41 
Open Water Monthly Dissolved Oxygen Biological Reference Curve 
Percent of Volume 
Figure IV-2. Chesapeake Bay open-water 30-day mean dissolved oxygen criterion 
biological reference curve applicable only during the June 1 through September 30 
assessment period. 
Figure IV-3. Chesapeake Bay deep-water 30-day mean dissolved oxygen criterion 
biological reference curve. 
chapter iv 
Refinements to the Chesapeake Bay Dissolved Oxygen Criteria Assessment Procedures 
