40C-8.031. Minimum Surface Water Levels and Flows and Groundwater Levels

(1) The following minimum groundwater levels and minimum mean annual spring flows are established: 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 (2) The following minimum surface water levels and flows are established: 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 (3) The following minimum surface water flows are established for Blue Spring in Volusia County: 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 (4) The following minimum surface water levels are established: System Name County Minimum Level Level (ft NGVD) Level (ft NAVD) Hydroperiod Category Duration (days) Return Interval (years) (a) Argenta Putnam Frequent High 50.1 49.0 Seasonally Flooded – – Average 47.7 46.7 Typically Saturated – – Frequent Low 46.3 45.3 Semipermanently Flooded – – (b) Ashby Volusia Frequent High 12.3 11.3 – 60 2 Frequent Low 11.1 10.2 – 120 5 (c) Banana Putnam Frequent High 37.7 36.8 – 30 3 Average 36.7 35.8 – 180 1.7 Frequent Low 33.7 32.8 – 120 5 (d) Bell Putnam Frequent High 42.5 44.5 Temporarily Flooded – – Average 40.5 36.4 Typically Saturated – – Frequent Low 38.7 37.9 Semipermanently Flooded – – (e) Big Volusia Frequent High 26.1 25.1 Seasonally Flooded – – Average 25.0 24.1 Typically Saturated – – Frequent Low 23.7 22.7 Semipermanently Flooded – – (f) Bird Pond Putnam Frequent High 41.8 40.8 Seasonally Flooded – – Average 39.5 38.5 Typically Saturated – – Frequent Low 38.1 37.1 Semipermanently Flooded – – (g) Blue Pond Clay Frequent High 174.1 173.1 Temporarily Flooded – – Average 173.3 172.3 Typically Saturated – – Frequent Low 171.7 170.7 Semipermanently Flooded – – (h) Boggy Marsh Lake Frequent High 117.3 116.4 Seasonally Flooded – – Average 115.9 115.0 Typically Saturated – – Frequent Low 114.5 113.6 Semipermanently Flooded – – (i) Bowers Marion Frequent High 57.1 56.1 Temporarily Flooded – – Average 54.0 53.1 Typically Saturated – – Frequent Low 52.7 51.7 Semipermanently Flooded – – (j) Brantley Seminole Frequent High 46.3 45.3 Seasonally Flooded – – Average 45.6 44.6 Typically Saturated – – Frequent Low 44.1 43.1 Semipermanently Flooded – – (k) Broward Putnam Frequent High 40.0 39.1 Temporarily Flooded – – Average 38.2 35.8 Typically Saturated – – Frequent Low 36.5 35.6 Semipermanently Flooded – – (l) Burkett Orange Frequent High 53.5 52.5 Seasonally Flooded – – Average 52.6 51.6 Typically Saturated – – Frequent Low 51.2 50.2 Semipermanently Flooded – – (m) Charles Marion Frequent High 40.2 39.3 Seasonally Flooded – – Average 39.3 38.4 Typically Saturated – – Frequent Low 37.9 36.9 Semipermanently Flooded – – (n) Cherry Lake Frequent High 96.0 94.9 Seasonally Flooded – – Average 94.9 93.8 Typically Saturated – – Frequent Low 93.4 92.4 Semipermanently Flooded – – (o) Clear Putnam Frequent High 37.4 36.4 Temporarily Flooded – – Average 36.4 35.4 Typically Saturated – – Frequent Low 34.9 34.0 Semipermanently Flooded – – (p) Colby Volusia Frequent High 27.6 26.6 – 30 3 Frequent Low 22.9 21.8 – 120 3 (q) Como Putnam Frequent High 37.7 36.8 – 30 3 Average 36.7 35.8 – 180 1.7 Frequent Low 33.7 32.8 – 120 5 (r) Como, Little Lake Putnam Frequent High 37.7 36.8 – 30 3 Average 34.6 33.7 – 180 1.7 Frequent Low 32.6 31.7 – 120 5 (s) Coon Pond Volusia Frequent High 35.7 34.8 Seasonally Flooded – – Average 34.6 33.6 Typically Saturated – – Frequent Low 33.1 32.2 