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

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Largemouth Bass Adults evaluated for Buckhorn Creek flows 0% Jan Feb March April May June July Aug Sep Oct Nov Dec -10% -20% -30% Habitat Gain/Loss -40% -50% 5 % Flow Reduction 10% Flow Reduction 20% Flow Reduction 30% Flow Reduction 40% Flow Reduction -60% -70% -80% -90% Figure 5-14. Habitat Gain/Loss for adult largemouth bass associated with modeled flow reductions of 10-40% in Buckhorn Creek, based on Buckhorn Creek flows, downstream of Buckhorn Springs Main. Similar plots for other largemouth bass life history stages and other species are included in Appendix PHABSIM. Table 5-6. Maximum monthly percent-of-flow reductions associated with less than a 15% reduction in habitat for various life history stages or activities of several fish species in Buckhorn Creek, based on Buckhorn Creek Flows, downstream from Buckhorn Springs Main. Month Percent-Of- Fish Species Life History Stage or Activity Flow Reduction January 10% Juvenile Spotted Sunfish, Adult Largemouth Bass February 10% Juvenile Spotted Sunfish, Adult Largemouth Bass March 20% Adult, Juvenile Spotted Sunfish, Adult Largemouth Bass April 10% Juvenile Spotted Sunfish, Adult Largemouth Bass May 10% Juvenile Spotted Sunfish, Adult Largemouth Bass June 10% Juvenile Spotted Sunfish, Adult Largemouth Bass July 5% Juvenile Spotted Sunfish, Adult Largemouth Bass August 5% Juvenile Spotted Sunfish, Adult Largemouth Bass September 5% Juvenile Spotted Sunfish, Adult Largemouth Bass October 5% Juvenile Spotted Sunfish, Adult Largemouth Bass November 10% Juvenile Spotted Sunfish, Adult Largemouth Bass December 10% Juvenile Spotted Sunfish, Adult Largemouth Bass 5-24
5.8 Short-Term Compliance Standard for Buckhorn Springs Main For the Buckhorn Creek/Buckhorn Springs Main system, PHABSIM analyses yielded a prescribed flow reduction of 15% for all months when run using Buckhorn Spring flow data, corrected for withdrawals. When using Buckhorn Creek flow data, corrected for withdrawals, the prescribed flow reduction was 5% for July through October, and 10% for the rest of the year except March when a 20% reduction is appropriate. Buckhorn Spring Main accounts for a clear majority of the flow in Buckhorn Creek a large majority of the time. Both flow records generate answers that are similar. A 15% reduction in spring flow compared to a 10% reduction in creek flow does not differ greatly. Minimum flow requirements for the estuarine portion of the Alafia River are currently being evaluated by the District. Because compliance with minimum flows and levels for the estuary may be contingent on flow or discharge from Buckhorn Spring, we recommend that establishment of a minimum flow for the spring be deferred until analyses for the estuarine segment of the Alafia River are completed. The report for the estuarine portion of the Alafia River will include recommendations for minimum flows for Buckhorn Spring and will consider the PHABSIM analysis already performed. 5.9 Compliance Standards and Proposed Minimum Flows for the Freshwater Segment of the Alafia River We have developed short-term compliance standards that comprise a flow prescription for preventing significant harm to the Alafia River. Compliance standards were developed for three blocks that represent periods of low (Block 1), medium (Block 2) and high (Block 3) flows at two USGS Alafia River, FL gage sites (Tables 5-6). During Block 1, which runs from April 20 to June 24, the allowable withdrawal from the Alafia River that may be withdrawn for consumptive-use is 10% of the daily flow as measured at the USGS Lithia gage, once flows exceed 66 cfs. During Block 1, it is also proposed that no withdrawals be allowed when flows at the Lithia gage are below 59 cfs and that withdrawals when flows at the site are between 59 and 66 cfs not be allowed to lower the flow below 59 cfs. During Block 2, which extends from October 28 of one year to April 19 of the next, withdrawals of up to 15% of the daily flow at the Lithia gage may be allowed, with the exception that withdrawals should not be allowed to reduce the flow to less than 59 cfs. During Block 3, which extends from June 25 to October 27, withdrawals should be limited to a stepped flow reduction of 13% and 8% of flows, with the step from 13% to 8% occuring at 374 cfs at the Lithia gage. Proposed Block 3 reduction also must comply with the low flow threshold and assure that withdrawals not reduce the flow to less than 59 cfs at the Lithia gage. 5-25
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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
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Alafia River at Lithia, FL 14 Potas
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Table 2-10. Results of Kendall's ta
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Chapter 3 Ecological Resources of C
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1) maintenance of minimum water dep
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flow regimes and these life history
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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 and 156: dominant vegetation zones, mucky so
Page 157 and 158: 5.5.1 Application of PHABSIM for Bl
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: Table 5-5. Maximum monthly percent-
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
Page 207 and 208: Attachment A June 15 th , 2005 Mrs.
Page 209 and 210: The Kelly (2004) report includes a
Page 211 and 212: Figure 1. Box-and-whisker plots of
Page 213 and 214: As shown in Table 1, a nonparametri
Page 215 and 216: “augmentation” - be performed a
Page 217 and 218: 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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