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Figure V-l . Plots of monthly mean dissolved oxygen concentration (mg liter 1 ) versus the 1 percentile dissolved 
oxygen concentration as measured by sensors on individual buoys. Plots on left side show patterns of dissolved 
oxygen concentration data pooled across Chesapeake Bay Program segments within open-water, deep-water and 
deep-channel uses. Plots on the right side show patterns of dissolved oxygen concentration data from middle cen¬ 
tral Chesapeake Bay, segment CB4MH. Circles are observed dissolved oxygen concentration data; open triangles are 
dissolved oxygen concentrations predicted by the regression model: 1 percent dissolved oxygen concentration as a 
function of monthly mean dissolved oxygen and the coefficient of variation. 
Source: Chesapeake Bay Water Quality Monitoring Program database. 
http://www.chesapeakebay.net/data 
chapter v 
Guidance for Attainment Assessment of Instantaneous Minimum and 7-Day Mean Dissolved Oxygen Criteria 
