The Determination of Minimum Flows for Sulphur Springs, Tampa

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DRAFT Table 3-1 Summary statistics of vertical profile measurements taken in the upper spring run by the University of Florida and the SWFWMD. Date Spring Flow (cfs) n all depths Mean salinty + 1 s.d. (all depths) Mean surface salinity Mean bottom salinity Mean DO + 1 s.d. (all depths) Mean surface DO Mean bottom DO % DO values
DRAFT pumping events resulted in salinity increases of 4 to 5 ppt. Vertical profile measurements in the spring run conducted as part of these tests also showed that some pumping events caused salinity increases while others did not (Table 3-1). The findings of these intermediate flow tests are discussed in more detail in Chapter 5 (Results of the Minimum Flow Analysis). 3.5 Dissolved oxygen concentrations in the spring run and response to withdrawals from the spring pool. Dissolved Oxygen (DO) data for the spring run are limited to the vertical profile measurements taken by UF and District staff. As described in Section 2.5.3, the groundwater discharge to the spring pool is typically not well oxygenated. The median DO value for grab samples from the pool is 1.78 mg/l (Table 2-2). During periods of normal flow, however, waters in the spring run are well oxygenated, indicating that the fall over the outlet structure and turbulence in the plunge pool is effective at aerating the spring water. Summary statistics for DO profiles measured by UF are included in Table 3-1. During periods of normal spring flow, mean DO values for surface and bottom waters ranged between 4.4 and 6.1 mg/l. Out of a combined total of 240 salinity readings on these dates, only 6 values were slightly below 4 mg/l. Low DO values were observed by UF during withdrawal events in May and July 2000, when discharge from the pool was reduced to zero or very low rates of flow (1 cfs). Sixty-three percent of the DO values were below 4 mg/l during the May 26 sampling, but none were below 2 mg/l. DO values were considerably lower during the July 14 sampling, as 81% of the DO values were less than 2 mg/l, with a mean bottom DO value of 0.9 mg/l. These bottom DO values may have been related to density stratification in the run, as evidenced by the difference between mean surface and bottom salinity values (Table 3-1). DO concentrations in vertical profiles measured by the District in 2001 and 2002 are also summarized in Table 3-1. For the first nine sampling dates, when flows ranged between 16 and 32 cfs, average DO values for all depths ranged between 5.3 and 9.2 mg/l and there were no DO readings below 4 mg/l. On June 12, 2002, when flows were 13 cfs, nine percent of the DO readings were below 4 mg/l. There was significant density stratification on this date, as mean surface and bottom water salinity values differed by 10.2 ppt at the time of sampling. Vertical profiles were also taken by the District when withdrawals were taken from the spring at a rate of 31 cfs (June 20, 2002). Six percent of the DO values were below 2 mg/l, while two percent were between 2 and 4 mg/l. In general, these data indicate the DO concentrations in the spring run are well oxygenated during times of normal flow from the spring pool. The occurrence of hypoxia (low oxygen concentrations) differed between periods when withdrawals reduced the rate of flow to zero or very low values. The occurrence of hypoxia may be related to the 3 - 9
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The Determination of Minimum Flows
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DRAFT TABLE OF CONTENTS List of Tab
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4.5 Goal 1 - Minimize the incursion
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DRAFT LIST OF FIGURES Chapter 2 - P
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Fig. 3-13 Fig. 3-14 Fig. 3-15 Fig.
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Fig. 5-7 Fig. 5-8 Fig. 5-9 Fig. 5-1
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Acronyms and Definitions DRAFT AMO
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DRAFT Executive Summary The Southwe
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DRAFT below 19 feet NGVD of 1929. T
Page 24 and 25: CHAPTER 1 PURPOSE AND BACKGROUND OF
Page 26 and 27: DRAFT water, or aquifer, provided t
Page 28: DRAFT one the indicators were the f
Page 31 and 32: DRAFT The spring and its run lie in
Page 33 and 34: DRAFT Figure 2-3. Recent photograph
Page 35 and 36: 2 - 6 DRAFT
Page 37 and 38: DRAFT -5 -4 -3 -2 -1 0 1 2 3 0.4 4
Page 39 and 40: DRAFT 10.0 Yrly_Pumpage.grf 15 Annu
Page 41 and 42: DRAFT 1999 2000 2001 2002 2003 35 D
Page 43 and 44: DRAFT Figure 2-14. Return flow stru
Page 45 and 46: DRAFT 40 Jan. Feb. Mar. Apr. May Ju
Page 47 and 48: DRAFT due to withdrawals for public
Page 49 and 50: DRAFT Figure 2-19 . Temporal trend
Page 51 and 52: DRAFT Figure 2-20. Temporal trends
Page 53: DRAFT In comparison to specific con
Page 57 and 58: DRAFT average daily withdrawals for
Page 59 and 60: DRAFT Figure 2-25. Average specific
Page 61 and 62: DRAFT withdrawal rate of 31 cfs dur
Page 63 and 64: DRAFT Table 2-2. Sulphur Springs su
Page 65 and 66: DRAFT These plots indicate that his
Page 67 and 68: DRAFT CHAPTER 3 ECOLOGICAL RESOURCE
Page 69 and 70: DRAFT 3 Run_Riv_Stg.grf Water Surfa
Page 71 and 72: DRAFT 3.4 Salinity in the spring ru
Page 73: DRAFT 1999 2000 2001 2002 2003 2004
Page 77 and 78: DRAFT As discussed in Section 2.5.3
Page 79 and 80: DRAFT tolerate and are frequently f
Page 81 and 82: DRAFT Appendix B are color coded to
Page 83 and 84: DRAFT habitat in the lower river pr
Page 85 and 86: DRAFT The FWC using a modified stra
