Nutrient, Sediment, and Flow
Nutrient, Sediment, and Flow
The Chesapeake Bay Program (CBP) is working to reduce nutrients and sediment to improve conditions in the Bay and the health of streams. The USGS, working with partners, monitors nutrients and sediment through a watershed network and works to assess and explain trends. The findings are used to help the CBP address its water-quality goal.
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Chesapeake Bay Water-Quality Loads and Trends
Access the most recent data gathered from the Chesapeake Bay Nontidal Monitoring Network , learn about the techniques used to collect this data, and read about the history of the Chesapeake Bay Nontidal Monitoring Program. Nontidal Network (NTN) data refers to data from the 123 monitoring stations where nutrients and sediment are collected monthly and during storms. River Input Monitoring (RIM)...
USGS Enhances Statistical Techniques to Assess Water-Quality Trends
The USGS has completed more enhancements to our innovative technique to assess water-quality trends. The WRTDS (Weighted Regressions on Time Discharge and Season) method was first published in 2010 as an exploratory data analysis technique for understanding trends in surface water. Subsequently, we published the EGRET (Exploration and Graphics for RivEr Trends) software which implements the WRTDS...
USGS Results on Phosphorus Trends
USGS results on phosphorus trends reveal little progress over the past decade. USGS results show phosphorus trends over the past decade do not show improving conditions at a majority of the sites. Water-quality managers call for more actions to increase progress.
Determining Nutrient and Sediment Loads and Trends in the Chesapeake Bay Watershed by Using An Enhanced Statistical Technique
As the largest and most productive estuary in North America, Chesapeake Bay is a vital ecological and economic resource. In recent decades, however, the bay and its tributaries have been degraded by excessive inputs of nutrients (nitrogen and phosphorus) and sediment from contributing watersheds, and in 1998, the Chesapeake Bay and its tidal tributaries were listed as “impaired” under the Clean...