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

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espect to corresponding flows at the USGS Lithia gage (cross-section #60). Cross-section 90.5 (Shoal #1) was found to be the limiting site, with a flow of 59 cfs at the USGS Lithia gage required for meeting the fish passage criterion. A flow of 59 cfs at the USGS Lithia gage was therefore used to define the fish passage standard for the Alafia River corridor. The standard flow is sufficient to maintain constant flow in the river and would minimize problems such as low dissolved oxygen levels that may be associated with low flow or stagnant conditions. FISH PASSAGE REQUIREMENTS Local flow (cfs) vs River Station Number (red line is required flow at the Lithis Gage) Local Flow (cfs) 70 60 50 40 30 20 10 0 47.14 cfs @ site 79 requires 54.51 cfs at site 41.75 cfs @ site 90.5 requires 58.6 cfs at site 60 (red line) 60 70 80 90 100 HEC-RAS Cross Section 39.1 cfs @ site 95.6 requires 55.6 cfs at site 60 Figure 5-1. Plot of local flow required to inundate the deepest part of the channel at each HEC-RAS cross-section to a depth of 0.6 ft. A local flow of 41.75 cfs at the limiting site (cross-section 60) is the equivalent of 59 cfs at the Lithia gage. 5.2.2 Wetted Perimeter Standard Wetted perimeter plots (wetted perimeter versus local flow) and the lowest wetted perimeter inflection point (LWPIP) were developed for each HEC-RAS cross-section based on all modeled flow runs (see Appendix WP for all plots). Flows necessary to inundate the LWPIP at each cross-section are shown in Figure 5-2. Inspection of the LWPIP flows indicated that a local flow equal to or 5-2
greater than 25 cfs would inundate the LWPIP at all cross sections included in the HEC-RAS channel model. Review of flows at the USGS Lithia gage, which correspond to the local flows/stages, indicated that a flow of 29 cfs at the gage site would be sufficient to inundate the LWPIP at all sampled cross-sections. The wetted perimeter standard for the Alafia River corridor was therefore established at 29 cfs at the USGS Lithia gage. Lowest Wettest Perimeter Inflection Point Local Flow (cfs) 35 30 25 20 15 10 5 0 60 70 80 90 100 HEC-RAS Cross Section Figure 5-2. Plot of local flow required to inundate the lowest wetted perimeter inflection point at each HEC-RAS cross-section. 5.2.3 Low Flow Threshold A low flow threshold of 59 cfs at the USGS Lithia gage was established for the Alafia River. The low flow threshold was established at the higher of the fish passage and wetted perimeter standards and is therefore expected to provide protection for ecological and cultural values associated with both standards. Although flows in the river may be expected to drop below the low flow threshold naturally, the threshold is defined to be a flow that serves as a limit to withdrawals, with no withdrawals permitted from the river unless the low flow threshold is exceeded. 5-3
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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
Page 95 and 96: Alafia River at Lithia, FL Phosphor
Page 97 and 98: While elevated phosphorus concentra
Page 99 and 100: Peace River at Arcadia, FL 20 Phosp
Page 101 and 102: Alafia River at Lithia, FL Nitrate/
Page 103 and 104: 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: Chapter 5 Results and Recommended M
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 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
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to use to meet the criteria of no s
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Shaw, D.T., C.N. Dahm, and S.W. Gol
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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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