The Determination of Minimum Flows for Sulphur Springs, Tampa

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DRAFT
A bathymetric map of Sulphur Springs Run is shown in Figure 2-7. Water levels in the
spring run fluctuate with tide, and the depths that are shown correspond to NGVD 1929,
which what is about 0.7 ft. below a mean tide level in the spring run. Most of the spring
run is less than two ft. deep at mean tide. Shallow zones are widespread along much of
the shoreline, with deep areas restricted to near the mouth of the spring run and in the
plunge pool just below the discharge point from the spring outlet structure.
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Map prepared May 6, 2003 using 1999 USGS digital
orthophotography and spot elevation data collected
on October 17, 2001 and March 23, 2003 by SWFWMD
staff.
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Figure 2-7. Bathymetric map of Sulphur Springs Run. Yellow lines
are one-half foot contours relative to NGVD, 1929.
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The surface area and volume of the spring run are plotted as a function of elevation in
Figure 2-8. This graphic can be used to evaluate how the area and volume of the run
change as water levels in the run rise and fall. The surface area of the spring run when
water levels are greater than about 0.7 feet NGVD is 3.1 hectares (0.75 acres). Surface
area shows no increase at higher elevations, as water levels rise up the retaining wall
around the run with no increase in surface area. The water volume of the spring run
continues to increase with rising water levels. High tide water levels typically range
between 1.0 and 3.0 ft. NGVD in the run. The volume of water in the run corresponding
to this range of levels is about 1,500 to 3,800 cubic meters (m 3 ), equal to about 53,000
to 134,000 cubic feet (ft. 3 ).
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