Page 87 and 88: DRAFT increased with a return to no
Page 89 and 90: DRAFT 2000. The results from three
Page 91 and 92: DRAFT species (10 to 13) were colle
Page 93 and 94: DRAFT 1940 1950 1960 1970 1980 1990
Page 95 and 96: DRAFT . 1000.00 100.00 10.00 1.00 0
Page 97 and 98: DRAFT 3.9.2 The effects of flows fr
Page 99 and 100: DRAFT Data from the Tampa Bay Water
Page 101 and 102: DRAFT EPCHC Period of Record Data L
Page 103 and 104: DRAFT 35 30 1996 1997 1998 1999 200
Page 105 and 106: 7 DRAFT Elevation (m) 1 0 -1 -2 -3
Page 107 and 108: 8 24 25 29 DRAFT Figure 3-20, 3-21
Page 109 and 110: DRAFT Figure 3-22 HBMP & EPCHC 2000
Page 111 and 112: DRAFT of the river between the dam
Page 113 and 114: DRAFT 10 11 12 13 14 15 16 17 10 11
Page 115 and 116: DRAFT The HBMP project (PBSJ 2003)
Page 117 and 118: DRAFT xanthurus) red drum (Sciaenop
Page 119 and 120: DRAFT as manatees seek fresh water
Page 121 and 122: 1999 2000 2001 2002 DRAFT 35 TmpSS_
Page 123 and 124: DRAFT Platt Street 1974-2002 Columb
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DRAFT Median and minimum water temp
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DRAFT Figure 3-31 1999 2000 2001 20
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DRAFT Figure 3-33 2001 2002 2003 20
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DRAFT CHAPTER 4 TECHNICAL APPROACH
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DRAFT The sum of these consideratio
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DRAFT It is the conclusion of this
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DRAFT criteria. The
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DRAFT reach of the river 50 meters
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DRAFT of the dam. The experiments w
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DRAFT Salinity incursions above the
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DRAFT Figure 5-3. A - D. Box and wh
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DRAFT The results of the vertical p
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DRAFT Sulphur Springs < 33 cfs, Hil
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DRAFT Other breakpoints in the data
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DRAFT 40 Percent of Observations -
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DRAFT It is possible that infrequen
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DRAFT The effects of tide stage on
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DRAFT medians rise to near -0.2 fee
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DRAFT Sulphur Springs < 33 cfs, Hil
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DRAFT Sulphur Springs on salinity d
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7 29 DRAFT Elevation (m) 0/0cfs 1 0
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23 24 24 25 25 29 DRAFT Figures 14,
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DRAFT Viewed strictly from the infl
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DRAFT water removed would fluctuate
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DRAFT euryhaline, there were also m
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DRAFT 01/90 01/93 01/96 01/99 01/02
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DRAFT the intent of that condition
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DRAFT included inflows to the model
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DRAFT Flows for Sulphur Springs wer
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DRAFT ∆T represents the differenc
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DRAFT Figure 25 Temp (C) 22 Histori
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DRAFT Figure 26 Temp (C) 24 22 Hist
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DRAFT Similar to the coldest period
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DRAFT 5.7. Consideration of future
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DRAFT Culter, J. 1986. Benthic Inve
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DRAFT Shafland, P. L. and K. J. Foo
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APPENDIX A (from Chapter 2) Time se
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Sulphur Springs Water Quality 1991-
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Appendix B. Presence of macroinvert
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Appendix C. Percent composition of
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Appendix C. Percent composition of
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APPENDIX D (from Chapter 3) Percent
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APPENDIX D. Percent composition of
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APPENDIX D. Percent composition of
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APPENDIX E (from Chapter 3) Abundan
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BARE SAND FILAMENTOUS ALGAE COMBINE
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APPENDIX F - HILLSBOROUGH RIVER TEM
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Appendix G Daily values for mean, m
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APPENDIX H (from Chapter 5) Time se
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Experiment Number 6
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Appendix I Daily values for minimum
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28FEB2000 9.8 0.0 1.9 9.7 7.8 . 18.
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12FEB2001 14.0 3.5 1.7 4.6 2.9 1.1
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