Fla. Admin. Code R. 40C-8.031
| Spring Name | County | Head (ft NGVD) | Discharge (cfs) |
|---|---|---|---|
| Messant Spring | Lake | 32 | 12 |
| Miami Springs | Seminole | 27 | 4 |
| Palm Springs | Seminole | 27 | 7 |
| Rock Springs | Orange | 31 | 53 |
| Sanlando Springs | Seminole | 28 | 15 |
| Seminole Springs | Lake | 34 | 34 |
| Starbuck Springs | Seminole | 31 | 13 |
| Wekiwa Springs | Orange | 24 | 62 |
| System Name | County | Minimum Level | Level (ft NGVD) | Flow (cfs) | Hydroperiod Category | Duration (days) | Return Interval (years) |
|---|---|---|---|---|---|---|---|
| Black Water Creek at The SR 44 Bridge | Lake | Infrequent High | 27.0 | 340 | – | 7 | 5 |
| Frequent High | 25.8 | 145 | – | 30 | 2 | ||
| Average | 24.3 | 33 | – | 180 | 1.7 | ||
| Frequent Low | 22.8 | 2.5 | – | 90 | 15 | ||
| Phase 1 Restriction | 22.7 | 2.0 | – | – | – | ||
| Phase 2 Restriction | 22.5 | 1.0 | – | – | – | ||
| Phase 3 Restriction | 22.4 | 0.6 | – | – | – | ||
| Phase 4 Restriction | 22.3 | 0.3 | – | – | – | ||
| Infrequent Low | 21.9 | 0.0 | – | 7 | 100 | ||
| St. Johns River 1.5 miles downstream of Lake Washington weir | Brevard | Frequent High | 15.3 | 1450 | Seasonally Flooded | – | – |
| Average | 12.7 | 240 | Typically Saturated | – | – | ||
| Frequent Low | 11.3 | 28 | Semipermanently Flooded | – | – | ||
| St. Johns River at SR 44 near DeLand | Volusia | Frequent High | 1.9 | 4600 | – | 30 | 3 |
| Average | 0.8 | 2050 | – | 180 | 1.5 | ||
| Frequent Low | 0.3 | 1100 | – | 120 | 5 | ||
| Taylor Creek 1.7 miles downstream of structure S-164 | Frequent High | – | 95 | Seasonally Flooded | – | – | |
| Average | – | 17 | Typically Saturated | – | – | ||
| Frequent Low | – | 0.5 | Semipermanently Flooded | – | – | ||
| St. Johns River at SR 50 near Christmas | Orange and Brevard | Frequent High | 8.1 | 1950 | – | 30 | 2 |
| Average | 5.9 | 580 | – | 180 | 1.5 | ||
| Frequent Low | 4.2 | 140 | – | 120 | 5 | ||
| Infrequent Low | 2.7 | 43 | – | 60 | 50 | ||
| Wekiva River at the SR 46 Bridge | Seminole and Lake | Infrequent High | 9.0 | 880 | – | 7 | 5 |
| Frequent High | 8.0 | 410 | – | 30 | 2 | ||
| Average | 7.6 | 240 | – | 180 | 1.7 | ||
| Frequent Low | 7.2 | 200 | – | 90 | 3 | ||
| Phase 1 Restriction | 7.0 | 190 | – | – | – | ||
| Phase 2 Restriction | 6.9 | 180 | – | – | – | ||
| Phase 3 Restriction | 6.7 | 160 | – | – | – | ||
| Phase 4 Restriction | 6.5 | 150 | – | – | – | ||
| Infrequent Low | 6.1 | 120 | – | 7 | 100 |
| Time Period | Minimum Long Term Mean Flow |
|---|---|
| December 3, 2006 through March 31, 2009 | 133 cfs |
| April 1, 2009 through March 31, 2014 | 137 cfs |
| April 1, 2014 through March 31, 2019 | 142 cfs |
| April 1, 2019 through March 31, 2024 | 148 cfs |
| After March 31, 2024 | 157 cfs |
| System Name | County | Minimum Level | Level (ft NAVD) |
|---|---|---|---|
| Apshawa South | Lake | P25 | 83.6 |
| P50 | 82.3 | ||
| P75 | 80.8 | ||
| Brooklyn | Clay | P25 | 111.5 |
| P50 | 106.2 | ||
| P75 | 98.6 | ||
| Butler | Volusia | P50 | 20.1 |
| Geneva | Bradford | P25 | 101.7 |
| Clay | P50 | 98.3 | |
| P75 | 89.3 | ||
| Lochloosa | Alachua | P50 | 56.5 |
The minimum P25, P50, and P75 levels for Apshawa Lake South are based on the MFLs condition lake level time series (1/27/1959 – 12/31/2018), effective {February 2025} which is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-17728"https://www.flrules.org/Gateway/reference.asp?No=Ref-17728 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
MFL status of Apshawa Lake South will be assessed by comparing the minimum P25, P50, and P75 to the current P25, P50, and P75, respectively. The current P25, P50, and P75 for Apshawa Lake South are calculated by updating the current-pumping condition lake level time series (1/27/1959 – 12/31/2018) with post-2018 observed data at SJRWMD gage 2930258. The current-pumping condition lake level time series is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-17728"https://www.flrules.org/Gateway/reference.asp?No=Ref-17728 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
