Weeki Wachee River System Recommended Minimum Flows and ...

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The reductions in flow that meet the threshold criteria established in Chapter 6 are presented in both tabular (Table 8-1) and graphic (Figure 8-1) form. There is good agreement between the low flow and high flow evaluations which was expected because of the relatively narrow range and constant nature of springflow. The most conservative reduction is a 4.0 percent reduction in adjusted Block 3 flow which is the result of the 15 ppt volume criterion. The four most conservative reductions range from 4.0 to 8.1 percent flow reduction and all involve the 15 ppt salinity isohaline which is the result of the compressed nature of the system, particularly in the vicinity of isohalines greater than about 8 ppt. That is, salinities are changing rapidly in the river between kilometer 0 and 0.5. Thus, a relatively small change in flow translates to larger change in upstream volume or area than similar changes occurring upstream. For example, under high flow conditions (Block 3) the 14 ppt bottom isohaline is located at approximately Rkm = 0.24 or very near the mouth. At this location, there are 248,600 m 3 of volume upstream and the slope at this location is 124,300 m 3 /km. By contrast, under the same flow conditions the 2 ppt isohaline occurs at a location where the slope is only 38,100 m 3 /km. It will require only a 0.30 km upstream shift in the location of the 14 ppt isohaline to reduce the upstream volume by fifteen percent, but it will require a 0.46 km upstream shift of the 2 ppt isohaline to achieve the same percentage of volume reduction. In addition to the volume/km slope changes (Figure 3-3) the flow response term (B 1 – See Table 4-7) in the isohaline regressions is considerably greater for the 14 ppt isohaline than for the 2 ppt isohaline further increasing the sensitivity. Table 8-1 Summary of Weeki Wachee MFL Results Criteria Flow Adjusted Withdrawals Block 1 Block 3 (1) Freshwater Freshwater - Wide Site PHABSIM Yes 12.0% 12.0% Freshwater - Sandbag PHABSIM Yes 8.0% 10.0% Salinity Habitat 2 ppt - Volume 15% Loss in volume Median Yes 10.1% 11.5% 5 ppt - Volume 15% Loss in volume Median Yes 8.5% 9.5% 15 ppt - Volume 15% Loss in volume Median Yes 6.0% 4.2% 2 ppt - Bottom Area 15% Loss in Area Median Yes 15.8% 17.2% 3.5 ppt - Bottom Area 15% Loss in Area Median Yes 14.3% 15.3% 5 ppt - Bottom Area 15% Loss in Area Median Yes 12.9% 13.7% 11.5 ppt - Bottom Area 15% Loss in Area Median Yes 9.9% 9.4% 15 ppt - Bottom Area 15% Loss in Area Median Yes 8.2% 5.5% Benthos Shannon-Wiener H' 15% Loss in peak Median No 12.8% 14.1% # Taxa 15% Loss in peak Median No 10.4% 11.5% Total Abundance 15% Loss in peak Median No 9.1% 10.0% Mollusc Abundance Polymesoda Caroliniana (n/m 2 ) 15% Loss in peak Median No 7.3% 8.1% Crassostrea Virginica (n/m 2 ) 15% Loss in peak Median No 8.2% 9.1% Littoraria irrorata (n/m 2 ) 15% Loss in peak Median No 8.8% 9.8% (Bold red italic = based on extended interpolation into Gulf without bracketing values.) MFL_Summary. xls (1) Freshwater Block 2 Results ____________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Conclusions and Recommendations Page 114 of 164
