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

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5.4.2 Short-Term Compliance Standards for the Alafia River - Block 3 Short-Term Compliance Standards represent a flow prescription that can be utilized for evaluating minimum flows compliance on a short-term basis, for example, based on measured daily flows. During Block 3, which begins on June 25 and ends on October 27, the following Short-Term Compliance Standards apply: 1) All flows equal to or below 59 cfs measured at the USGS Alafia River at Lithia, FL gage are protected in their entirety; 2) All flows between 59 cfs and 64.2 cfs measured at the Lithia gage are available for use; and 3) A 13% reduction of all flows above 64.2 cfs and below 374 cfs measured at the Lithia gage is available for use; and 4) An 8% reduction of all flows above 374 cfs measured at the Lithia gage is available for use. The first standard was derived from the low flow threshold. The second and third standards were developed to permit compliance with the prescribed flow reductions for Block 3 without violation of the low flow thresholds. The fourth standard was developed through RALPH analysis to assure no greater than a 15% loss of days for a given flow being achieved. 5.5 Prescribed Flow Reduction for the Alafia River - Block 2 The Prescribed Flow Reduction for Block 2 (PFR2) was based on review of limiting factors developed using PHABSIM to model potential changes in habitat availability for several fish species and macroinvertebrate diversity, and use of RALPH analysis to specifically evaluate changes in inundation patterns of woody habitats. The prescribed flow reduction was established by calculating the percent-of-flow reduction which would result in no more than a 15% loss of habitat availability during Block 2 or no more than a 15% reduction in number of days of inundation of exposed root habitat, over the entire year, after prescribed flow reductions for Block 1 and Block 3 were applied. For the Alafia River, a 15% reduction in number of days of inundation of exposed root habitat, over the entire year, was the limiting factor and yielded a prescribed flow reduction for Block 2 of 19% of the flow at the Lithia gage site. 5-12
5.5.1 Application of PHABSIM for Block 2 PHABSIM analyses were used to model potential changes in habitat availability for several fish species and macroinvertebrate diversity during Block 2, which runs from October 28 through April 19. Results were evaluated for two locations in the Alafia River near SWFWMD cross-section locations 27 and 64. The reductions in historic flow greater than about 34% resulted in more than a 15% loss of available habitat for largemouth bass adults (Figure 5-9). This percent-offlow reduction was considered for use in the development of a prescribed flow reduction for Block 2 at the Lithia gage site. Predicted Habitat Gain/Loss for Laregemouth Bass Adults Based on Historic Flow Conditions (1970-1999) being reduced by 10, 20, 30, and 40 percent at Alafia River Site 64 10% 5% February March 0% January December Habitat Gain/Loss -5% -10% -15% November 10% Flow Reduction 20% Flow Reduction 30% Flow Reduction 40% Flow Reduction -20% October -25% Figure 5-9. Predicted habitat gain/loss for adult large mouthbass based on the flow record from 1970 to 1999 and flow reductions of 10, 20, 30, and 40 percent. 5.5.2 Instream Habitats Bottom habitats, including sand, mud and bedrock, were dominant, based on the linear extent of the habitat along the cross-sections (Figure 5-10). Wetland tree habitat was also abundant. Exposed roots, snags and wetland plants comprised substantially less of the linear habitat. Relative elevations of the habitats were consistent among the cross-sections (Figure 5-11). Wetland trees were typically situated near the top of the banks with wetland plants and exposed roots occurring at slightly lower elevations. Snags were found in association with the bottom habitats. The occurrence of exposed roots at relatively high elevations is important because inundation of this habitat results in inundation of habitats located at lower elevations. 5-13
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Alafia River Minimum Flows and Leve
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Table of Contents Table of Contents
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4.3.1 HEC-RAS Modeling ............
