded at Conestoga with 14.68 inches above the long-term mean (LTM) leading to the highest flow at 176.2 percent of the LTM. Lowest departure from the mean was at Danville for rainfall, 1.54 above LTM, and at Lewisburg for flow at 147.3 percent of the LTM. No trends were found for flow. This report utilizes five methods to determine whether nutrient and SS loads and yields are improving: (1) comparison with similar water year 1996; (2) comparison with initial 5-year baseline yields; (3) comparison with baseline data from beginning of program through 2002 (full program baseline); (4) comparison with the LTM; and (5) trend analysis through 2003. Comparison with the year 1996 showed increases at Newport for total nitrogen (TN) and total phosphorus (TP) and increases for flow and TN at Conestoga. Baseline comparisons showed increases in TN and TP at Newport and an increase in TP at Marietta when compared to the initial 5-year baselines, and an increase in all three at Newport and an increase in TP for Marietta when compared to the full program baseline. Comparison with the LTM showed increases at Newport for TN, TP, and SS, increase in flow at Conestoga, and an increase in TP at Marietta. Trends in flow-adjusted concentrations (FACs) were found to be decreasing at Newport for TN and TP and no significant trend at Marietta for TP. TN, TP, and SS were shown to be decreasing at all other sites for all analysis methods.
||See also rept. for Jan 85-Dec 04, PB2006-107694. Sponsored by Environmental Protection Agency, Washington, DC.
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