Semipermanently Flooded – – (t) Cowpen Putnam Infrequent High 92.0 90.8 30 25 Average 85.2 84.0 180 1.7 Frequent Low 83.5 82.3 120 2.7 (u) Cow Pond Volusia Frequent High 40.5 39.5 Seasonally Flooded – – Average 39.8 38.8 Typically Saturated – – Frequent Low 37.6 36.6 Semipermanently Flooded – – (v) Crystal/Baker Putnam Frequent High 35.5 34.6 Seasonally Flooded – – Average 33.9 33.0 Typically Saturated – – Frequent Low 33.0 32.1 Semipermanently Flooded – – (w) Daugharty Volusia Frequent High 44.8 43.8 Temporarily Flooded – – Average 42.6 41.6 Typically Saturated – – Frequent Low 41.2 40.1 Semipermanently Flooded – – (x) Davis Volusia Frequent High 36.2 35.2 Seasonally Flooded – – Average 35.4 34.4 Typically Saturated – – Frequent Low 34.0 33.0 Semipermanently Flooded – – (y) Deep Putnam Frequent High 35.0 34.1 Seasonally Flooded – – Average 33.1 32.2 Typically Saturated – – Frequent Low 32.2 31.3 Semipermanently Flooded – – (z) Dias Volusia Frequent High 34.6 33.5 Seasonally Flooded – – Average 33.5 33.0 Typically Saturated – – Frequent Low 32.2 31.6 Semipermanently Flooded – – (aa) Disston Flagler Frequent High 13.8 12.8 Seasonally Flooded – – Average 13.2 12.3 Typically Saturated – – Frequent Low 12.5 11.5 Semipermanently Flooded – – (bb) Dorr Lake Frequent High 43.5 42.5 Seasonally Flooded – – Average 43.1 42.1 Typically Saturated – – Frequent Low 42.1 41.0 Semipermanently Flooded – – (cc) Dream Pond Putnam Frequent High 49.0 48.0 Seasonally Flooded – – Average 47.5 46.5 Typically Saturated – – Frequent Low 46.0 45.1 Semipermanently Flooded – – (dd) Drudy Volusia Frequent High 42.1 41.0 Seasonally Flooded – – Average 40.6 39.5 Typically Saturated – – Frequent Low 39.1 38.1 Semipermanently Flooded – – (ee) Echo Putnam Frequent High 38.8 37.9 Seasonally Flooded – – Average 36.7 35.7 Typically Saturated – – Frequent Low 35.2 34.3 Semipermanently Flooded – – (ff) Emma Lake Frequent High 94.1 93.0 Seasonally Flooded – – Average 92.5 91.4 Typically Saturated – – Frequent Low 91.1 90.0 Semipermanently Flooded – – (gg) Emporia Volusia Frequent High 38.9 37.8 Seasonally Flooded – – Average 35.8 34.7 Typically Saturated – – Frequent Low 34.3 31.6 Semipermanently Flooded – – (hh) Estella Putnam Frequent High 38.6 37.7 Seasonally Flooded – – Average 37.2 36.3 Typically Saturated – – Frequent Low 36.5 35.5 Semipermanently Flooded – – (ii) Fox Brevard Frequent High 16.7 15.4 Temporarily Flooded – – Average 15.3 14.0 Typically Saturated – – Frequent Low 13.8 12.6 Semipermanently Flooded – – (jj) Georges Lake Putnam Frequent High 98.4 97.4 Seasonally Flooded – – Average 97.8 96.9 Typically Saturated – – Frequent Low 97.0 96.1 Semipermanently Flooded – – (kk) Gertie Volusia Frequent High 27.5 26.5 Temporarily Flooded – – Average 25.6 24.6 Typically Saturated – – Frequent Low 23.3 22.4 Semipermanently Flooded – – (ll) Gore Flagler Frequent High 21.1 20.0 – 30 3 Average 20.6 19.6 – 180 1.5 Frequent Low 19.2 18.2 – 120 5 (mm) Grandin Putnam Frequent High 81.5 80.7 – 30 2 Frequent Low 78.6 77.8 – 120 5 (nn) Halfmoon Marion Frequent High 49.7 48.6 Seasonally Flooded – – Average 47.9 46.7 Typically Saturated – – Frequent Low 46.5 45.3 Semipermanently Flooded – – (oo) Helen Volusia Frequent High 46.1 45.0 Temporarily Flooded – – Average 44.2 43.2 Typically Saturated – – Frequent Low 43.6 42.6 Semipermanently Flooded – – (pp) Hires Volusia Frequent High 41.0 40.0 Seasonally