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 dissolved oxygen concentrations begin to increase at 6 a.m. and prior to hydropower generation and
coincident with increasing light availability and continue to increase until hydropower generation near 1
p.m. completely flushes the system. Most dams provide some form of reaeration during release due to
(A)
40
35
D.O.
Temp
30
25
20
15
10
5
0
(B)
Figure 1.3.11 Temperature and dissolved oxygen concentrations from the releases from Hartwell
Dam (a peaking hydropower project on the Georgia and South Carolina border) depicting A)
seasonal and annual cycles and B) daily cycles.
1.3-14
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