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Table of Figures Figure 1-1. Buildi
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Figure 2-33. Phosphorus concentrati
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Figure 5-12. Habitat Gain/Loss for
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Table 5-2. Mean elevation, local (c
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flow, with the exception that withd
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Acknowledgement The authors would l
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9) Water quality; and 10) Navigatio
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Water Management District typically
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Peace River at Zolfo Springs, FL. s
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Period of Record Median Daily Flows
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to enhance understanding of histori
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River watershed, to the east by the
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an adjacent area locally known as t
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Water in the surficial aquifer is r
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The Upper Floridan aquifer (UFA) sy
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Figure 2-4. May and September 2001
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head differences indicating breache
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data (multiple regression) analyses
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2.2 Land Use Changes in the Alafia
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Before discussing individual sub-ba
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Table 2-2. Land use and land cover
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Table 2-3. Land use and land cover
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Figure 2-13. 1972 and 1999 Land use
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2.2.4 Lithia Springs Sub-Basin The
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2.3 Hydrology The assessment of min
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occurred during the spring were sim
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Conversely, since most of the Unite
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extending from 1940 to 1969 can be
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third highest flow occurred early i
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Flow (cfs) Alafia River at Lithia,
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100 North Prong Alafia River at Key
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Flow (cfs) South Prong Alafia River
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Alafia River at Lithia - Water Qual
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South Prong Watershed Above USGS Ga
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Comparisons of land use changes and
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Comparison of Median Daily Flows fo
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Comparisons of Annual 25% Exceedanc
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Figure 2-25. Lithia Springs Major b
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2.3.4.3.2 Discharge from Lithia Spr
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Relationship Between Lithia Springs
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Buckhorn Spring Main Discharge (Wit
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versus flow. The third plot typical
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Alafia River at Lithia, FL Phosphor
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While elevated phosphorus concentra
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Peace River at Arcadia, FL 20 Phosp
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Alafia River at Lithia, FL Nitrate/
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2.4.2 Potassium and Trend Analysis
Page 105 and 106: Alafia River at Lithia, FL 14 Potas
Page 107 and 108: Table 2-10. Results of Kendall's ta
Page 109 and 110: Chapter 3 Ecological Resources of C
Page 111 and 112: 1) maintenance of minimum water dep
Page 113 and 114: flow regimes and these life history
Page 115 and 116: subsidy of water and nutrients that
Page 117 and 118: Chapter 4 Technical Approach for Es
Page 119 and 120: 4.2.1 HEC-RAS Cross-Sections Cross
Page 121 and 122: PHABSIM analysis required acquisiti
Page 123 and 124: Figure 4-5. Upstream vegetation cro
Page 125 and 126: level, whenever possible. Immature
Page 127 and 128: major parameter altered during the
Page 129 and 130: Alafia River - Cross Section 64 - W
Page 131 and 132: Delphi method lacks the rapid feedb
Page 133 and 134: TOTAL DAYS OF INUNDATION DURING THE
Page 135 and 136: Period of Record Median Daily Flows
Page 137 and 138: Wetted Perimeter - USGS 84.5 - SWFW
Page 139 and 140: Alafia River Station 91.5 Stage in
Page 141 and 142: section sites and corresponding flo
Page 143 and 144: 4.9.1.2 Recreational Use Assessment
Page 145 and 146: Chapter 5 Results and Recommended M
Page 147 and 148: greater than 25 cfs would inundate
Page 149 and 150: For the USGS Lithia gage site, the
Page 151 and 152: 40 35 30 25 20 15 10 T20 T21 T27 T3
Page 153 and 154: Wetted Perimeter (linear feet) 2000
Page 155: dominant vegetation zones, mucky so
Page 159 and 160: 5.5.3 Flow Relationships with Woody
Page 161 and 162: River begins on October 28 and ends
Page 163 and 164: Table 5-4. Maximum monthly percent-
Page 165 and 166: 5.6.3 Short-Term Compliance Standar
Page 167 and 168: Table 5-5. Maximum monthly percent-
Page 169 and 170: 5.8 Short-Term Compliance Standard
Page 171 and 172: Table 5-7. Proposed Minimum Flows f
Page 173 and 174: Biological Services Program Report
Page 175 and 176: Jones, G.W., and Upchurch, S.B., 19
Page 177 and 178: SDI Environmental Services, Inc. 20
Page 179 and 180: Upchurch, S.B. and J.R. Littlefield
Page 181 and 182: A Review of “Alafia River Minimum
Page 183 and 184: The draft report for setting MFLs f
Page 185 and 186: methodologies, analyses, and conclu
Page 187 and 188: The SWFWMD has employed a building
Page 189 and 190: MFLs for the Alafia and Myakka rive
Page 191 and 192: RALPH PLOTS AND ANALYSES Recent and
Page 193 and 194: then used to estimate percent of fl
Page 195 and 196: necessary. Such a framework should
Page 197 and 198: to use to meet the criteria of no s
Page 199 and 200: Shaw, D.T., C.N. Dahm, and S.W. Gol
Page 201 and 202: The District has added to Chapter 4
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Attachment A June 15 th , 2005 Mrs.
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The Kelly (2004) report includes a
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Figure 1. Box-and-whisker plots of
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As shown in Table 1, a nonparametri
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“augmentation” - be performed a
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Estuary Program 'Restoring the Bala
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APPENDIX D - District's response to
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educed by no more than 8 percent on
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sites with comparable temporal reco
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gradually removed (this appears as
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1) The DISTRICT acknowledges the ma
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Mark Hammond, Director, Resource Ma
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Table 1. Mann-Whitney Statistical A
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Comparison of July Rainfall Totals
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