Flooded – – Average 39.5 38.5 Typically Saturated – – Frequent Low 38.0 37.0 Semipermanently Flooded – – (qq) Hokey Volusia Frequent High 35.4 34.4 Seasonally Flooded – – Average 33.7 32.7 Typically Saturated – – Frequent Low 32.3 31.3 Semipermanently Flooded – – (rr) Hopkins Prairie Marion Frequent High 25.8 24.5 Seasonally Flooded – – Average 23.4 22.1 Typically Saturated – – Frequent Low 22.0 20.7 Semipermanently Flooded – – (ss) Howell Putnam Frequent High 34.5 33.5 Seasonally Flooded – – Average 33.6 32.7 Typically Saturated – – Frequent Low 31.8 30.9 Semipermanently Flooded – – (tt) Howell Seminole Frequent High 53.7 52.7 Seasonally Flooded Average 52.9 51.9 Typically Saturated Frequent Low 51.5 50.5 Semipermanently Flooded (uu) Indian Volusia Frequent High 36.2 35.2 30 3 Average 35.0 34.0 180 1.7 Frequent Low 32.8 31.8 120 5 (vv) Irma Orange Frequent High 55.1 54.1 Seasonally Flooded – – Average 54.8 53.8 Typically Saturated – – Frequent Low 53.4 52.4 Semipermanently Flooded – – (ww) Kerr Marion Infrequent High 25.6 24.6 30 25 Frequent High 23.3 22.3 14 2 Average 21.7 20.7 180 1.7 Frequent Low 20.4 19.4 120 5 (xx) Lizzie Putnam Frequent High 43.9 43.0 Seasonally Flooded – – Average 42.7 41.8 Typically Saturated – – Frequent Low 41.7 40.8 Semipermanently Flooded – – (yy) Louisa Lake Frequent High 96.5 95.6 Seasonally Flooded – – Average 95.4 94.5 Typically Saturated – – Frequent Low 94.0 93.0 Semipermanently Flooded – – (zz) Lower Lake Louise Volusia Frequent High 31.8 30.8 Seasonally Flooded – – Average 31.2 30.1 Typically Saturated – – Frequent Low 29.7 28.7 Semipermanently Flooded – – (aaa) Lucy Lake Frequent High 94.1 93.0 Seasonally Flooded – – Average 92.5 91.4 Typically Saturated – – Frequent Low 91.1 90.0 Semipermanently Flooded – – (bbb) Magnolia Clay Frequent High 124.7 123.6 Seasonally Flooded – – Average 124.2 123.1 Typically Saturated – – Frequent Low 121.4 120.3 Semipermanently Flooded – – (ccc) Mall, Little Lake Putnam Frequent High 38.7 37.7 Seasonally Flooded – – Average 36.8 35.8 Typically Saturated – – Frequent Low 35.2 34.2 Semipermanently Flooded – – (ddd) Margaret Putnam Frequent High 35.2 34.2 Seasonally Flooded – – Average 34.5 33.5 Typically Saturated – – Frequent Low 32.5 31.5 Semipermanently Flooded – – (eee) Martha Orange Frequent High 53.5 52.5 Seasonally Flooded – – Average 52.6 51.6 Typically Saturated – – Frequent Low 51.2 50.2 Semipermanently Flooded – – (fff) Marvin Putnam Frequent High 38.6 37.6 Seasonally Flooded – – Average 37.3 36.4 Typically Saturated – – Frequent Low 36.3 35.3 Semipermanently Flooded – – (ggg) McGrady Putnam Frequent High 41.5 40.6 Seasonally Flooded – – Average 39.9 38.9 Typically Saturated – – Frequent Low 37.8 36.8 Semipermanently Flooded – – (hhh) McKasel Putnam Frequent High 36.7 35.7 Seasonally Flooded – – Average 35.5 34.6 Typically Saturated – – Frequent Low 34.1 33.1 Semipermanently Flooded – – (iii) Melrose Putnam Frequent High 104.7 103.6 30 3 Average 104.2 103.1 180 1.7 Frequent Low 103.7 102.6 120 10 (jjj) Mills Seminole Frequent High 42.5 41.1 Seasonally Flooded – – Average 41.4 40.3 Typically Saturated – – Frequent Low 39.9 38.9 Semipermanently Flooded – – (kkk) Minneola Lake Frequent High 96.0 95.1 Seasonally Flooded – – Average 95.3 94.4 Typically Saturated – – Frequent Low 93.9 93.0 Semipermanently Flooded – – (lll) Monroe Seminole and Volusia Frequent High 