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A development along the mouth of the Elk River, a tributary of the Chesapeake Bay.

National and Regional Assessments Team (NRAT)

Studies within the USGS Maryland-Delaware-DC Water Science Center are divided into teams. To find out more about the NRAT's current projects, publications, and capabilities, please visit the links in the left menu.

NRAT Publications



SIR 2011-5167 Cover

Abstract: An empirical model was used to provide estimates of the sources, fate, and transport of total nitrogen and total phosphorus in the Chesapeake Bay watershed. Restoration efforts in recent decades have been insufficient to meet established standards for water quality and ecological conditions in Chesapeake Bay. Effective and efficient nutrient management at the regional scale in support of Chesapeake Bay restoration requires a comprehensive understanding of the sources, fate, and transport of nitrogen and phosphorus in the watershed, which is only available through regional models.

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SIR 2012-5266 Cover

Abstract: Nitrogen from nonpoint sources contributes to eutrophication, hypoxia, and related ecological degradation in Atlantic Coastal Plain streams and adjacent coastal estuaries such as the Chesapeake Bay and Pamlico Sound. Although denitrification in depressional wetlands common to the Coastal Plain can be a significant landscape sink for nitrogen, the effectiveness of individual wetlands at removing nitrogen varies substantially due to varying hydrogeologic, geochemical, and other landscape conditions. A geographic model was constructed that describes the spatial variability in the effectiveness of depressional wetlands at mitigating nitrogen transport from nonpoint sources to surface waters.

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SIR 2012-5235 Cover

Abstract: Nitrate is a common contaminant in groundwater and surface water throughout the Nation, and water-resource managers need more detailed small-scale watershed research to guide conservation efforts aimed at improving water quality.

Concentrations of nitrate in Bucks Branch are among the highest in the state of Delaware and a scientific investigation was performed to provide water-quality information to assist with the management of agriculture and water resources.

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Additional NRAT Publications


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