Maps
Browse through maps depicting Bay health and restoration, including pollution trends, public access sites and more.
Category: Science & Studies
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Date created: Jan 02, 2014
Long Term Flow-Adjusted Trends in Sediment, 1985-2012
Long Term Trend: Forty-four percent of long-term stream monitoring sites in the Chesapeake Bay Watershed show little change in flow-adjusted concentrations of sediment. The remaining sites were evenly split between improving and degrading conditions. Between 1985 and 2012: - 8 out of 29 sites show improving flow-adjusted trends for sediment concentrations, - 8 sites show degrading trends, and - 13 sites show small changes that are not statistically significant.
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Date created: Jan 02, 2014
Long-Term Trend in Flow-Adjusted Total Phosphorus Concentration, 1985-2012
Long Term Trend: Seventy-three percent of long-term stream monitoring sites in the Chesapeake Bay Watershed show improving flow-adjusted concentrations of phosphorus. Between 1985 and 2012: - 22 out of 30 sites show improving flow-adjusted trends for phosphorus concentrations, - 4 sites show degrading trends, and - 4 sites show small changes that are not statistically significant.
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Date created: Jan 02, 2014
Long-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 1985-2012
Long Term Trend: Seventy percent of long-term stream monitoring sites in the Chesapeake Bay Watershed have improving flow-adjusted concentrations of nitrogen. Between 1985 and 2012: - 21 out of 30 sites show improving flow-adjusted trends for nitrogen concentrations, - 3 sites show degrading trends, and - 6 sites show small changes that are not statistically significant.
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Date created: Jul 08, 2013
Dissolved Oxygen, Percent Goal Achieved for 2012, 3 YR Analysis
The 2012 Dissolved Oxygen Indicator showing Percent of Goal Achieved using the three year analysis method.
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Date created: May 29, 2013
Average 2000-2010 Stream Health in the Chesapeake Bay Sub-watersheds
An effective way to measure the health of freshwater streams and rivers is to study the many tiny critters that live in these waters, called “benthic macro-invertebrates.” The abundance and diversity of snails, mussels, insects and other bottom-dwelling organisms are good indicators of the health of streams because they can’t move very far and they respond to pollution and environmental stresses. Benthic macroinvertebrates are generally harmed by direct and indirect effects of pollutants such as metals, acidity, sediment, pesticides, nitrogen and phosphorus. These pollutants come from sources such as mining, agriculture, urban and suburban runoff, automobile and power plant exhaust, and wastewater treatment facilities. Health of streams was evaluated by the Chesapeake Bay Basin-wide Benthic Index of Biotic Integrity (or “Chessie B-IBI”), which was developed from benthic macroinvertebrate data collected across the entire Chesapeake Bay watershed from over 20 federal, state, local, and river basin commission monitoring programs throughout the Chesapeake Bay basin. Each sampling event is scored on a standardized quantitative scale that allows scoring across jurisdictional boundaries. B-IBI scores were averaged for each site over all years of sampling (2000-2010) and then qualitatively categorized in one of the following categories – very poor, poor, fair, good or excellent for a total of 15,112 scored sites. An analysis was conducted on a subset of the 15,112 sites to investigate regional variation in the B-IBI scores. The subset of sites (8,871) were chosen where a random sampling design was used. By using only randomly selected sites, BIBI scores can be averaged across the smallest feasible watershed size without introducing bias associated with sampling designs that target areas with known degraded or high quality waters. For more information see: Buchanan, C., K. Foreman, J. Johnson, and A. Griggs. 2011. Development of a Basin-wide Benthic Index of Biotic Integrity for Non-Tidal Streams and Wadeable Rivers in the Chesapeake Bay Watershed: Final Report to the Chesapeake Bay Program Non- Tidal Water Quality Workgroup. ICPRB Report 11-1. Report prepared for the US Environmental Protection Agency, Chesapeake Bay Program.
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Date created: Apr 22, 2013
Phytoplankton (Index of Biological Integrity) (2012) Percent of Goal Achieved
The Phytoplankton (Index of Biological Integrity) map shows the percent of the goal achieved by CBP Monitoring Segment.
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Date created: Apr 22, 2013
Phytoplankton (Index of Biological Integrity) (2012) Annual Average Score by Sampling Station
The map shows the average Index of Biological Integrity Score for phytoplankton by monitoring station.
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Date created: Mar 28, 2013
Benthic Habitat (Index of Biological Integrity) (2012) Annual Average Score by Sampling Station
This map shows the 2012 indicator status of the Benthic Index of Biological Integrity by station.
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Date created: Mar 28, 2013
Benthic Habitat (Index of Biological Integrity) (2012) 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: Feb 28, 2013
Maryland Tier II Catchments
Non- tidal watersheds, under regulatory anti-degradation protection, that exceed minimum applicable water quality criteria and standards. Currently, Tier II streams are identified according to fish and benthic indices of biotic integrity.
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