The Determination of Minimum Flows for Sulphur Springs, Tampa

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DRAFT data collection since the spring of 2000. The first interpretive report for this program was published in April 2003 (PBSJ 2003). The characterization of the effects of Sulphur Springs on the water quality and the river relies largely on data collected by these various programs. Figure 3-12 summarizes the length of salinity data at various fixed stations in the river, including sites monitored by the EPCHC and continuous recorders operated by the USGS. A full suite of water quality parameters is measured at the EPCHC sites, while the USGS sites are limited to water level, temperature, specific conductance (converted to salinity), and for some limited periods, dissolved oxygen readings. 1970 1980 1990 2000 2010 Rowlett Platt Columbus Rowlett SulphSprings Run Mouth 1974.1 2002.9 1974.0 2002.9 1979.7 2002.9 1997.0 2003.1 1999.4 2003.3 1999.4 2003.2 1999.4 2003.0 Rowlett Platt Columbus Rowlett SulphSprings Run Mouth Sligh 1999.6 2002.9 Sligh Hillsulph I- 275 Temperature Database Continuous (15 minute) Data Monthly Grab Samples 1999.6 2003.3 1999.7 2003.2 Hillsulph I- 275 Hanna 2001.5 2003.3 Hanna Platt 2002.1 2003.2 Platt TempDataRecord.grf 1970 1980 1990 2000 2010 Figure 3-12. Periods of record for salinity, temperature, and dissolved oxygen measurements at fixed location water quality sites sampled by the EPCHC ambient monitoring program and data recorders operated by the USGS. 3 - 32
DRAFT Data from the Tampa Bay Water HBMP, which are not included in Figure 3-9, are available for salinity, temperature, pH, and dissolved oxygen at a large number of sites, and for chlorophyll a, color, total suspended solids, and total and dissolved organic carbon at a subset of these. Because salinity and dissolved oxygen concentrations are most closely affected by Sulphur Springs flow, the discussion on the effects of Sulphur Springs on the water quality of the Hillsborough River is limited to those parameters. 3.9.2.1 Empirical salinity data plots Flows from Sulphur Springs have their greatest effect on the water quality of the Lower Hillsborough River during times when there is no flow at the dam. Box and whisker plots of salinity in 2-kilometer intervals along the lower river are presented in Figure 3-13 using data from the Tampa Bay Water HBMP and the EPHC/HIMP programs during 2000-2002. This period is chosen for analysis as it represents the most spacially extensive data for the lower river. Statistical distributions of surface and bottom water salinity values are graphed separately for flow and no-flow conditions from the Hillsborough River reservoir. Since the USGS frequently reports flow values up to 3 cfs to represent leakage from the dam, no-flow conditions were classified as less than 3 cfs to denote no flow from the reservoir spillway. Brackish waters can extend to the base of the Hillsborough River dam during times of no flow. The median salinity values for surface and bottom waters near the base of the dam (km 16) were approximately 10 ppt for no flow conditions (Figure 3-13). Compared to other long-term data for the river, these values are particularly high, as the HBMP/HIMP data are heavily influenced by the prolonged 2000-2001 drought when salinity in the lower river reached record levels. Surface salinity values do not show a strong gradient between kilometers 10 and 16 during no-flow conditions. In fact, the median surface salinity value near the dam (km 16) is greater than the median value near Sulphur Springs (km 12). This reverse salinity gradient, in which salinity increases upstream, is due to the effect of Sulphur Springs, which reduces surface salinity in the river near the spring outfall. Salinity values in the lower river are substantially lower for flow conditions. Median salinity values at or near fresh water extend downstream to km 10 for surface waters and to km 12 for bottom waters. Under many flow conditions, fresh waters extend from the dam downstream past Sulphur Springs. Box and whisker plots of salinity data from the four EPCHC fixed location sites show similar relationships (Figure 3-14), but reflect a longer period of record. The median surface salinity value at Rowlett Park (km 15.6) under no-flow conditions is 6 ppt, which is substantially lower than the median value in the HBMP/HIMP data set. Surface salinity values are typically fresh down to km 10.6 for flow conditions, but the median bottom salinity at this location during flows is near 8 ppt. It should be noted the period of record at this site (Sligh Avenue) is much shorter than for the other EPCHC stations (Figure 3-12.). In general, the box and whisker plots show there are marked differences in the salinity characteristics of the lower river between flow and no-flow conditions, particularly upstream of Sulphur Springs. 3 - 33
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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
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CHAPTER 1 PURPOSE AND BACKGROUND OF
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DRAFT water, or aquifer, provided t
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DRAFT one the indicators were the f
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DRAFT The spring and its run lie in
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DRAFT Figure 2-3. Recent photograph
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2 - 6 DRAFT
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DRAFT -5 -4 -3 -2 -1 0 1 2 3 0.4 4
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DRAFT 10.0 Yrly_Pumpage.grf 15 Annu
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DRAFT 1999 2000 2001 2002 2003 35 D
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DRAFT Figure 2-14. Return flow stru
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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 and 74: DRAFT 1999 2000 2001 2002 2003 2004
Page 75 and 76: DRAFT pumping events resulted in sa
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: DRAFT 3.9.2 The effects of flows fr
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
Page 125 and 126: DRAFT Median and minimum water temp
Page 127 and 128: DRAFT Figure 3-31 1999 2000 2001 20
Page 129 and 130: DRAFT Figure 3-33 2001 2002 2003 20
Page 131 and 132: DRAFT CHAPTER 4 TECHNICAL APPROACH
Page 133 and 134: DRAFT The sum of these consideratio
Page 135 and 136: DRAFT It is the conclusion of this
Page 137 and 138: DRAFT criteria. The
Page 139: DRAFT reach of the river 50 meters
Page 142 and 143: DRAFT of the dam. The experiments w
Page 144 and 145: DRAFT Salinity incursions above the
Page 146 and 147: 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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The Determination of Minimum Flows for Sulphur Springs, Tampa

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