54 
f. 
I 
8 5 
c 
0) 
U) 
8 
CB4MH Open-Water 
Monitoring Data 
£ 
c 
e 
I 
"o 
i s 
Q 8 
12 
« 
8 
8 
8 
2 
0 
-2 
- 
-2 0 2 4 6 8 K) 
Monthly Mean Dissolved Oxygen Concentration 
CB4MH Deep-Water 
Monitoring Data 
c 
o 
1 
TS £ 
5 £ 
t £ 
V) o 
«<3 
CB4MH Deep—Channel 
Monitoring Data 
a> 
o» _ 
F § 
O « 
tj 
I £ 
O 8 
a ° 
•vP 
12 
• 
• 
-2 0216 81012 
Monthly Mean Dissolved Oxygen Concentration 
• 
f % m A 
4 # 
WT. 
-2 0246 81012 
Monthly Mean Dissolved Oxygen Concentration 
c 
CD 
B) 
T3 
I 
8 
CO 
G 
c 
<1) 
G) 
£ 
“D 
| 
8 
CO 
G 
12 
n 
8 
8 
4 
2 
0 
-2 
C 
a) 
f £ 
o n 
1 £ 
8 5 
a ° 
t2 
10 
8 
8 
4 
2 
0 
-2 
CB4MH Open-Water 
Buoy Data 
81 
• - 
• 
8* 
* f 
-2 0 2 4 6 8 10 
Monthly Mean Dissolved Oxygen Concentration 
12 
CB4MH Deep-Water 
Buoy Data 
-2 0 2 4 6 8 10 12 
Monthly Mean Dissolved Oxygen Concentration 
CB4MH Deep—Channel 
Buoy Data 
-2 0 2 16 8 10 
Monthly Mean Dissolved Oxygen Concentration 
12 
Figure V-2. Plots of monthly mean dissolved oxygen concentration (mg liter 1 ) versus the 1 percentile dissolved 
oxygen concentration in middle central Chesapeake Bay, segment CB4MH. Plots on left side show the pattern of 
observed dissolved oxygen concentration data from the Chesapeake Bay Water Quality Monitoring Program 
(May-September 1985-2003). Plots on right side show observed dissolved oxygen data from segment CB4MH as 
measured during various buoy deployments. Circles are observed dissolved oxygen concentrations; open triangles 
are dissolved oxygen concentrations predicted by the regression model: 1 percent dissolved oxygen concentration 
as a function of monthly mean dissolved oxygen concentration and 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 
