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

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30 25 Mean Habitat Elevation (ft NGVD) 20 15 10 5 0 Wetland Trees Wetland Plants Exposed Roots Snags Bottom Substrates -5 15.00 14.00 USGS @ Lorraine 13.00 12.00 11.00 USGS near Lorraine Distance from Mouth of River (miles) 10.00 9.00 Linger Lodge Figure 5-12. Mean elevations of instream habitats at fourteen cross-section sites on the Braden River. 5.5.3 Flow Relationships with Woody Instream Habitats Based on the ecological importance of woody habitat, and its potential for use in development of a medium-flow standard, inundation patterns were examined for exposed root and snag habitats at fourteen Braden River instream habitat crosssections (Table 5-9). Based on HEC-RAS output, flows at the USGS Braden River near Lorraine gage that are sufficient for inundation of the mean elevation of exposed root habitat at the fourteen sites ranged from 26 to 315 cfs with a mean of 113 cfs. Snag habitat was observed at twelve of the cross-section sites, but flows required for inundation of mean snag elevation were estimated for only ten of the sites because the habitats occurred at two sites at elevations associated with flows that were lower than those modeled with HEC-RAS. Based on data for ten cross-section sites, flows at the Braden River near Lorraine gage ranging from 7 to 102 cfs, with a mean of 29 cfs, were sufficient for inundation of snag habitats. 5-22
Table 5-9. Mean elevation of instream woody habitats (exposed roots and snags) at fourteen instream habitat cross-section sites, corresponding flows at the USGS Braden River near Lorraine gage site required for inundation of the mean elevations, and maximum percent-of-flow reductions associated with less than a 15% reduction in the number of days flow sufficient to inundate the mean habitat elevations for two benchmark periods.. Habitat Site Mean Elevation (ft NAVD88) Flow at Gage (cfs) Required for Inundation Percent -of- Flow Reduction 1988-1994 Percent -of- Flow Reduction 1995-2005 Exposed Root 1 22.8 88 16 15 Exposed Root 2 21.8 90 15 15 Exposed Root 3 20.1 62 18 13 Exposed Root 4 18.7 80 13 14 Exposed Root 5 18.6 164 10 14 Exposed Root 6 15.7 65 15 16 Exposed Root 7 15.7 76 11 11 Exposed Root 8 10.6 84 14 14 Exposed Root 9 8 44 13 17 Exposed Root 10 5.6 26 10 13 Exposed Root 12 6.4 315 7 11 Exposed Root 13 4.1 203 19 21 Exposed Root 14 3.1 58 17 14 Exposed Root 15 3.5 233 10 27 Mean 113 16 20 a Snag 1 19.4 11 8 15 Snag 2 19 14 12 17 Snag 3 19.2 35 16 16 Snag 4 15.6 7 50 50 Snag 5 14.7 14 12 17 Snag 6 16.6 102 17 16 Snag 7 11.9 19 13 17 Snag 8 8.6 38 13 5 Snag 9 7.1 25 13 13 Snag 10 5.1 22 18 15 Snag 13 2.3 NA a Snag 14 2.2 NA a Mean 29 12 17 NA = not available; flows required to inundate the habitat were below modeled flows. 5-23
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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
Page 57 and 58: Table 2-8. Summary statistics for B
Page 59 and 60: 3.2 Resources and Area of Concern T
Page 61 and 62: habitat, the greater area of stream
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
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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
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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: 100 90 80 % DOMINANCE 70 60 50 40 3
Page 111 and 112: The second standard was developed t
Page 113 and 114: Table 5-10. Proposed Minimum Flows
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
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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
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Page 155 and 156: Chapter 9 Appendix B - Staff Respon
Page 157 and 158: 2) The panel notes that the period
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4) One aspect of Chapter 2 should b
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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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