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

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5.3 Prescribed Flow Reduction for Block 1 A prescribed 10% flow reduction for Block 1 at the Braden River near Lorraine gage site was developed based on review of limiting factors established using PHABSIM to model potential changes in habitat availability for several fish species and macroinvertebrate diversity at two representative sites. 5.3.1 PHABSIM Results for Block 1 Physical Habitat Simulation analyses were conducted for two representative sites on the Braden River. The "upper" site was located downstream of the Braden River near Lorraine gage, and the "lower" site was located approximately one mile upstream from the Linger Lodge gage. For both sites, the Braden River near Lorraine flow record was utilized in the PHABSIM time-series analyses, The record was split into two benchmark time periods, 1988 through 1994 and 1995 through 2005, based on Atlantic Multidecadal Oscillation cycle changes. Based on flow records from both benchmark periods, Block 1 flow reductions that would not be expected to result in more than a 15% reduction in available habitat were identified for 14 and 4 species/life history stages at the upper site for May and June, respectively (Figure 5-3), Analyses for the lower site identified a total of 7 and 2 species/life history stages that would be expected to be associated with a 15% reduction in available habitat in May and June, respectively (Figure 5- 4). For both sites, flow reductions that would not reduce available habitat by more than 15% were most restrictive for spotted sunfish (adult and spawning classes) in May, when 10% flow reductions were identified (Figure 5-4). Only a few species/life stages of concern were identified for June, with lowest flow restrictions of 28 and 18 cfs identified for the 1988 through 1994 and 1995 through 2005 time periods for the two sites, respectively (Figures 5-3 and 5-4). Based on these results, May is the most restrictive month in Block 1. This is not surprising, given that May is typically the month when lowest streamflows occur. The proposed PHABSIM Block 1 percent-of flow reduction standard of 10%, was derived by averaging the allowable percent flow reductions identified for May for the two study sites. Table 5-1. Recommended percent flow reductions based on PHABSIM analyses for two sites in the Braden River for the two month included in Block 1. Site May June Upper 10 28 Lower 10 18 5-4
40 35 30 25 20 15 10 5 0 May June Mean 23 31 Minimum 10 28 Maximum 32 36 N 14 4 Figure 5-3. Summary results for the "upper" Braden River PHABSIM site for May and June. Descriptive statistics (N, mean, minimum and maximum) for percent-of-flow reductions associated with a 15% reduction in available habitat for selected biota are shown, based on review of ten, twenty, thirty and forty percent reductions in flows measured at the Braden River near Lorraine gage for two time periods (1988 through 1994 and 1995 through 2005). 40 Percent Flow Reduction 35 30 25 20 15 10 5 0 May June Mean 22 24 Minimum 10 18 Maximum 34 30 N 7 2 Figure 5-4. Summary results for the "lower" Braden River PHABSIM site for May and June. Descriptive statistics (N, mean, minimum and maximum) for percent-of-flow reductions associated with a 15% reduction in available habitat for selected biota are shown, based on review of ten, twenty, thirty and forty percent reductions in flows measured at the 5-5
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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
Page 39 and 40: Smith and Stopp (1978) note that "i
Page 41 and 42: 2.4.2.1 Multidecadal Periods of Hig
Page 43 and 44: 2.4.3.2 Step Trend in River Flows K
Page 45 and 46: Table 2-4. Results of Kendall's tau
Page 47 and 48: 2.4.4 Benchmark Periods Climate-bas
Page 49 and 50: Oscillation were examined. On a sea
Page 51 and 52: Water Chemistry 2.4.6 Water Quality
Page 53 and 54: Braden River near Lorraine, FL 0.6
Page 55 and 56: 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
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: Wetted Perimeter Requirements Flow
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 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
Page 135 and 136: with limited biological knowledge o
Page 137 and 138: the other factors listed above or w
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An example of the primary output fr
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prevent negative effects associated
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methods, such as LiDAR, to improve
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habitat reduction criterion and the
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Summary, Special Publication SJ2002
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Errata / comments by page number in
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4-20 Section 4.7.1, 1 st paragraph,
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Chapter 9 Appendix B - Staff Respon
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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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