Weeki Wachee River System Recommended Minimum Flows and ...

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Page Paragraph Line Comment 26 The implication of the regression line in Figure 2-12 is that it represents a reduction in flow from the spring(s). It’s important to ask the question about how much of any trend that is present in the post-1960 data is reflective of pumpage as opposed to climatic events. 1960 was a significant tipping point in terms of rainfall as well as water levels in the area. There is a widespread pattern similar to the Weeki Wachee discharge pattern with a peak in water levels and/or discharge in the 1960s all the way from the Georgia line to the southern part of the District’s service area. You can relate that pattern to rainfall and, in some cases, to changes in gages, measurement methods, and human activities. To simply place a regression line on a graph and then jump into talking about change from 1960 to present begs the question as to why the discharge increased from 1930 to 1960. This is also a good place to talk about the AMO and the different process that may affect water levels and discharges. 27 1 4 Remove the word “and” at the end of the line. 27 1 5 Location of the Sharpes Ferry Well, in relationship to the Weeki Wachee Well and Spring, should be given. Also provide some justification for saying that it is unimpacted. 30-31 References for the Northern Tampa Bay Model and Northern District Model are needed here. 31 2 5 If UFA stands for “upper Floridan aquifer,” does that mean SAS stands for “surficial aquifer system?” 32 1 2 Why is the average 17 cfs of anthropogenic impact linearly proportioned over the 1961-2004 period? Why not allocate proportions according to the increases in pumpage or rainfall patterns? Does this mean that years with high discharge have the same percent flow reduction as low-flow years? This seems doubtful. 33 The District used three different methods for estimating a baseline flow condition that is as free of anthropogenic impacts as possible. This is variously referred to as “normalized” annual discharge, “standardization” of springflows, and “adjusted” flows. However, most hydrologists would recognize the adjusted discharge plot in Figure 2-17 as an attempt to create a “naturalized” flow record, wherein human impacts have been removed by adding back to the observed record any water withdrawals, such as pumpage, and subtracting out any water additions, such as wastewater discharges that could supplement aquifer recharge. 35 2 6 Indicate that the 12.7 cfs pumpage adjustment is an average and that it is being added to flow blocks based on medians. The appropriateness or effect of mixing these central tendency values is not addressed in the report. 34
Page Paragraph Line Comment 36 2 7 Replace word “allied” with “applied.” 44 An attempt should probably be made to explain the “spike” in % organic sediment of Weeki center line (red) at R km ~ 1.5. 59 4 1 The use of Cox polynomials (Cox 1967, Jaegar 1973) represents an older method of estimating salinity from conductivity measurements that has an accuracy of about ± 0.003, where the error is due to seawater constituents, such as SiO 2 , which cause changes in density but no change in conductivity. In 1978, the Practical Salinity Scale (PSS) was introduced to refine the traditional definition of salinity in uniform terms of a new international equation of state for seawater based on the conductivity ratio of a seawater sample to a standard KCl solution (Lewis and Perkin 1978) with an error of ± 0.001 across the world’s oceans (Hill et al. 1989). However, errors rise to ± 0.01 or more in the lower salinity waters of coastal bays and estuaries where the use of the PSS caused many concerns (Parsons 1982). Moreover, since ratios have no units, Millero and Poisson (1981) noted that the new PSS is dimensionless and scales such as parts per thousand (either ppt or ‰) should not be used. The correct way to report practical salinity is as a number (e.g., the sample had a salinity of 35). This has caused some confusion and even led to the introduction of another scale referred to as “practical salinity units” (psu) that is also technically invalid. Although considered incorrect by many oceanographers and scientific journal editors, the Panel’s peer review used the same convention as the District in this report and referred to salinity values as ppt with apologies to Millero and Poisson, and virtually all the major oceanographic groups (i.e., ASLO, CERF, IAPSO, ICES, IOC, UNESCO, SCOR, etc.). 71 1 The text refers to Figures 5-1a and 5-1b; however, the figure title on page 72 only refers to “top” and “bottom” panels, and the figures themselves are not labeled. 35
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Weeki Wachee River System Recommend
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Conversion Table Metric to U.S. Cus
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5.2 FISH ..........................