The minimum P25, P50, and P75 levels for Lake Brooklyn are based on the MFLs condition lake level time series (7/17/1957 – 12/31/2018), effective 9/28/2021, which is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-13524" https://www.flrules.org/Gateway/reference.asp?No=Ref-13524 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
MFL status of Lake Brooklyn will be assessed by comparing the minimum P25, P50, and P75 to the current P25, P50, and P75, respectively. The current P25, P50, and P75 for Lake Brooklyn are calculated by updating the current-pumping condition lake level time series (7/17/1957 – 12/31/2018) with post-2018 observed data at SJRWMD gage 3360373. The current-pumping condition lake level time series is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-13524" https://www.flrules.org/Gateway/reference.asp?No=Ref-13524 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
The minimum P50 level for Lake Butler is a long-term median lake level based on the MFLs condition lake level time series (1949 – 2018), effective September 30, 2020, which is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-12168" https://www.flrules.org/Gateway/reference.asp?No=Ref-12168 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
MFL status of Lake Butler will be assessed by comparing the minimum P50 to the current P50. The current P50 for Lake Butler is calculated by updating the simulated historical lake level time series (1949 – 2018) with post-2018 observed data at SJRWMD gage 03390378. The simulated historical lake level time series is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-12168" https://www.flrules.org/Gateway/reference.asp?No=Ref-12168 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
The minimum P25, P50, and P75 levels for Lake Geneva are based on the MFLs condition lake level time series (7/1/1957 – 12/31/2018), effective 9/28/2021, which is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-13525" https://www.flrules.org/Gateway/reference.asp?No=Ref-13525 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
MFL status of Lake Geneva will be assessed by comparing the minimum P25, P50, and P75 to the current P25, P50, and P75, respectively. The current P25, P50, and P75 for Lake Geneva are calculated by updating the current-pumping condition lake level time series (7/1/1957 – 12/31/2018) with post-2018 observed data at SJRWMD gage 11590497. The current-pumping condition lake level time series is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-13525" https://www.flrules.org/Gateway/reference.asp?No=Ref-13525 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
The minimum P50 level for Lochloosa Lake is a long-term median lake level based on the MFLs condition lake level time series (1957 – 2015), effective 1-30-19, which is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-10225" https://www.flrules.org/Gateway/reference.asp?No=Ref-10225 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
MFL status of Lochloosa Lake will be assessed by comparing the minimum P50 to the current P50. The current P50 for Lochloosa Lake is calculated by updating the simulated historical lake level time series (1957 – 2015) with post-2015 observed data at SJRWMD gage 71481615. The simulated historical lake level time series is incorporated by reference and available at HYPERLINK "https://www.flrules.org/Gateway/reference.asp?No=Ref-10225" https://www.flrules.org/Gateway/reference.asp?No=Ref-10225 and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529.
