Water Quality Goal Implementation Team (GIT 3) Publications

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2017 Technical Addendum Ambient Water Quality Criteria for Dissolved Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and Its Tidal Tributaries

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This 2017 addendum provides previously undocumented features of the procedures for assessing attainment of the Chesapeake Bay water quality criteria as well as refinements and clarifications to the previously published Chesapeake Bay water quality criteria assessment procedures.

View document [PDF, 4.2 MB] 2017 Technical Addendum Ambient Water Quality Criteria for Dissolved Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and Its Tidal Tributaries

Comparison of Mid-Bay and Lateral Station Water Quality Data in the Chesapeake Bay Mainstem

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Seasonal median water quality values were compared between stations in mid-Bay and lateral regions in seven east-west transects in the mainstem Chesapeake Bay. Comparisons were made over seven years, 1985-1991, for April-October surface layer medians of total phosphorus, total nitrogen, dissoslved orthophosphate, dissolved inorganic nitrogen, total suspended solida, chlorophyll a, Secchi depth, and salinity. Comparisons were also made using spring (March-May) and summer (June-September) medians of surface and bottom salinity and dissolved oxygen. Comparisons were made using difference plots of raw data, scatter plots of annual seasonal medians, nand the Wilcoxon matched-pairs test on annual seasonal medians. The graphical and statistical analyses confirmed each other. Correlation coefficients were also calculated between mid-Bay and lateral data series to estimate their degree of similarity over time, but could not be tested for statistical significance.

View document [PDF, 476.8 KB] Comparison of Mid-Bay and Lateral Station Water Quality Data in the Chesapeake Bay Mainstem

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