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

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Figure 2-22. Graphical results of Kendall’s tau test for trend in mean annual flows for the South Prong of the Alafia River for the period 1970 to 1999. Both the OLS and Thiel best fit lines are shown. The slope of the Thiel line is -0.1918 with a p value of 0.8028. 2-51
Comparisons of land use changes and flows in the North and South Prongs of the Alafia River provides an additional means for evaluating the impact of mining on flow in the Alafia River. Although not as extensive as in the South Prong, phosphate mining has also occurred in this sub-basin (see Table 2-8). Between 1972 and 1999, nineteen percent (19%) of the North Prong watershed was mined; during this same time 63% of the South Prong watershed was mined. Using the logic applied by SDI (2003), one would expect to see a substantially greater reduction in flow in the South Prong due to mining than the reduction that would have occurred in the North Prong since the amount of watershed mined was more than three times greater. Table 2-8. Percent of area mined above three USGS gages in the Alafia River watershed. Percent of Watershed Mined Year North Prong South Prong Lithia minus NP&SP 1972 16 10 10 1990 34 63 16 1999 35 72 18 Increase (1972 to 1999) 19 62 8 Area (sq miles) 135 107 93 Note: USGS lists area above South Prong gage as 107 sq miles; SWFWMD determined the area based on 1999 landuse map to be 112 sq miles Inspection of percent exceedance flows and comparison of decadal flow plots for these two sub-basins suggest that mine-related discharges were greater in the North Prong than the South Prong; however, water quality and flow data suggest that low flows were increased in both systems. Percent exceedance flow plots indicate similar temporal declines in mine-related discharges in both systems; flow data indicate that mine related discharges were essentially eliminated from both the North and South Prongs by the late 1970s or early 1980s. Decadal by decadal comparisons of flow between the two sub-basins (Figure 2-23 verifies that both sub-basins have discharged remarkably similar flows (cfs/square mile) over the last several decades. These flows are essentially identical despite the fact that more than three times the area has been mined in the South Prong as in the North Prong. If flows decline as percent of mined area increases, one would expect to see monotonic flow declines in both sub-basin watersheds, and one would also expect to see a much greater rate of decline in South Prong flows relative to North Prong flows. The logic in selecting the South Prong as a good 2-52
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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
Page 27 and 28: to enhance understanding of histori
Page 29 and 30: River watershed, to the east by the
Page 31 and 32: an adjacent area locally known as t
Page 33 and 34: Water in the surficial aquifer is r
Page 35 and 36: The Upper Floridan aquifer (UFA) sy
Page 37 and 38: Figure 2-4. May and September 2001
Page 39 and 40: head differences indicating breache
Page 41 and 42: data (multiple regression) analyses
Page 43 and 44: 2.2 Land Use Changes in the Alafia
Page 45 and 46: Before discussing individual sub-ba
Page 47 and 48: Table 2-2. Land use and land cover
Page 49 and 50: Table 2-3. Land use and land cover
Page 51 and 52: Figure 2-13. 1972 and 1999 Land use
Page 53 and 54: 2.2.4 Lithia Springs Sub-Basin The
Page 55 and 56: 2.3 Hydrology The assessment of min
Page 57 and 58: Period of Record Median Daily Flows
Page 59 and 60: occurred during the spring were sim
Page 61 and 62: Conversely, since most of the Unite
Page 63 and 64: extending from 1940 to 1969 can be
Page 65 and 66: Period of Record Median Daily Flows
Page 67 and 68: third highest flow occurred early i
Page 69 and 70: Flow (cfs) Alafia River at Lithia,
Page 71 and 72: 100 North Prong Alafia River at Key
Page 73 and 74: Flow (cfs) South Prong Alafia River
Page 75 and 76: Alafia River at Lithia - Water Qual
Page 77: South Prong Watershed Above USGS Ga
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
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Alafia River - Cross Section 64 - W
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Delphi method lacks the rapid feedb
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TOTAL DAYS OF INUNDATION DURING THE
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Period of Record Median Daily Flows
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Wetted Perimeter - USGS 84.5 - SWFW
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Alafia River Station 91.5 Stage in
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section sites and corresponding flo
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4.9.1.2 Recreational Use Assessment
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Chapter 5 Results and Recommended M
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greater than 25 cfs would inundate
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For the USGS Lithia gage site, the
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40 35 30 25 20 15 10 T20 T21 T27 T3
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Wetted Perimeter (linear feet) 2000
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dominant vegetation zones, mucky so
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5.5.1 Application of PHABSIM for Bl
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5.5.3 Flow Relationships with Woody
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River begins on October 28 and ends
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Table 5-4. Maximum monthly percent-
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5.6.3 Short-Term Compliance Standar
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Table 5-5. Maximum monthly percent-
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5.8 Short-Term Compliance Standard
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Table 5-7. Proposed Minimum Flows f
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Biological Services Program Report
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Jones, G.W., and Upchurch, S.B., 19
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SDI Environmental Services, Inc. 20
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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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