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

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Wetted Perimeter 10) Given that this method [identification of the lowest wetted perimeter inflection point for establishing a low flow threshold] should only be applied in shallows, riffles or ledges, it is not clear why the authors choose to establish the “…wetted perimeter inflection point at the lowest modeled flow.” Perhaps, it would be better to simply eliminate these transects from the analysis since transects through pools should not be used. Staff agree with this comment and actually use only the results from shallow areas for determination of low flow thresholds. Deep pools which have inflection points established below or at the lowest modeled flow are ignored when evaluating the lowest wetted perimeter inflection point. Clearly it would be inappropriate to do otherwise. Staff do however report this data for completeness, and view it as similar to a chemistry lab reporting below detection limits as the detection limit or Secchi disk depth which hits the bottom as being recorded as bottom depth. 9-12
Compliance Standards and Proposed Minimum Flows 11) The Panel notes that flow-duration curves, the common currency of hydrologists, are a useful way to present information of this type and may be beneficial to the reader in that the full range of flows that can occur in any given time step can be seen. Staff agrees that flow duration curves are effective for conveying hydrologic information. However, staff believes that the median annual flow hydrographs presented in District MFLs reports are easily understood by both experts and laypersons and that they are appropriate for comparing potential hydrologic regimes associated with the proposed minimum flows with historic or natural flows. Staff will consider the inclusion of flow-duration curves in future MFLs reports as an addition to the currently used hydrographs. 9-13
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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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habitat, the greater area of stream
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levels such as fish have been shown
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Figure 3-1. Example of low flow in
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USGS Braden River near Lorraine gag
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instream cross-sections were sample
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Figure 4-2. Upstream vegetation cro
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supports water surface profile calc
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The HEC-RAS model was run using 21
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Adult Spotted Sunfish Adults - Brad
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species of interest. For example cu
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4.4 Seasonal Flow and Development o
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Wetted Perimeter - Sta. 44.9 25 20
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factors, the most conservative of w
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Chapter 5 Results and Recommended M
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Wetted Perimeter Requirements Flow
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40 35 30 25 20 15 10 5 0 May June M
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Floodplain profiles and vegetation
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mean elevation of the Oak/popash ve
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Table 5-3. Mean (±SD) flows at the
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Elevaton (NGVD) 27.0 22.0 17.0 12.0
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Table 5-7. Median elevations, in fe
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80 70 60 Flow reduction (%) 50 40 3
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Table 5-8. Recommended percent flow
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100 90 80 % DOMINANCE 70 60 50 40 3
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Table 5-9. Mean elevation of instre
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The second standard was developed t
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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
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Page 125 and 126: Instream Habitats - A specific type
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Page 129 and 130: Chapter 8 Appendix A A Review of
Page 131 and 132: steps to reduce the uncertainty and
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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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Page 161 and 162: Preventing Significant Harm - 15% C
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Page 165: Habitat Criteria and Characterizati
Page 169 and 170: Glossary of Terms 13) When an inter
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