Alafia River Minimum Flows and Levels - Southwest Florida Water ...

Figure 2-33. Phosphorus concentrations in water samples collected by the USGS
at the South Prong Alafia River near Lithia, FL. Upper plot is time series plot;
middle plot is concentration versus flow, and the bottom plot is time series
plot of residuals of phosphorus concentration regressed against flow.......2-69
Figure 2-34. Fluoride concentrations in water samples collected by the USGS at
the Alafia River at Lithia, FL. Upper plot is time series plot; middle plot is
concentration versus flow, and the bottom plot is time series plot of residuals
of phosphorus concentration regressed against flow.................................2-71
Figure 2-35. Phosphorus concentrations in water samples collected by the USGS
at the Peace River at Arcadia, FL gage. Upper plot is time series plot; middle
plot is concentration versus flow, and the bottom plot is time series plot of
residuals of phosphorus concentration regressed against flow..................2-72
Figure 2-36. Nitrate or nitrate/nitrite concentrations in water samples collected by
the USGS at the Alafia River at Lithia, FL gage. Upper plot is time series
plot; middle plot is concentration versus flow, and the bottom plot is time
series plot of residuals of phosphorus concentration regressed against flow.2-
74
Figure 2-37. Nitrate or nitrate/nitrite nitrogen concentrations in water samples
collected by the USGS at the Withlacoochee River at Holder, FL gage.
Upper plot is time series plot; middle plot is concentration versus flow, and
the bottom plot is time series plot of residuals of phosphorus concentration
regressed against flow...............................................................................2-75
Figure 2-38. Potassium concentrations in water samples collected by the USGS
at the Alafia River at Lithia, FL gage. Upper plot is time series plot; middle
plot is concentration versus flow, and the bottom plot is time series plot of
residuals of phosphorus concentration regressed against flow..................2-78
Figure 3-1. Example of low flow in riffle or shoal area. Many potential in-stream
habitats such as limestone (foreground), snags, sandbars, and exposed roots
are not inundated in this stream reach under low flow conditions................3-8
Figure 4-1. Study corridor for the Alafia River.....................................................4-2
Figure 4-2. Location of USGS transects on the Alafia River used for HEC-RAS
analyses. Figure reprinted from Robertson (1978). ....................................4-3
Figure 4-3. Location of eleven shoals identified on the Alafia River....................4-4
Figure 4-4. Downstream vegetation cross section (transect) locations and GAP
classes on the Alafia River...........................................................................4-6
Figure 4-5. Upstream vegetation cross-section (transect) locations and GAP
classes for the Alafia River ..........................................................................4-7
Figure 4-6. Weighted usable area (WUA) versus discharge for spotted sunfish in
the Alafia River at PHABSIM cross-section 64. .........................................4-13
Figure 4-7 Example of a plot of habitat gain/loss relative to flow reductions of 10,
20, 30, and 40%. Data were obtained from time series analysis and the flow
reductions are relative to the historic flows recorded at the USGS Lithia Gage
site from 1970-1999...................................................................................4-14
Figure 4-8. RALPH plot of the number of days during the southern river pattern
water year (SRPWY) that 200 cfs is exceeded at the USGS Lithia gage on
the Alafia River. .........................................................................................4-17
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