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

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Because minimum flows are intended to protect the water resources or ecology of an area, and because climatic variation can influence river flow regimes, we developed long-term compliance standard for the Alafia River gage site at Lithia. The standards are hydrologic statistics that represent flows that may be expected to occur during long-term periods when short term-compliance standards are being met. The long-term compliance standards were generated using gagespecific historic flow records, prescribed flow reductions for the three seasonal blocks and low flow threshold values. For the analyses, the entire flow record was altered by the maximum allowable flow reduction in accordance with the prescribed flow reductions and the low flow threshold. Hydrologic statistics for the resulting altered flow data set, including five and ten-year mean and median flows were calculated. These statistics integrate duration and return frequency components of the flow regime for long-term (five or ten-year) periods, and were used to establish the long-term compliance standards. For flows in the Alafia River at the USGS Lithia gage, long-term compliance standards were established at the minimum five and ten-year mean and median flows (Tables 5-6). Standards were developed for evaluating flows on an annual basis and for the seasonal blocks corresponding to periods of low (Block 1), medium (Block 2) and high (Block 3) flows. Because these long-term compliance standards were developed using the short-term compliance standards and the historic flow records, it may be expected that the long-term standards will be met if compliance with short-term standards is achieved. Collectively, the short and long-term compliance standards proposed for the USGS gage sites at Lithia comprise the District's proposed minimum flows and levels for the Alafia River. The standards are intended to prevent significant harm to the water resources or ecology of the river that may result from water use. Since future structural alterations could potentially affect surface water or groundwater flow characteristics within the watershed and additional information pertaining to minimum flows development may become available, the District is committed to revision of the proposed levels, as necessary. 5-26
Table 5-7. Proposed Minimum Flows for the Alafia River, including short-term and long-term compliance standards, for the Alafia River at the Lithia, FL USGS gage site. Period Effective Dates Short-Term Compliance Standards Flow on Previous Day Daily Flow Available for Consumptive Use Long-Term Compliance Standards Hydrologic Statistic Flow (cfs) Annually Block 1 Block 2 Block 3 January 1 to December 31 April 20 to June 24 October 28 to April 19 June 25 to October 27 59 cfs and 374 cfs 59 cfs and 66 cfs and 374 cfs 59 cfs and 69 cfs and 374 cfs 59 cfs and 64 cfs and 374 cfs 0% of flow Seasonally dependent 8% of flow 0% of flow Flow in excess of 59 cfs 10% of flow 8% of flow 0% of flow Flow in excess of 59 cfs 15% of flow 8% of flow 0% of flow Flow in excess of 59 cfs 13% of flow 8% of flow 10-Yr Mean 10-Yr Median 5-Yr Mean 5-Yr Median 10-Yr Mean 10-Yr Median 5-Yr Mean 5-Yr Median 10-Yr Mean 10-Yr Median 5-Yr Mean 5-Yr Median 10-Yr Mean 10-Yr Median 5-Yr Mean 5-Yr Median 192 101 163 86 85 35 53 27 137 82 110 66 318 179 276 163 5-27
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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
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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 and 168: Table 5-5. Maximum monthly percent-
Page 169: 5.8 Short-Term Compliance Standard
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
Page 219 and 220: 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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