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Figure 3-2 Location of Bathymetric
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LIST OF TABLES Table 1-1 Rule-of-Th
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Table 8-1 Summary of Weeki Wachee M
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Executive Summary Minimum Flows and
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CHAPTER 1 - PURPOSE & BACKGROUND OF
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1) flood flows that determine the b
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the area." What constitutes "signif
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Table 1-1 Rule-of-Thumb Estimates f
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this report identifies specific res
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1.6 Content of Remaining Chapters I
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CHAPTER 2 - WATERSHED CHARACTERISTI
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# # # circular vent 1.8 meters in d
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Figure 2-5 1970s Aerial with 1999 U
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is a variation of the Seminole word
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Figure 2-6 Hurricane Tracks near Ba
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varied by period. The variation was
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2.3.2 Baseline Period Figure 2-10 i
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found (ktau p=0.06) between total g
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similarly across the springsheds ex
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Figure 2-15 Wavelet Filtered Discha
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Figure 2-16 INTB Groundwater Model
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2.6 Seasonal Blocks As described in
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Table 2-6 Median (cfs) Flow by Bloc
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# # # Surface waters in this stretc
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3.1.3 Segmentation Segmentation was
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Figure 3-5 Dominant SAV and Median
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Figure 3-6 Sediment Characteristics
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Figure 3-7 Shoreline / Buffer Veget
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CHAPTER 4 - TIDE, SALINITY & WATER
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Two additional harmonic pairs were
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Figure 4-5. Median Bottom Salinity
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Figure 4-7 Salinity Range (1984-200
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uncovering in response to strong wi
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E) Salinity = β o + β 1 *Flow 2 +
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Additional exploratory attempts usi
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86 = 186 cfs, SWFWMD 1994-96 = 167
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A regression of the form below was
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Table 4-8 Median Water Quality of W
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Figure 4-10 Nitrate Concentration a
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CHAPTER 5 - BIOLOGICAL CHARACTERIST
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Figure 5-1 Principal Component Anal
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measured volume sampled which was t
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5.2.2 Relation to inflow Response t
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Table 5-7 Location Response (km u )
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Table 5-9 Abundance Response to Inf
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animals can survive chronic exposur
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Figure 5-3 Number of Aerial Manatee
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Figure 5-5(a) Molluscan Presence /
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Table 5-11 Rank Order of Mollusc Ab
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Figure 5-5 Polymesoda caroliniana A
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Figure 6-1 Plankton Tow Flows Compa
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In application, a baseline area and
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6.1.4 Benthos Protection for benthi
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Figure 6-3. Location of the Three P
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7.2 Manatee Approach Establishing a
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Figure 7-2 Joint Probability of Occ
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Figure 7-3 Maximum Day Manatee Usag
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Figure 7- 6 Example Calculations fo
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Figure 7- 7 Estimation of Flow Redu
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Figure 7-8. Summary Results for the
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The reductions in flow that meet th
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probably accounts in part for the d
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Postel, S. and B.Richter. 2003. Riv
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Stanford, J.A., J.V.Ward, W.J. Liss
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Culter, J.K. 1986. Water Chemistry.
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CHAPTER 10 - APPENDICES 10.1 Append
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The wavelet used is the symmlets wa
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explains, the energy plot shows the
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0 if no significant withdrawal Z =
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One advantage of using this regress
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Technical Memorandum January 22, 20
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Lecanto 1 & 2 #S Well Site Descript
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Figure 4. HSPF subbasins in the INT
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Most of the limestone mines located
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3.1.3 Septic Tank Recharge in the S
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Figure 10. Groundwater grid in the
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Basso, R.J., 2004, Hydrogeologic Se
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10.2 Appendices - Chapter 3 Appendi
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10.3 Appendices - Chapter 4 Appendi
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Appendix 4-2 Data Sources Water qua
Page 168 and 169: Appendix 4-3 Water Quality Trend Gr
Page 170 and 171: Water Quality Trend Graphics, conti
Page 180 and 181: United States Department of the Int
Page 182 and 183: October 8,2008 Florida Fish and Wil
Page 184 and 185: Martin Kelly, Ph.D. Page 3 October
Page 186 and 187: Scientific Peer Review of the Propo
Page 188 and 189: Determining a low flow need during
Page 190 and 191: Current state water policy, as expr
Page 192 and 193: Spring, Twin Dees Spring and possib
Page 194 and 195: under varying flow regimes. The fir
Page 196 and 197: Weeki Wachee Rainfall, Springflow a
Page 198 and 199: 6.0 Discharge:Precipitation (cfs/in
Page 200 and 201: Nevertheless, a major concern with
Page 202 and 203: system grid is not totally orthogon
Page 204 and 205: In a hydrodynamic model study, one
Page 206 and 207: analysis was rather cursory. The Di
Page 208 and 209: (taxa) richness in the WWRS. If the
Page 210 and 211: Freshwater Habitats Approximately 1
Page 212 and 213: ERRATA and EDITORIAL COMMENTS Page
Page 214 and 215: Page Paragraph Line Comment 14 Some
Page 216 and 217: Page Paragraph Line Comment 21 The
Page 220 and 221: REFERENCES Alber, M. 2002. A Concep
Page 222 and 223: Richter, B. D., J. V. Baumgartner,
Page 224 and 225: the regression equation used to pre
Page 226 and 227: and the three independent approache
Page 228 and 229: The Southwest Florida Water Managem
Page 230 and 231: the model in terms of tides, salini
Page 232 and 233: Attachment 1 - Comparison of salini
Page 234 and 235: Figure 1. Predicted drawdown (feet)
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