Florida Administrative Code
40 - WATER MANAGEMENT DISTRICTS
40C - St. Johns River Water Management District
Chapter 40C-8 - MINIMUM FLOWS AND LEVELS
Section 40C-8.031 - Minimum Surface Water Levels and Flows and Groundwater Levels

Universal Citation: FL Admin Code R 40C-8.031

Current through Reg. 50, No. 187; September 24, 2024

(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.

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.

Disclaimer: These regulations may not be the most recent version. Florida may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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