5 
Figure 11-2. Percent occurrence of bottom water temperatures greater than 29°C from 
June- September 1996-2002 at the Chesapeake Bay Water Quality Monitoring Program 
stations located in the District of Columbia's tidal waters. 
Source: Chesapeake Bay Water Quality Monitoring Program database. 
http://www.chesapeakebay.net/data 
were high enough to trigger routine application of the 4.3 mg liter 1 instantaneous 
minimum criterion in District of Columbia tidal waters (Figure II-3). 
To further narrow down on those tidal water habitats where the temperature-based 
4.3 mg liter 1 instantaneous minimum dissolved oxygen criterion would likely 
routinely apply, the baywide data set described previously was examined for the 
number of bottom water dissolved oxygen concentrations less than 4.3 mg liter 1 
when the corresponding bottom water temperature exceeded 29°C. Over the summer 
periods of 1996 through 2002, there were a total of 20 incidences of these two condi¬ 
tions among 9 stations. Five of the stations were in the Southern Branch Elizabeth 
River and there was one station each in the tidal fresh segments of the Choptank, 
Patuxent, and Pamunkey rivers and in the oligohaline segment of the Rappahannock 
River (Figure II-4). 
chapter ii 
Shortnose Sturgeon Temperature Sensitivity Analyses 
