Northern Tampa Bay 2007 MFL Assessment August 5 2008€¦ · 1946 1948 1950 1952 1954 1956 1958...
Transcript of Northern Tampa Bay 2007 MFL Assessment August 5 2008€¦ · 1946 1948 1950 1952 1954 1956 1958...
Northern Tampa Bay LTPRG2008 MFL ReviewAugust 5, 2008
Minimum Flows and LevelsIn 1998 – the District adopted 41 cypress wetlands, 15 lakes, and 7 Floridan aquifer wells as minimum level sitesSince then, we’ve added 86 additional lakes (101 total – 69 in NTB area)Eight rivers (or river segments) adopted –including the Upper and Lower Hillsborough RiverTwo springs adopted (Crystal and Sulphur)The plan for further MFL adoption is revised and approved each year
Current MFL Sites in NTB areaLake
Wetland
Well
Current MFL Sites in NTB areaLake
Wetland
Well
Not MFL sites – for comparison purposes only
Assessment of MFLs
Long-term median for lakes and wetlandsLong-term average for seawater intrusion wellsLakes, wetlands and wells assessed for 6 and 10 -year periods for the ending years 1999-2007
Lake Carroll
30
31
32
33
34
35
36
37
38
39
4019
46
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1971
1973
1975
1977
1979
1981
1983
1985
1987
1989
1991
1993
1996
1998
2000
2002
2004
Wat
er L
evel
(Fee
t NG
VD) L
ake
Car
roll
Monthly DataPOR MedianSix-Year MedianTen-Year MedianTwenty-Year Median
Crooked Lake1977-1983
105
107
109
111
113
115
117
119
121
123
125
127
129
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
Predicted Lake Elevation (ft)
Mea
sure
d La
ke E
leva
tio(f
LOC
95% LPI
95% UPI
99% LPI
99% UPI
1983
1982
1980
1979
1978
1977
2008 MFL Assessment
Assessment through calendar year 2007Rule of thumb (not the final definition of compliance) –– > 0.5 feet above MFL value – meeting MFL– > 0.5 feet below MFL value – not meeting
MFL– In between – “close”
Wetlands – 2007 Results10-year
8 wetlands meeting minimum level 15 wetlands not meeting minimum level3 wetlands close to meeting minimum
level14 wetlands without enough data to determine1 wetland lost in 2007
Wetlands – 2007 Results6-year
14 wetlands meeting minimum level13 wetlands not meeting minimum level12 wetlands close to meeting minimum level1 wetland without enough data to
determine 1 wetland lost in 2007
Wetlands – 2007 Results2-year *
4 wetlands above minimum level elevation *31 wetlands below minimum level elevation * 4 wetlands close to meeting minimum
level * 1 wetland lost in 2007
* Two years is not enough data for a minimum level determination
4141Total
10N/A
412Close
3115Not Meeting MFL
414Meeting MFL
20072006
NTB Wetlands (2- year)
* Two years is not enough data for a minimum level determination
Variable Distribution of Withdrawals
2001
4141Total
1515N/A
32Close
1514Not Meeting MFL
810Meeting MFL
200720062002
NTB Wetlands (10- year)
41
18
4
13
6
2001
414141Total
151517N/A
323Close
151414Not Meeting MFL
8107Meeting MFL
200720062002
NTB Wetlands (10- year)
2001
4141Total
24N/A
1213Close
1310Not Meeting MFL
1414Meeting MFL
200720062002
NTB Wetlands (6- year)
41
17
5
15
4
2001
414141Total
2416N/A
12134Close
131018Not Meeting MFL
14143Meeting MFL
200720062002
NTB Wetlands (6- year)
Current MFL Sites in NTB areaLake
Wetland
Well
Section 21 MFL Wetland
40
42
44
46
48
50
52
54
56
1/1/2000 1/1/2001 1/2/2002 1/3/2003 1/4/2004 1/4/2005 1/5/2006 1/6/2007
Wat
er L
evel
(ft N
GVD
)
Low Rainfall Average RainfallHigh Rainfall
Lakes – 2007 Results10-year
11 lakes meeting minimum level 31 lakes not meeting minimum level 26 lakes close to meeting minimum level 1 lake without enough data to determine
Lakes – 2007 Results6-year
27 lakes meeting minimum level 15 lakes not meeting minimum level 26 lakes close to meeting minimum level 1 lake without enough data to determine
Lakes – 2007 Results2-year *
6 lakes above minimum level elevation * 43 lakes below minimum level elevation * 20 lakes close to meeting minimum level *
