Trends and Status of Flow, Nutrients, and Sediment for Selected Nontidal Sites in the Chesapeake Bay
- Published:
- January 1, 2000
- Originator:
- USGS
Data from 30 stream sites in nontidal portions of the Chesapeake Bay Watershed were analyzed tp dpcument annual nutrient and sediment loads and trends for the period 1985 through 1998 as part of an annual water-quality update for the Chesapeake Bay Program. Annual loads were estimated by use of the U.S. GeologicalSurvey ESTIMATOR model and are available upon request. Trends were estimated by use of either linear regression, Seasonal Kendall or Kendall-Their tests. Trends were reported for monthly-mean flow, monthly load, flow-adjusted concentration, and flow-weighted concentration. Trends in flow-adjusted concentrations were downward at nearly all sites for sediment and dissolved solids in the Susquehanna and Potomac River Basins and generally were not significant in the Virginia river basins.