Water Quality Goal Implementation Team (GIT 3) Publications

The Water Quality Goal Implementation Team works to evaluate, focus and accelerate the implementation of practices, policies and programs that will restore water quality in the Chesapeake Bay and its tributaries to conditions that support living resources and protect human health.

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

Published on June 1, 1993

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.

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