Category: Science & Studies
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2014) Annual Average Score by Sampling Station
This map shows the 2014 indicator status of the Benthic Index of Biological Integrity by station.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2013) Annual Average Score by Sampling Station
This map shows the 2013 indicator status of the Benthic Index of Biological Integrity by station.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2014) Percent of Goal Achieved
This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.
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Date created: Jul 02, 2015
Benthic Habitat (Index of Biological Integrity) (2013) Percent of Goal Achieved
This map shows the percent of the Index of Biological Integrity indicator goal achieved by segment.
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Date created: Jan 02, 2014
Sediment Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Watershed Yield: Sediment yields ranged from 9.3 to 648 tons per square mile. Each of the 17 sites in the high yield category carries more than 200 tons of sediment per square mile of watershed. High yielding sites are spatially dispersed across the Susquehanna, Potomac and Rappahannock watersheds. The lowest sediment yielding sits are located on the Eastern Shore and the York River Basin.
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Date created: Jan 02, 2014
Total Phosphorus Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Watershed Yield: Total Phosphorus yields ranged from 0.036 to 0.57 tons per square mile. Each of the 17 sites in the high yield category carries more than 0.19 tons of phosphorus per square mile of watershed. High yielding sites were found in the Eastern Shore, Susquehanna, Potomac, and Rappahannock Watersheds. The lowest yields are generally in the western areas of the Bay watershed and the York River Basin.
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Date created: Jan 02, 2014
Total Nitrogen Yields Measured in Watershed Streams and Rivers, Mean 2008-2012
Watershed Yield: Total Nitrogen yields ranged from 0.33 to 9.87 tons per square mile. Each of the 17 sites in the high yield category carries more than 3.4 tons of nitrogen per square mile of watershed. These sites are generally located on the Eastern Shore, Lower Susquehanna and Northern Potomac Watersheds. The lowest yields, which are less than 1.2 tons per square mile, are generally in the Upper Potomac and Southern Virginia Rivers.
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Date created: Jan 02, 2014
Short Term Flow-Adjusted Trends in Sediment, 2003-2012
Short Term Trend: Over the past 10 years, 49 percent of sites show little change while 41 percent show degrading flow-adjusted sediment concentrations. Between 2003 and 2012: - 4 out of 39 sites show improving flow-adjusted trends for sediment concentrations, - 16 site shows degrading trends, and - 19 sites show small changes that are not statistically significant.
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Date created: Jan 02, 2014
Short-Term Trend in Flow-Adjusted Total Phosphorus Concentration, 2003-2012
Short Term Trend: Over the past 10 years, 63 percent of the monitoring stations show little or no change in flow-adjusted phosphorus concentrations. Between 2003 and 2012: - 9 out of 43 sites show improving flow-adjusted trends for phosphorus concentrations, - 7 site shows degrading trends, and - 27 sites show small changes that are not statistically significant.
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Date created: Jan 02, 2014
Short-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 2003-2012
Short Term Trend: Over the past 10 years, 54 percent of the monitoring stations show improving flow-adjusted nitrogen concentrations. Only one site showed degrading nitrogen conditions. Between 2003 and 2012: - 25 out of 46 sites show improving flow-adjusted trends for nitrogen concentrations, - 1 site shows degrading trends, and - 20 sites show small changes that are not statistically significant.
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