The Determination of Minimum Flows for Sulphur Springs, Tampa

DRAFT
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
35
35
30
30
Temperature (oC)
25
20
Sulphur Springs Temperature
25
20
15
15
10
SS_TempAllcodes2.grf
10
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Year
Figure 3-25. Seasonal temperature variations in Sulphur Springs pool
taken from monthly data recorded by the City of Tampa
Average daily water temperatures at the continuous recorders in the spring pool and
upper spring run are plotted in Figure 3-26 along with withdrawals from the spring pool.
Similar to the monthly data, daily temperatures in the pool display a very minor seasonal
variation, generally fluctuating within one degree of a mean temperature of 25 o C. When
there are no withdrawals from the spring, water temperature in the run closely tracked
the temperature of the pool. When withdrawals occurred, temperatures in the run varied
from the pool temperature, being colder in the winter months and warmer in the summer
months. These deviations represent the movement of water from the Hillsborough River
into the run during withdrawals. Withdrawals during October or April do not cause such
temperature changes in the run, as the river and spring are near the same temperature
during these months.
A similar relationship is seen at the mouth of the spring (Figure 3-27). Like the results
for salinity (Section 3.4), these data indicate the thermal characteristics of the upper and
lower run are very similar to the spring pool in the absence of withdrawals. However,
withdrawals can affect temperature in the run depending on the magnitude of the
withdrawal and water temperatures in the river at the time of the withdrawal.
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