(7) The following minimum levels are established for Blue Cypress Water Management Area (BCWMA):
| Minimum Flows | Flow (cfs) | Level (NAVD) | Duration (days) | Return Interval (years) |
|---|---|---|---|---|
| Frequent high | 828 | 40.0 | 30 | 5 |
| Average | 638 | 38.2 | 180 | 1.7 |
| Frequent low | 572 | 37.0 | 120 | 3 |
The minimum surface water flows were developed to ensure that the associated surface water levels will be met. The two factors to be weighed in the status assessment of this MFL are (1) whether the surface water levels have been met; and, (2) the extent to which the surface water flow has been reduced due to groundwater withdrawals.
(13) Determining Ongoing Status – The purpose of this subsection is to provide the approach to determine whether the flow(s) and/or level(s) of a specific MFL water body is/are below or projected to fall below the rule-specified MFL criteria (along with the associated evaluations necessary to make such a determination). This status assessment is independent from and not a determination of consumptive use permit compliance or environmental resource permit compliance. Permit compliance is a regulatory function that is not considered to be within the scope of this subsection.
(a) A screening level analysis, which incorporates change in rainfall trend and uncertainty in MFLs, will be performed approximately every five years to monitor the status of an adopted MFL, as well as when permit applications are considered that may impact an MFL. If the screening level analysis shows that the MFL is being met based on the rainfall-adjusted flows or levels, then no further actions are required beyond continued monitoring. If the analysis shows that the MFL is not being met, or is trending toward not being met based on the rainfall-adjusted flows and levels, the District will conduct a cause and effect analysis to independently evaluate the potential impacts of various stressors on the MFL water body being assessed. Factors other than consumptive uses of water (e.g., long-term drought) can cause the flow or level of a surface watercourse, aquifer, surface water, or spring to drop below an adopted minimum flow or level. Factors to be considered in the determination of causation include, but are not limited to:
1. Rainfall or other climatic variables,
2. Consumptive use,
3. Land use changes or development,
4. Surface water drainage,
5. Geology/hydromorphology (e.g., sinkhole formation),
6. Water levels/flows in other appropriate water resources (e.g., nearby wells, lakes, streams, wetlands); and,
7. Ecological assessment information.
(b) The types of tools used in the causation analysis include, but are not limited to:
1. Double-mass analyses,
2. Rainfall/flow statistical analysis or flow regression,
3. Stage/duration/frequency analysis,
4. Modeling (regional, groundwater, ecological or water budget models); and,
5. Ecological tools.
Based on the causation analysis, the District will assess existing MFL criteria and any associated recovery and prevention strategies to determine the effectiveness of the strategies in recovering from or preventing significant harm to the water body.
Rulemaking Authority 373.042, 373.044, 373.113 FS. Law Implemented 373.042, 373.0421, 373.103, 373.415 FS. History–New 9-16-92, Amended 8-17-94, 6-8-95, 1-17-96, 8-20-96, 10-20-96, 11-4-98, 6-27-00, 2-13-01, 3-19-02, 5-12-03, 11-10-03, 1-12-04, 2-1-06, 12-3-06, 5-10-07, 5-24-07, 1-11-10, 8-22-13, 4-3-14, 11-25-14, 12-31-14, 1-31-16 (4)(aaa), 1-31-16 (4)(ssss), 2-1-17 (4)(w), 2-1-17 (6), (8), 6-27-17 (7), 6-29-17 (5), (8), (9), 1-30-19, 9-30-20, 9-28-21, 2-24-25.