2.8 1.9 – 30 2 Average 1.2 0.3 – 180 1.5 Frequent Low 0.5 -0.4 – 120 5 (mmm) Nettles/English Putnam Frequent High 44.3 43.3 Seasonally Flooded – – Average 42.7 41.9 Typically Saturated – – Frequent Low 41.7 40.7 Semipermanently Flooded – – (nnn) Nicotoon Marion Frequent High 54.7 53.7 Seasonally Flooded – – Average 53.3 52.3 Typically Saturated – – Frequent Low 51.9 50.9 Semipermanently Flooded – – (ooo) Norris Lake Frequent High 29.7 28.7 30 1.7 Frequent Low 27.7 26.7 120 7.6 – – (ppp) North Como Park Putnam Frequent High 41.3 40.4 Seasonally Flooded – – Average 39.7 38.8 Typically Saturated – – Frequent Low 38.5 37.6 Semipermanently Flooded – – (qqq) North Talmadge Volusia Frequent High 55.6 54.5 Seasonally Flooded – – Average 54.4 53.3 Typically Saturated – – Frequent Low 52.9 51.9 Semipermanently Flooded – – (rrr) Omega Putnam Frequent High 57.4 56.3 Temporarily Flooded – – Average 56.1 55.0 Typically Saturated – – Frequent Low 54.0 52.9 Semipermanently Flooded – – (sss) Orio Putnam Frequent High 37.1 35.5 Seasonally Flooded – – Average 35.6 34.6 Typically Saturated – – Frequent Low 34.7 33.7 Semipermanently Flooded – – (ttt) Pam Putnam Frequent High 39.3 38.2 Seasonally Flooded – – Average 37.5 36.4 Typically Saturated – – Frequent Low 36.1 35.0 Semipermanently Flooded – – (uuu) Pearl Orange Frequent High 53.5 52.5 Seasonally Flooded – – Average 52.6 51.6 Typically Saturated – – Frequent Low 51.2 50.2 Semipermanently Flooded – – (vvv) Pierson Volusia Frequent High 34.4 33.3 Seasonally Flooded – – Average 33.8 32.8 Typically Saturated – – Frequent Low 32.4 31.3 Semipermanently Flooded – – (www) Pine Island Lake Frequent High 107.7 106.6 Seasonally Flooded – – Average 106.8 105.7 Typically Saturated – – Frequent Low 105.4 104.3 Semipermanently Flooded – – (xxx) Prevatt Orange Frequent High 56.0 54.9 Seasonally Flooded – – Average 53.0 52.0 Typically Saturated – – Frequent Low 50.9 49.9 Semipermanently Flooded – – (yyy) Prior Putnam Frequent High 42.3 41.3 Seasonally Flooded – – Average 40.0 39.0 Typically Saturated – – Frequent Low 39.0 38.0 Semipermanently Flooded – – (zzz) Purdom Volusia Frequent High 36.3 35.3 30 2 Average 35.4 34.3 180 1.7 Frequent Low 34.4 33.3 120 5 (aaaa) Sand Putnam Frequent High 40.9 39.4 Seasonally Flooded – – Average 39.0 38.0 Typically Saturated – – Frequent Low 36.6 35.7 Semipermanently Flooded – – (bbbb) Sand Hill Clay Frequent High 132.0 130.9 Seasonally Flooded – – Average 131.6 130.6 Typically Saturated – – Frequent Low 129.5 128.4 Semipermanently Flooded – – (cccc) Savannah Volusia Frequent High 31.1 30.2 Seasonally Flooded – – Average 29.5 28.4 Typically Saturated – – Frequent Low 28.0 27.0 Semipermanently Flooded – – (dddd) Scoggin Volusia Frequent High 35.0 34.0 Seasonally Flooded – – Average 34.1 33.1 Typically Saturated – – Frequent Low 32.7 31.7 Semipermanently Flooded – – (eeee) Shaw Volusia Frequent High 36.7 35.7 – 30 3 Average 35.4 34.4 – 180 1.7 Frequent Low 33.7 32.7 – 120 3 (ffff) Silver Putnam Frequent High 36.8 35.8 Seasonally Flooded – – Average 35.1 34.1 Typically Saturated – – Frequent Low 33.7 32.7 Semipermanently Flooded – – (gggg) Smith Marion Frequent High 54.6 53.6 Temporarily Flooded – – Average 51.4 50.4 Typically Saturated – – Frequent Low 50.0 49.0 Semipermanently Flooded – – (hhhh) South Brevard Frequent High 16.7 15.5 Temporarily Flooded – – Average 15.3 14.0 Typically Saturated – – Frequent Low 13.8 12.6 Semipermanently Flooded – – (iiii) South Como Park Putnam Frequent High 38.1 37.2 Seasonally Flooded – – Average 36.7 35.8 Typically Saturated – – Frequent Low 35.3 34.4 Semipermanently Flooded – – (jjjj) Star Putnam Frequent High 77.5 76.5 Seasonally Flooded – – Average 75.4 74.4 Typically Saturated – – Frequent Low 74.0 73.0 Semipermanently Flooded – – (kkkk) Stella Putnam Frequent High 39.4 38.4 Seasonally Flooded – – Average 38.6 37.6 Typically Saturated – – Frequent Low 37.2 36.1 Semipermanently Flooded – – (llll) Sunset Lake Frequent High 85.9 84.9 Temporarily Flooded – – Average 83.5 82.4 Typically Saturated – – Frequent Low 81.0 79.9 Semipermanently Flooded – – (mmmm) Swan Putnam Frequent High 93.0 91.9 Temporarily Flooded – – Average 90.3 89.2 Typically Saturated – – (nnnn) Sylvan Seminole Frequent High 40.4 39.5 Seasonally Flooded – – Average 38.9 38.0 Typically Saturated – – Frequent Low 37.5 36.5 Semipermanently Flooded – – (oooo) Tarhoe Putnam Frequent High 36.6 35.7 30 3 Average 35.1 34.2 180 1.7 Frequent Low 33.0 32.0 120 5 (pppp) Three Island Lakes Volusia Frequent High 23.7 22.7 – 30 5 Frequent Low 19.4 18.4 – 120 10 (qqqq) Trone Putnam Frequent High 37.1 36.2 – 30 3 Average 35.4 34.5 – 180 1.7 Frequent Low 32.8 31.9 – 120 5 (rrrr) Trout Volusia Frequent High 23.3 22.3 Seasonally Flooded – – Average 20.9 20.0 Typically Saturated – – Frequent Low 17.7 16.8 Semipermanently Flooded – – (ssss) Tuscawilla Alachua Frequent High 77.6 76.4 Seasonally Flooded – – Average 74.6 73.4 Typically Saturated – – Frequent Low 73.2 72.0 Semipermanently Flooded – – (tttt) Upper Lake Louise Volusia Frequent High 35.3 34.4 Seasonally Flooded – – Average 34.6 33.6 Typically Saturated – – Frequent Low 33.2 32.2 Semipermanently Flooded – – (uuuu) Washington Brevard Frequent High 15.6 14.2 Seasonally Flooded – – Average 14.2 12.8 Typically Saturated – – Frequent Low 12.8 11.4 Semipermanently Flooded – – (vvvv) Wauberg Alachua Frequent High 67.4 66.4 Seasonally Flooded – – Average 67.1 66.1 Typically Saturated – – Frequent Low 65.6 64.7 Semipermanently Flooded – – (wwww) Weir Marion Frequent High 57.2 56.2 Seasonally Flooded – – Average 56.4 55.4 Typically Saturated – – Frequent Low 54.9 53.9 Semipermanently Flooded – – (xxxx) Winnemisett Volusia Frequent High 59.5 58.5 Seasonally Flooded – – Average 57.8 56.8 Typically Saturated – – Frequent Low 56.0 55.0 Semipermanently Flooded – – (yyyy) Winona Volusia Frequent High 36.1 35.1 Seasonally Flooded – – Average 33.5 32.5 Typically Saturated – – Frequent Low 32.0 31.0 Semipermanently Flooded – – (5) The following minimum surface water levels are established as exceedance percentiles: 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 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 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 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 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 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 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 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 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 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 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. (6)(a) The minimum flow for Alexander Springs in Lake County is 95.7 cubic feet per second (CFS). (b) The minimum