Weeki Wachee River System Recommended Minimum Flows and ...

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Figure 7- 6 Example Calculations for Benthic Diversity Shannon-Wiener Diversity (H') 3 2 1 0 -1 H' = 1.41 + 0.326* Sal - 0.021*Sal 2 WW_Chas_Bentho_b 0 2 4 6 8 10 12 14 16 18 20 Salinity (ppt) Given Maximum Benthos Diversity Occurs at Salinity of 8.0 ppt. H' = 1.41 +0.326* 8.0 ppt -0.021 * (8 ppt ) 2 H' = 2.67 15% Reduction in Diversity = 0.85 * 2.67 = 2.27 2.27= 1.41 +0.326* X ppt -0.021 * (X ppt ) 2 X = 12.2 ppt ********************************************************* Where does 8.0 ppt occur under Block 1 Flow of 144 cfs ? From Longitudinal Salinity Model : Iso_km = -0.8929 + 593.4 *(1/Q)-0.152*Sal Where Q = 144 cfs and Sal = 8.0 ppt Iso_Km = 2.01 km Holding Iso_Km constant, what flow will result in Sal = 11.15 ppt ? 2.01 km = -0.8929 + 593.4 *(1/Q)-0.152*12.2 ppt Q = 124.9 cfs Flow Reduction = 100*[(144-124.9/144)] = 13.3 % ____________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Technical Approach Page 107 of 164
Using diversity as an example, salinity at the peak of the diversity was determined from graphs (Janicki, 2006) illustrating response to salinity. At a salinity of 8.0 ppt, the maximum diversity of 2.7 was reached. Reducing the diversity by fifteen percent and solving for salinity results in a value of 12.15 ppt. Next, the location of peak salinity (8.0 ppt) under Block 1 flow (unadjusted) was determined to be 2.0 Rkm using the LSM regression. Holding this location and setting the salinity at this location to 12.15 ppt, the regression was solved for flow resulting in a reduced flow of 125 cfs. Recapping, a flow of 144 cfs (representing observed median block flows 9184-2004) results in a salinity of 8.0 ppt at Rkm 2.0, while a flow of 125 cfs results in a salinity of 12.15 at the same location. At salinity of 12.15, peak diversity is reduced by fifteen percent and the associated flow reduction is thirteen percent. 7.4 Application of Salinity Habitat Model Determination of the loss of volume (or bottom area) at a given salinity was determined sequentially according to the following steps using the LOC correlations. 1) Estimate location (Rkm) of desired isohaline under baseline flows. (Bottom isohalines and median block flows, adjusted for pumpage were used. Block 1 observed median for 1984-2004 = 144 cfs plus anthropogenic adjustment of 12.7 cfs.) Block 1 flow evaluated was 157 cfs. Block 3 flow evaluated was 175 cfs) 2) Estimate upstream volume (or area as appropriate) at the river location calculated in step 1 using volume vs. Rkm equation. (See Figure 3.3) 3) Reduce the upstream volume by fifteen percent. 4) Calculate the new location of the isohaline from volume vs. Rkm equation 5) Calculate the reduced flow that would result in the new location of the isohaline using the LOC correlation. The steps are graphically illustrated in Figure 7- 7 for Block 1 adjusted flows (144 cfs + 12.7 cfs adjustment) and the 2 ppt isohaline. This approach was repeated for all isohalines of interest and for both volume and bottom area. A fifteen percent loss was determined for each isohaline LOC equations presented in Table 4-7 and intermediate isohalines were interpolated from those results. For example, the Block 1 percent flow reduction for 14 ppt volume was 6.40 % and for 16 ppt volume the reduction was 5.60%. The 15 ppt volume reduction was interpolated as 6.01% ____________________________________________________________________________________________ Proposed Minimum Flows and Levels for Weeki Wachee River Technical Approach Page 108 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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Page 74 and 75: E) Salinity = β o + β 1 *Flow 2 +
Page 76 and 77: Additional exploratory attempts usi
Page 78 and 79: 86 = 186 cfs, SWFWMD 1994-96 = 167
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
Page 90 and 91: measured volume sampled which was t
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 124 and 125: Figure 7- 7 Estimation of Flow Redu
Page 126 and 127: Figure 7-8. Summary Results for the
Page 128 and 129: The reductions in flow that meet th
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
Page 140 and 141: The wavelet used is the symmlets wa
Page 142 and 143: explains, the energy plot shows the
Page 144 and 145: 0 if no significant withdrawal Z =
Page 146 and 147: One advantage of using this regress
Page 148 and 149: Technical Memorandum January 22, 20
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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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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