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

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4.4 Seasonal Flow and Development of Blocks 1, 2, and 3 for the Alafia River and Other District Rivers For most rivers in the SWFWMD, there is a repetitive annual flow regime that can be described on the basis of three periods. These three periods are characterized by low, medium, and high flows and for the purpose of developing minimum flows and levels, are termed Block 1, Block 2, and Block 3, respectively. To determine when these blocks may be expected to occur, flow records for several regional rivers were evaluated. For this analysis, flow records for long-term gage sites including the Alafia River at Lithia, the Hillsborough River at Zephyrhills, the Myakka River near Sarasota, the Peace River at Arcadia, and the Withlacoochee River at Croom were reviewed. The mean annual 75 and 50 percent exceedance flows and average median daily flows for two time periods (1940 to 1969 and 1970 to 1999) were determined. Records from the two time periods were reviewed to evaluate potential effects of Atlantic Multidecadal Oscillation phases on river flows. The low flow period, Block 1, was defined as beginning when the average median daily flow for a given time period fell below and stayed below the annual 75% exceedance flow. Block 1 was defined as ending when the high flow period, or Block 3, began. Block 3 was defined as beginning when the mean median daily flow exceeded and stayed above the mean annual 50% exceedance flow and ending when the flow fell below the 50% exceedance. The medium flow period, Block 2, was defined as extending from the end of Block 3 to the beginning of Block 1 (Figure 4-10). With the exception of the gage site on the Withlacoochee River, there was little difference in the dates that each defined period began and ended, irrespective of the time period evaluated (Table 4-1). For the Alafia, Hillsborough, Myakka, and Peace Rivers, Block 1 was defined as beginning on Julian day 110 (April 20 on non-leap years) and ending on Julian day 176 (June 25). Block 3 was defined as beginning on Julian day 177 (June 26) and ending on Julian day 299 (October 26). Block 2, the medium flow period, extends form Julian day 300 (October 27) to Julian day 109 (April 19) of the following calendar year. Using these definitions: Blocks 1, 2, and 3 are 66, 175 and 123 days in length, respectively (Table 4-2). Blocks 1 and 3 began approximately 20-30 days later at the Withlacoochee River gage site; it will be necessary to generate a separate set of flow blocks for establishing minimum flows for the Withlacoochee River. 4-18
Period of Record Median Daily Flows for Alafia River at Lithia, FL Flow (cfs) 600 500 400 300 200 100 0 B B B L L L O O O B C C C L K K K O 2 1 2 C K 3 0 50 100 150 200 250 300 350 Day of Year (Julian Date) Figure 4-10. Approximate representations of flow blocks (Blocks 1, 2 and 3) projected onto a plot of median daily flows (Julian day) recorded between 1970 and 1999 at the USGS Lithia Gage at the Alafia River. Table 4-1. Beginning Julian Dates for the Wet and Dry periods (Blocks 1 and 3) and ending Date for the Wet period at five different gage stations in the SWFWMD. Begin Dry (Block 1) Begin Wet (Block 3) End Wet (Block 3) Alafia at Lithia 106 175 296 Hillsborough at 112 176 296 Zephyrhills Myakka at Sarasota 115 181 306 Peace at Arcadia 110 174 299 Withlacoochee at Croom 130 208 306 Mean w/o 110 177 300 Withlacoochee Mean with Withlacoochee 114 183 301 4-19
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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
Page 83 and 84: Comparisons of Annual 25% Exceedanc
Page 85 and 86: Figure 2-25. Lithia Springs Major b
Page 87 and 88: 2.3.4.3.2 Discharge from Lithia Spr
Page 89 and 90: Relationship Between Lithia Springs
Page 91 and 92: Buckhorn Spring Main Discharge (Wit
Page 93 and 94: 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: TOTAL DAYS OF INUNDATION DURING THE
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 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
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methodologies, analyses, and conclu
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The SWFWMD has employed a building
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MFLs for the Alafia and Myakka rive
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RALPH PLOTS AND ANALYSES Recent and
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then used to estimate percent of fl
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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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