* Two years is not enough data for a minimum level determination
6969Total
00N/A
2026Close
439Not Meeting MFL
634Meeting MFL
20072006
NTB Lakes (2- year)
* Two years is not enough data for a minimum level determination
2001
6969Total
11N/A
2626Close
3131Not Meeting MFL
1111Meeting MFL
200720062002
NTB Lakes (10- year)
69
4
9
51
5
2001
696969Total
114N/A
26266Close
313152Not Meeting MFL
11115Meeting MFL
200720062002
NTB Lakes (10- year)
2001
6969Total
11N/A
2624Close
1516Not Meeting MFL
2728Meeting MFL
200720062002
NTB Lakes (6- year)
69
1
11
52
5
2001
696969Total
110N/A
26244Close
151659Not Meeting MFL
27286Meeting MFL
200720062002
NTB Lakes (6- year)
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
Lake MFL Status 2001 – 10 Year
Lake
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
Lake MFL Status 2007 – 10 Year
Lake
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
Lake MFL Status 2001 – 6 Year
Lake
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
Lake MFL Status 2007 – 6 Year
Lake
6969Total
115N/A
267Close
3142Not Meeting MFL
115Meeting MFL
20072000
NTB Lakes (10- year)
6969Total
17N/A
2615Close
1540Not Meeting MFL
277Meeting MFL
20072000
NTB Lakes (6- year)
MFL Wells – 2007 Results10-year
3 wells meeting minimum level4 wells close to meeting minimum level
MFL Wells – 2007 Results6-year
3 wells meeting minimum level4 wells close to meeting minimum level
MFL Wells – 2007 Results2-year *
* Two years is not enough data for a minimum level determination
3 wells meeting minimum level *1 well not meeting minimum level * 3 wells close to meeting minimum level *
MFL Status 2007 – 10 YearMeets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
Lake
Wetland
Well
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
MFL Status 2007 – 6 Year
Lake
Wetland
Well
Meets MFL
Does not meet MFL
Very near MFL
Site lost
Not enough data
MFL Status 2007 – 2 Year
Lake
Wetland
Well
MFL Site EvaluationsSince 1998, staff has continued to evaluate, collect data, install additional instrumentation, and maintain instrumentation at all sitesWetlands are particularly complicated due to multiple instrumentation needs, maintenance, remoteness, etc.In many wetlands, issues include survey discrepancies, access issues, development effects, and reconsideration of site status.
2008 Assessment of Recovery Levels
Recovery Levels meant to serve as guidelines as to what the Floridan aquifer levels would be at 90 mgd, based on the District’s recovery assessment40 original wells – 2 since destroyedBased on long-term average
Recovery Wells – 2007 Results - 10-year
2 wells meeting recovery level31 wells not meeting recovery level5 wells close to meeting their recovery level2 wells lost
Recovery Status 2007 – 10 YearMeets REC
Does not meet REC
Very near REC
Well lost
Recovery Wells – 2007 Results - 6-year
8 wells meeting recovery level 21 wells not meeting recovery level9 wells close to meeting their recovery level
Recovery Status 2007 – 6 YearMeets REC
Does not meet REC
Very near REC
Not enough data
Recovery Wells – 2007 Results - 2-year *
1 well above recovery level elevation *33 wells below recovery level elevation *4 wells close to meeting their recovery level *
* Two years is not enough data to do a recovery level determination
Recovery Status 2007 – 2 YearMeets REC
Does not meet REC
Very near REC
Not enough data
General ConclusionsMFLs (and other data/observations) continue to show regional improvementCompliance of MFLs not achieved yet due to:– Cutbacks and distribution of withdrawals not
complete– Methodologies still in development– Limited time for assessment
Upcoming Recovery and MFL Issues
Evaluate the need for adjustments to MFL rules– Additions or replacement to sites– Additions or alterations to methodologies
Recovery Assessment AnalysesPeer Review