65 
CB4MH Open—Water 
C 
_ CD 
III 
T3 1: 
% s 
I 3 5 
m o 
b 
i 
1 
• 
• Jr 
V 
0 2 4 6 8 » 12 
Monthly Mean Dissolved Oxygen Concentration 
MOBPH Open-Water 
Monthly Mean Dissolved Oxygen Concentration 
POTOH Open—Water 
_ S 
§ § s 
>»T3 ^ 
a 5 s 
I | s 
1^ M O 
b 
12 
10 
8 
6 
4 
2 
0 
•• 
.1 
i i i i r i i i ■ | i i i i i i i i i | i i ' i i i i i | i» i ' i ' i i i | ' i i i i i ' i i T r i i i i ' 
0 2 4 6 8 10 
Monthly Mean Dissolved Oxygen Concentration 
n-T-r 
12 
CB4MH Deep-Water 
C 
_ CD 
III 
>>13 C 
8 % 8 
I 3,5 
co O 
b 
• 
• 
• • • 
;*«* * : 
0 2 4 6 8 10 12 
Monthly Mean Dissolved Oxygen Concentration 
CHOMH1 Open-Water 
II s 
SNT3 C 
8 > s 
i 3 5 
r- w O 
b 
• 8 
I I I I I I I I | I I I I I I I I I | I I I I I I I I | I I I I 1 I I I I | I I I I I I I I I | I I 1 I 1 1 I I I 
0 2 4 6 8 10 12 
Monthly Mean Dissolved Oxygen Concentration 
PAXMH Open—Water 
Monthly Mean Dissolved Oxygen Concentration 
Figure V-4. Plots of monthly mean dissolved oxygen concentration (mg liter 1 ) versus the 7-day mean dissolved 
oxygen concentration (mg liter 1 ) in several example Chesapeake Bay Program segments: open-water and deep¬ 
water middle central Chesapeake Bay (CB4MH), Mobjack Bay (MOBPH), lower Choptank River (CHOMH1), middle 
Potomac River (POTOH) and lower Patuxent River (PAXMH). 
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 