Figure 8-1 Summary of Weeki Wachee MFL Results 20 18 Block 3 High Flow Scenarios Block 1 Low Flow Scenarios MFLs_b.grf 16 % Reduction in Baseline Flow Causing 15% Loss of Resource 14 12 10 8 6 4 2 0 15 ppt - Volume P. Caroliniana P Caroliniana Mean = 10.7 % 15 ppt - Area 5 ppt - Volume Total Abundance 11.5 ppt - Area L. irrorata PHABSIM -Site 1 2 ppt - Volume # Taxa PHABSIM - Site 2 Shannon-Wiener H' 5 ppt - Area 3.5 ppt - Area 2 ppt - Area 2 ppt - Area 3.5 ppt - Area Shannon-Wiener H' 5 ppt - Area PHABSIM - Site 2 2 ppt - Volume Mean = 10.1 % # Taxa Total Abundance 11.5 ppt - Area 5 ppt - Volume C. Virginica L. irrorata C. Virginica PHABSIM -Site 1 15 ppt - Volume 15 ppt - Area Ordinarily the MFL would be established based on the most restrictive outcome, or in the case of the Weeki Wachee, on the shift in the 15 ppt isohaline. However, in the case of the Weeki Wachee the 15 ppt isohaline occurs below the confluence of the Mud River in the Block 1 (low flow) evaluation and in the Gulf beyond the mouth of the river under the high flow evaluation (Block 3). Both conditions create problems for interpretation. In the former case, the discharge from the Mud River is highly saline and the rate is generally unknown. While there have been a few dozen sporadic measurements there has never been a continuous measurement. The sporadic measurements range from -51 to +128 cfs suggesting a highly variable flow. The combination of these factors ____________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Conclusions and Recommendations Page 115 of 164
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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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Page 80 and 81: A regression of the form below was
Page 82 and 83: Table 4-8 Median Water Quality of W
Page 84 and 85: Figure 4-10 Nitrate Concentration a
Page 86 and 87: CHAPTER 5 - BIOLOGICAL CHARACTERIST
Page 88 and 89: Figure 5-1 Principal Component Anal
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Page 92 and 93: 5.2.2 Relation to inflow Response t
Page 94 and 95: Table 5-7 Location Response (km u )
Page 96 and 97: Table 5-9 Abundance Response to Inf
Page 98 and 99: animals can survive chronic exposur
Page 100 and 101: Figure 5-3 Number of Aerial Manatee
Page 102 and 103: Figure 5-5(a) Molluscan Presence /
Page 104 and 105: Table 5-11 Rank Order of Mollusc Ab
Page 106 and 107: Figure 5-5 Polymesoda caroliniana A
Page 108 and 109: Figure 6-1 Plankton Tow Flows Compa
Page 110 and 111: In application, a baseline area and
Page 112 and 113: 6.1.4 Benthos Protection for benthi
Page 114 and 115: Figure 6-3. Location of the Three P
Page 116 and 117: 7.2 Manatee Approach Establishing a
Page 118 and 119: Figure 7-2 Joint Probability of Occ
Page 120 and 121: Figure 7-3 Maximum Day Manatee Usag
Page 122 and 123: Figure 7- 6 Example Calculations fo
Page 124 and 125: Figure 7- 7 Estimation of Flow Redu
Page 126 and 127: Figure 7-8. Summary Results for the
Page 130 and 131: probably accounts in part for the d
Page 132 and 133: Postel, S. and B.Richter. 2003. Riv
Page 134 and 135: Stanford, J.A., J.V.Ward, W.J. Liss
Page 136 and 137: Culter, J.K. 1986. Water Chemistry.
Page 138 and 139: CHAPTER 10 - APPENDICES 10.1 Append
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Page 144 and 145: 0 if no significant withdrawal Z =
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Page 150 and 151: Lecanto 1 & 2 #S Well Site Descript
Page 152 and 153: Figure 4. HSPF subbasins in the INT
Page 154 and 155: Most of the limestone mines located
Page 156 and 157: 3.1.3 Septic Tank Recharge in the S
Page 158 and 159: Figure 10. Groundwater grid in the
Page 160 and 161: Basso, R.J., 2004, Hydrogeologic Se
Page 162 and 163: 10.2 Appendices - Chapter 3 Appendi
Page 164 and 165: 10.3 Appendices - Chapter 4 Appendi
Page 166 and 167: 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
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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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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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