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

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Predicted Habitat Gain/Loss for Laregemouth Bass Fry Based on Historic Flow Conditions (1970-1999) being reduced by 10, 20, 30, and 40 percent at Alafia River Site 27 25% 20% 15% Habitat Gain/Loss 10% 5% 0% -5% 10% Flow Reduction 20% Flow Reduction 30% Flow Reduction 40% Flow Reduction -10% -15% -20% Figure 4-7 Example of a plot of habitat gain/loss relative to flow reductions of 10, 20, 30, and 40%. Data were obtained from time series analysis and the flow reductions are relative to the historic flows recorded at the USGS Lithia Gage site from 1970-1999. 4.3.2.1 Development of Habitat Suitability Curves Habitat suitability criteria used in the PHABSIM model include continuous variable or univariate curves designed to encompass the entire range of suitable conditions for water depth, water velocity, and substrate/cover type and proximity. There are three types of suitability curves. Type I curves do not depend upon acquisition of additional field-data but depend, instead upon personal experience and professional opinion. Informal development of Type I curves typically involves a roundtable discussion (Scheele 1975); stakeholders and experts meet to discuss habitat suitability information to be used for prediction of habitat availability for specific target organisms. A more formal process, know as the Delphi method (Zuboy 1981) involves submission of a questionnaire to a large respondent group of experts. Results from this survey process are summarized by presenting a median and interquartile range for each variable. Several iterations of this process must be used in order to stabilize the responses, each expert being asked to justify why his/her answer may be outside the median or interquartile range when presented the results of the data. The 4-14
Delphi method lacks the rapid feedback of a roundtable discussion, but does remove the potential biases of a roundtable discussion by creating anonymity of expert opinion. The Delphi method does assume that experts are familiar with the creation of habitat suitability criteria and can respond with sufficient detail to allow development of appropriate mathematical models of habitat use. Type II curves are based upon frequency distributions for use of a certain variables (e.g., flow), which are measured at locations used by the target species. Curves for numerous species have been published by the U.S. Fish and Wildlife Service or the U.S. Geological Survey and are commonly referred to as the “blue book” criteria. Type III curves are derived from direct observation of the utilization and/or preference of target organisms for a range of environmental variables (Manly et al. 1993). These curves are weighted by actual distribution of available environmental conditions in the stream (Bovee et al. 1998). Type III curves assume that the optimal conditions will be “preferred” over all others if individuals are presented equal proportions of less favorable conditions (Johnson 1980). In attempting to determine species dominance in the Alafia River fish community composition and abundance were assessed in three prominent habitats (submersed root wads, snag habitats and bare sand/bedrock). Results yielded a total of 15 fish species during January and March of 2004. A total of 8-12 fish species were collected from root wad and snag habitats on both sampling dates, and only 1-2 species were collected from bare sand/bedrock habitats. No rare, threatened or endangered species were observed. Based on electrofishing catch rates (CPM=catch per minute), redbreast sunfish, spotted sunfish L. punctatus, coastal shiner Notropis petersoni, and sailfin shiner Pteronotropis hypselopterus were the most abundant fish taxa in both exposed roots and woody debris (snag) habitats (see Appendix IH). Diet analysis conducted for redbreast sunfish Lepomis auritus collected from the overhanging root wad and woody debris habitats indicated that chironomid larvae and pupae comprised 50-100% of the fishes forage items. Invertebrate community structure in the Alafia River, Buckhorn Creek and the Lithia Springs reveals that snag habitats support relatively high numbers of invertebrate taxa, further emphasizing the importance of these habitats for the river ecosystem. Invertebrate assemblages in the river and spring runs were similar; no rare, threatened or endangered species were observed (see Appendix IH). Based on dominance of the spotted sunfish (Lepomis punctatus) in the Alafia River and other regional rivers, a habitat suitability curve was created for this species. Since most of the regional experts in fish ecology were unfamiliar with development of habitat suitability criteria, we chose to use a hybrid of the roundtable and Delphi techniques to develop a Type I curve. For this effort, a proposed working model of habitat suitability criteria was provided to fourteen 4-15
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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
Page 79 and 80: Comparisons of land use changes and
Page 81 and 82: 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: Alafia River - Cross Section 64 - W
Page 133 and 134: TOTAL DAYS OF INUNDATION DURING THE
Page 135 and 136: Period of Record Median Daily Flows
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
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A Review of “Alafia River Minimum
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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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