(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) Apshawa North
Lake
Frequent High
85.0
83.9
Seasonally Flooded
–
–
    

Average
83.3
82.2
Typically Saturated
–
–
    

Frequent Low
81.3
80.2
Semipermanently Flooded
–
–
    (b) Apshawa South
Lake
Frequent High
86.0
85.7
Seasonally Flooded
–
–
    

Average
84.7
83.6
Typically Saturated
–
–
    

Frequent Low
83.2
82.1
Semipermanently Flooded
–
–
    (c) 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
–
–
    (d) Ashby
Volusia
Frequent High
12.3
11.3
–
60
2
    

Frequent Low
11.1
10.2
–
120
5
    (e) 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
    (f) 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
–
–
    (g) 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
–
–
    (h) 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
–
–
    (i) 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
–
–
    (j) 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
–
–
    (k) 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
–
–
    (l) 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
–
–
    (m) 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
–
–
    (n) 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
–
–
    (o) 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
–
–
    (p) 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
–
–
    (q) 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
–
–
    (r) Colby
Volusia
Frequent High
27.6
26.6
–
30
3
    

Frequent Low
22.9
21.8
–
120
3
    (s) 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
    (t) 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
    (u) 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
–
–
    (v) 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
    (w) 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
–
–
    (x) 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
–
–
    (y) 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
–
–
    (z) 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
–
–
    (aa) 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
–
–
    (bb) 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
–
–
    (cc) 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
–
–
    (dd) 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
–
–
    (ee) 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
–
–
    (ff) 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
–
–
    (gg) 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
–
–
    (hh) 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
–
–
    (ii) 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
–
–
    (jj) 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
–
–
    (kk) 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
–
–
    (ll) 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
–
–
    (mm) 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
–
–
    (nn) 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
    (oo) Grandin
Putnam
Frequent High
81.5
80.7
–
30
2
    

Frequent Low
78.6
77.8
–
120
5
    (pp) 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
–
–
    (qq) 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
–
–
    (rr) 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
–
–
    (ss) 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
–
–
    (tt) 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
–
–
    (uu) 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
–
–
    (vv) 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

    (ww) 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
    (xx) 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
–
–
    (yy) 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
    (zz) 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
–
–
    (aaa) 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
–
–
    (bbb) 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
–
–
    (ccc) 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
–
–
    (ddd) 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
–
–
    (eee) 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
–
–
    (fff) 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
–
–
    (ggg) 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
–
–
    (hhh) 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
–
–
    (iii) 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
–
–
    (jjj) 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
–
–
    (kkk) 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
    (lll) 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
–
–
    (mmm) 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
–
–
    (nnn) 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
    (ooo) 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
–
–
    (ppp) 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
–
–
    (qqq) Norris
Lake
Frequent High
29.7
28.7

30
1.7
    

Frequent Low
27.7
26.7

120
7.6
    

–
–
    (rrr) 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
–
–
    (sss) 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
–
–
    (ttt) 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
–
–
    (uuu) 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
–
–
    (vvv) 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
–
–
    (www) 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
–
–
    (xxx) 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
–
–
    (yyy) 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
–
–
    (zzz) 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
–
–
    (aaaa) 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
–
–
    (bbbb) 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
    (cccc) 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
–
–
    (dddd) 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
–
–
    (eeee) 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
–
–
    (ffff) 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
–
–
    (gggg) 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
    (hhhh) 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
–
–
    (iiii) 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
–
–
    (jjjj) 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
–
–
    (kkkk) 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
–
–
    (llll) 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
–
–
    (mmmm) 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
–
–
    (nnnn) 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
–
–
    (oooo) Swan
Putnam
Frequent High
93.0
91.9
Temporarily Flooded
–
–

Average
90.3
89.2
Typically Saturated
–
–
    (pppp) 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
–
–
    (qqqq) 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
    (rrrr) Three Island Lakes
Volusia
Frequent High
23.7
22.7
–
30
5
    

Frequent Low
19.4
18.4
–
120
10
    (ssss) 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
    (tttt) 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
–
–
    (uuuu) 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
–
–
    (vvvv) 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
–
–
    (wwww) 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
–
–
    (xxxx) 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
–
–
    (yyyy) 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
–
–
    (zzzz) 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
–
–
    (aaaaa) 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)
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 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).
Rulemaking Authority 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.