flow for Alexander Springs is a mean annual flow based on the adjusted flow times-series data (1983 – 2014) at USGS gage 00291896. This adjusted flow-time series data from 1983 to 2014, effective 6-29-17, is incorporated by reference and available at http://www.flrules.org/Gateway/reference.asp?No=Ref-08325, 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): (a) The minimum average level, calculated as the long term mean of BCWMA water levels, is 24.0 feet NGVD (22.5 feet NAVD). Water levels shall be at or above this level at least 75% of time over the long term. (b) The minimum frequent low is 23.0 feet NGVD (21.5 feet NAVD). The daily BCWMA water level shall not fall to this level or below more often than once every 2.5 years over the long term. (c) The minimum infrequent low is 22.5 feet NGVD (21.0 feet NAVD). The BCWMA water level shall not fall to this level or below for 60 continuous days more frequently than once every 10 years over the long term. (8)(a) The minimum spring flow for De Leon Springs in Volusia County is 25.6 Cubic feet per second (CFS). (b) The minimum spring flow for De Leon Springs is a mean annual flow based on the baseline flow-time series data from 1965 to 2015 under the 2010-pumping condition (Baseline Flow), which data is incorporated by reference and available at http://www.flrules.org/Gateway/reference.asp?No=Ref-07783, and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529. The minimum spring flow for De Leon Springs is equal to the Baseline Flow as defined above. (9)(a) The minimum flow for Gemini Springs in Volusia County is 9.3 cubic feet per second (CFS). (b) The minimum spring flow for Gemini Springs is a mean annual flow based on the adjusted flow times-series data (1995 – 2015) at USGS gage 00410494. This adjusted flow-time series data from 1995 to 2015, effective 6-29-17, is incorporated by reference and available at http://www.flrules.org/Gateway/reference.asp?No=Ref-08326, and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529. (10)(a) The minimum flow for Silver Glen Springs in Marion/Lake Counties is 99.6 cubic feet per second (CFS). (b) The minimum flow for Silver Glen Springs is a mean annual flow based on the adjusted flow times-series data (1984 – 2015) at USGS gage 02236160. This adjusted flow-time series data from 1984 to 2015, effective 6-29-17, is incorporated by reference and available at http://www.flrules.org/Gateway/reference.asp?No=Ref-08327, and upon request from the St. Johns River Water Management District, 4049 Reid Street, Palatka, FL 32177-2529. (11) The following minimum surface water flows and levels are established for Silver Springs in Marion County, as measured at the USGS 02239501 gaging station: 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. (12) Ground or surface water withdrawals or surface water works must not cause the infrequent high or frequent high surface water flows and levels to occur less frequently or for at lesser duration than stated. Ground or surface water withdrawals or surface water works must not cause the minimum average, frequent low, or infrequent low surface water levels and flows to occur more frequently or for longer durations than stated. (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. (c) This subsection shall not apply within the Central Florida Water Initiative Area, as defined in paragraph 373.0465(2)(a), F.S. (2016).