Chapter 1 Minimum Flows and Levels - Southwest Florida Water ...

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Because climatic variation can influence river flow regimes, long-term compliance standards were also developed for the USGS Braden River near Lorraine, FL gage site. The standards are hydrologic statistics that represent flows expected to occur during long-term periods when short term-compliance standards are being met. The long-term compliance standards must be generated from flow records that are representative of a period devoid of significant anthropogenic impacts. Long-term compliance standards were developed using the entire Braden River near Lorraine flow record and the proposed short-term compliance standards for the river segment. For the analysis, daily gaged flow values were modified in accordance with the assumption that the maximum allowable withdrawals prescribed by the short-term compliance standards actually occurred. Hydrologic statistics for the modified flow data set, including five and ten-year mean and median annual and block-specific flows, were calculated and the lowest statistics for the respective time periods were established as the long-term compliance standards (Table 5-10). The standards integrate duration and return frequency components of the flow regime for long-term (five or ten-year) periods. Because the standards were developed using short-term compliance standards and the presumed 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 Braden River near Lorraine gage site comprise the District's proposed minimum flows and levels for the upper, freshwater segment of the Braden 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 5-10. Proposed Minimum Flows for the upper, freshwater segment of the Braden River, including short-term and long-term compliance standards for the USGS Braden River near Lorraine FL gage site. Period Effective Dates Short-Term Compliance Standards Flow on Previous Day Daily Flow Available for Proposed Use Long-Term Compliance Standards Hydrologic Statistic Flow (cfs) Annually Block 1 Block 2 Block 3 January 1 to December 31 May 7 to June 19 October 25 to May 6 June 20 to October 24 7 cfs >54 cfs 7 cfs 7 cfs >54 cfs 7 cfs and 54 cfs 0% of flow Seasonally dependent (see below) 0% of flow 10% of flow 0% of flow 11% of flow 10% of flow 0% of flow 19% of flow 10% 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 31 3 26 2 5 1 2 0 20 3 10 1 65 23 43 7 5-27
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Proposed Minimum Flows and Levels f
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Table of Contents TABLE OF CONTENTS
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5.5 PRESCRIBED FLOW REDUCTION FOR B
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Figure 2-19. Potassium concentratio
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Figure 5-13. Median daily flow at t
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mean feature elevations are listed
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For the high flow season of the yea
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Acknowledgements The authors would
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fluctuations in water flows or leve
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Common to this list and the flow re
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Fundamental to the approach used fo
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300 250 Block 1 Block 3 Block 2 Flo
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are outlined in Chapter 4. In Chapt
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as the freshwater segment upstream
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attributed to analytic precision di
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Figure 2-4. 1999 land use/cover map
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Table 2-2. Land use/cover and land
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Figure 2-8. 1999 Land use/cover map
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Figure 2-10. 1972 Land use/cover ma
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Smith and Stopp (1978) note that "i
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2.4.2.1 Multidecadal Periods of Hig
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2.4.3.2 Step Trend in River Flows K
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Table 2-4. Results of Kendall's tau
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2.4.4 Benchmark Periods Climate-bas
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Oscillation were examined. On a sea
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Water Chemistry 2.4.6 Water Quality
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Braden River near Lorraine, FL 0.6
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Peace River at Arcadia, FL 10 Potas
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Table 2-8. Summary statistics for B
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3.2 Resources and Area of Concern T
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Page 63 and 64: levels such as fish have been shown
Page 65 and 66: Figure 3-1. Example of low flow in
Page 67 and 68: USGS Braden River near Lorraine gag
Page 69 and 70: instream cross-sections were sample
Page 71 and 72: Figure 4-2. Upstream vegetation cro
Page 73 and 74: supports water surface profile calc
Page 75 and 76: The HEC-RAS model was run using 21
Page 77 and 78: Adult Spotted Sunfish Adults - Brad
Page 79 and 80: species of interest. For example cu
Page 81 and 82: 4.4 Seasonal Flow and Development o
Page 83 and 84: Wetted Perimeter - Sta. 44.9 25 20
Page 85 and 86: factors, the most conservative of w
Page 87 and 88: Chapter 5 Results and Recommended M
Page 89 and 90: Wetted Perimeter Requirements Flow
Page 91 and 92: 40 35 30 25 20 15 10 5 0 May June M
Page 93 and 94: Floodplain profiles and vegetation
Page 95 and 96: mean elevation of the Oak/popash ve
Page 97 and 98: Table 5-3. Mean (±SD) flows at the
Page 99 and 100: Elevaton (NGVD) 27.0 22.0 17.0 12.0
Page 101 and 102: Table 5-7. Median elevations, in fe
Page 103 and 104: 80 70 60 Flow reduction (%) 50 40 3
Page 105 and 106: Table 5-8. Recommended percent flow
Page 107 and 108: 100 90 80 % DOMINANCE 70 60 50 40 3
Page 109 and 110: Table 5-9. Mean elevation of instre
Page 111: The second standard was developed t
Page 115 and 116: Division Information and Technology
Page 117 and 118: Hupalo, R., C. Neubauer, L. Keenan,
Page 119 and 120: communities in the corridors of the
Page 121 and 122: Wharton, C.H., W.M. Kitchens, E.C.
Page 123 and 124: Confined Aquifer - A term used to d
Page 125 and 126: Instream Habitats - A specific type
Page 127 and 128: Riffle - A relatively shallow reach
Page 129 and 130: Chapter 8 Appendix A A Review of
Page 131 and 132: steps to reduce the uncertainty and
Page 133 and 134: 2007). In addition, the approach us
Page 135 and 136: with limited biological knowledge o
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Page 139 and 140: have now been developed and adopted
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Page 143 and 144: prevent negative effects associated
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Page 149 and 150: Summary, Special Publication SJ2002
Page 151 and 152: Errata / comments by page number in
Page 153 and 154: 4-20 Section 4.7.1, 1 st paragraph,
Page 155 and 156: Chapter 9 Appendix B - Staff Respon
Page 157 and 158: 2) The panel notes that the period
Page 159 and 160: 4) One aspect of Chapter 2 should b
Page 161 and 162: Preventing Significant Harm - 15% C
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they aren't getting enough particul
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Habitat Criteria and Characterizati
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Compliance Standards and Proposed M
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Glossary of Terms 13) When an inter
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