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Long-Term Trends for Secchi Disc Depth in the Chesapeake Bay: 1999-2013

Long-term trends were computed by state partners using the Seasonal Kendall non-parametric technique for annual data collected from 1999-2013. Highly significant trends are indicated with triangles and possible trends are show with colored circles. Secchi Disk Depth observations (a measure of water clarity) are increasing/improving significantly at 2 stations, possibly increasing at 2 stations, decreasing/degrading significantly at 28 stations, and possibly decreasing at 14 stations.

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Mid-Channel Water Clarity (2011)

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2011.

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Mid-Channel Water Clarity (2010)

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2010.

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Mid-Channel Water Clarity (2009)

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2009.

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Mid-Channel Water Clarity (2008)

This map shows the percent of the Water Clarity goal achieved for each Chesapeake Bay Segment in 2008.

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Chesapeake Bay Segmentation Scheme (For 303d listing - 92 segments)

The 92-segment scheme for the Chesapeake Bay and its tidal tributaries used for dissolved oxygen and water clarity assessments in the most recent 303d/305b listing efforts of the four Bay tidal jurisdictions is documented here. The 92-segment scheme was derived from 1) the 2003 published 78-segment scheme with the addition of jurisdictional boundary lines imposed to create 89-segments, then 2) additionally includes only split segments agreed upon for the tidal James and Potomac rivers.

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Mid-Channel Water Clarity (2007)

This map shows the percent passing of the Water Clarity goals for each Chesapeake Bay Segment in 2007.

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