Weeki Wachee River System Recommended Minimum Flows and ...

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1.6 Content of Remaining Chapters In this chapter, we have summarized the requirements and rationale for developing minimum flows and levels in general and introduced the need for protection of the flow regime rather than protection of a single minimum flow. The remainder of this document considers the development of minimum flows and levels specific to the Weeki Wachee River, which is defined as the river reach from the head springs near US Highway 50 to the confluence with the Gulf of Mexico at Bayport, FL. Chapters 2 through 5 are intended to be largely descriptive of the system. Not all of the material presented in these chapters was used in setting the MFL, but it is important to characterize the nature of the system under investigation. For example, watershed landuse cannot be reasonably managed as an MFL issue, but it is important to understand that highly urbanized systems generally offer less habitat than relatively pristine systems, and this may have a bearing on the outcome of the MFL. In Chapter 2, we provide a short description of the entire river basin and springshed; the hydrogeologic setting, and consider historical and current river flows and the factors that have influenced the flow regimes. Seasonal blocks corresponding to low, medium and high flows are identified. In Chapter 3 the focus changes to a description of the estuarine characteristics. Chapter 4 is devoted to water quality with a focus on salinity and the relationships with flow. Biological resources are described in Chapter 5 along with quantifiable relationships to flow that have been developed for the MFL evaluation. Goals and specific MFL resource criteria are defined in Chapter 6 while Chapter 7 is devoted to application of evaluation tools to determine what minimum flow(s) achieve the criteria established in the prior chapter. Finally, Chapter 8 provides a definition of the Weeki Wachee MFL. Chapters 9 and 10 contain literature cited and appendices respectively for the prior chapters. With the exceptions noted, the British system of measurement units has been utilized in this report. This will promote consistency with other SWFWMD reports and Governor Crist's Plain Language Initiative 3 that promotes a writing style easily understood by the public. The two exceptions to the British system are river distance (expressed in kilometer) and sample depth (expressed in meters) A table of common conversions is provided following the Table of Contents. One final comment regarding establishment of the MFL is the issue of hydrologic alterations. It is both a practical, and a statutory requirement (373.0421, FS) that the establishment of an MFL shall consider changes and structural alterations. Examples within the District include in-stream impoundments such as exist on the Hillsborough, Manatee, Braden, Withlacoochee Rivers, Shell Creek, Tampa Bypass Canal (TBC) and 3 State initiative can be found at http://www.flgov.com/pl_home ________________________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Purpose and Background Page 11 of 164
Cow Pen Slough (CPS). Some exist for flood control or navigation (Withlacoochee, TBC and CPS), but most have been constructed as potable surface water supplies. The District's policy has been to evaluate free-flowing, un-impounded rivers and estuaries in a 'top-down' manner by attempting to re-create a baseline historical flow as free of anthropogenic impacts as possible. This flow becomes the reference from which 'significant harm' is evaluated. In contrast, systems severely, and irreversibly impacted by hydrologic control structures are evaluated in a 'bottom up' manner. For these systems, the current conditions generally become the starting point for evaluating improvements to minimum system flows and incrementally larger flows are evaluated in order to determine the maximum benefit ratio. In the case of the Weeki Wachee, there are no significant physical hydrologic alterations to the system and a 'top down' approach was utilized. ________________________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Purpose and Background Page 12 of 164
Page 1: Weeki Wachee River System Recommend
Page 4 and 5: Conversion Table Metric to U.S. Cus
Page 6 and 7: 5.2 FISH ..........................
Page 8 and 9: Figure 3-2 Location of Bathymetric
Page 10 and 11: LIST OF TABLES Table 1-1 Rule-of-Th
Page 12 and 13: Table 8-1 Summary of Weeki Wachee M
Page 14 and 15: Executive Summary Minimum Flows and
Page 16 and 17: CHAPTER 1 - PURPOSE & BACKGROUND OF
Page 18 and 19: 1) flood flows that determine the b
Page 20 and 21: the area." What constitutes "signif
Page 22 and 23: Table 1-1 Rule-of-Thumb Estimates f
Page 24 and 25: this report identifies specific res
Page 28 and 29: CHAPTER 2 - WATERSHED CHARACTERISTI
Page 30 and 31: # # # circular vent 1.8 meters in d
Page 32 and 33: Figure 2-5 1970s Aerial with 1999 U
Page 34 and 35: is a variation of the Seminole word
Page 36 and 37: Figure 2-6 Hurricane Tracks near Ba
Page 38 and 39: varied by period. The variation was
Page 40 and 41: 2.3.2 Baseline Period Figure 2-10 i
Page 42 and 43: found (ktau p=0.06) between total g
Page 44 and 45: similarly across the springsheds ex
Page 46 and 47: Figure 2-15 Wavelet Filtered Discha
Page 48 and 49: Figure 2-16 INTB Groundwater Model
Page 50 and 51: 2.6 Seasonal Blocks As described in
Page 52 and 53: Table 2-6 Median (cfs) Flow by Bloc
Page 54 and 55: # # # Surface waters in this stretc
Page 56 and 57: 3.1.3 Segmentation Segmentation was
Page 58 and 59: Figure 3-5 Dominant SAV and Median
Page 60 and 61: Figure 3-6 Sediment Characteristics
Page 62 and 63: Figure 3-7 Shoreline / Buffer Veget
Page 64 and 65: CHAPTER 4 - TIDE, SALINITY & WATER
Page 66 and 67: Two additional harmonic pairs were
Page 68 and 69: Figure 4-5. Median Bottom Salinity
Page 70 and 71: Figure 4-7 Salinity Range (1984-200
Page 72 and 73: uncovering in response to strong wi
Page 74 and 75: 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
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Appendix 4-3 Water Quality Trend Gr
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Water Quality Trend Graphics, conti
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United States Department of the Int
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October 8,2008 Florida Fish and Wil
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Martin Kelly, Ph.D. Page 3 October
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Scientific Peer Review of the Propo
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Determining a low flow need during
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Current state water policy, as expr
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Spring, Twin Dees Spring and possib
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under varying flow regimes. The fir
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Weeki Wachee Rainfall, Springflow a
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6.0 Discharge:Precipitation (cfs/in
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Nevertheless, a major concern with
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system grid is not totally orthogon
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In a hydrodynamic model study, one
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analysis was rather cursory. The Di
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(taxa) richness in the WWRS. If the
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Freshwater Habitats Approximately 1
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ERRATA and EDITORIAL COMMENTS Page
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Page Paragraph Line Comment 14 Some
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Page Paragraph Line Comment 21 The
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Page Paragraph Line Comment 26 The
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REFERENCES Alber, M. 2002. A Concep
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Richter, B. D., J. V. Baumgartner,
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the regression equation used to pre
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and the three independent approache
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The Southwest Florida Water Managem
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the model in terms of tides, salini
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Attachment 1 - Comparison of salini
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Figure 1. Predicted drawdown (feet)
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