The Determination of Minimum Flows for Sulphur Springs, Tampa
The Determination of Minimum Flows for Sulphur Springs, Tampa The Determination of Minimum Flows for Sulphur Springs, Tampa
DRAFT 3.11.2 Thermal characteristics of the Lower Hillsborough River Average yearly water column temperatures for the period of record at four stations in the Lower Hillsborough River measured by the EPCHC range from 24.13 to 24.80 o C (Table 3-4), which are near the average temperature for Sulphur Springs. Mean water temperatures are similar among stations; the largest difference in annual means is for middle depths (0.94 o C), while surface means vary by only 0.31 o C. Table 3-4 Mean water temperatures ( 0 C) for four stations monitored by the Environmental Protection Commission of Hillsborough County for 1999-2002. Station Kilometer Surface Middle Bottom Water column mean Platt 24.5 24.6 24.5 24.5 Columbus 24.2 24.9 25.0 24.7 Sligh 24.2 25.0 25.2 24.8 Rowlett 24.2 24.1 24.1 24.1 Despite this similarity in mean values, spatial and seasonal temperature variations are more pronounced and show a consistent pattern among stations. Box and whisker plots of monthly water column temperatures for the period of record at the four EPCHC sites are shown in Figure 3-28. Median monthly temperatures (Appendix F) are at or below 20 o C for December, January and February of the year at the Platt, Columbus, and Rowlett stations. These represent months when there would be a frequent need for thermal refuge for manatees in the lower river. Median water column temperatures at Sligh Avenue remain near or above 20 o C for these months, indicating the reach of the river below Sulphur Springs tends to stay warmer during the winter. The period for Sligh Ave shown in Figure 3-28 is considerably shorter than the other stations, which could affect these results. To correct for differences in period of record, monthly mean and minimum water temperatures for the 1999 – 2002 at these stations are plotted in Figures 3-29 A and B. Median and minimum temperatures at Sligh are again warmer than the other stations in the winter months, indicating this reach of the river may have thermal advantages for manatees and other cold sensitive species. During summer months, median water temperatures in the upper reaches (Rowlett and Sligh) remain cooler than the lower reaches, probably reflecting the flow of water from Sulphur Springs and also the Hillsborough River reservoir. Seasonal water temperature fluctuations were greatest at Platt station near the mouth of the river, which is more closely affected by water temperatures in Tampa Bay. 3 - 56
DRAFT Platt Street 1974-2002 Columbus Drive 1974-2002 Sligh Avenue 1999- 2002 Rowlett 1974-2002 Figure 3-28. Box and whisker plots of monthly water temperatures for the periods of record at four sites monitored by the EPCHC ambient monitoring program (all depths combined). Figure 3-28 3 - 57
- 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 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: 1999 2000 2001 2002 DRAFT 35 TmpSS_
- 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
- Page 148 and 149: DRAFT The results of the vertical p
- Page 150 and 151: DRAFT Sulphur Springs < 33 cfs, Hil
- Page 152 and 153: DRAFT Other breakpoints in the data
- Page 154 and 155: DRAFT 40 Percent of Observations -
- Page 156 and 157: DRAFT It is possible that infrequen
- Page 158 and 159: DRAFT The effects of tide stage on
- Page 160 and 161: DRAFT medians rise to near -0.2 fee
- Page 162 and 163: DRAFT Sulphur Springs < 33 cfs, Hil
- Page 164 and 165: DRAFT Sulphur Springs on salinity d
- Page 166 and 167: 7 29 DRAFT Elevation (m) 0/0cfs 1 0
- Page 168 and 169: 23 24 24 25 25 29 DRAFT Figures 14,
- Page 170 and 171: DRAFT Viewed strictly from the infl
DRAFT<br />
Platt Street 1974-2002<br />
Columbus Drive<br />
1974-2002<br />
Sligh Avenue 1999-<br />
2002<br />
Rowlett 1974-2002<br />
Figure 3-28. Box and whisker plots <strong>of</strong> monthly water temperatures <strong>for</strong> the periods <strong>of</strong> record at<br />
four sites monitored by the EPCHC ambient monitoring program (all depths combined).<br />
Figure 3-28<br />
3 - 57
Change language