Hernando (Citrus County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°54'22", Longitude 82°22'12"

Period of record: 35 sampling dates; August 23, 1991 to December 21, 1999

Surface area (LAKEWATCH): 442 acres / 179 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Tsala Apopka

Geologic formation (Brooks 1981):

The geology is a mixture of two major types dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation and limestone consisting of skeletons of fossils in a silt to sand size matrix of the Ocala Limestone Formation.

Physiographic region (Brooks 1981):

The water body lies in the Hernando Hammock and Tsala Apopka Basin divisions of the Ocala Uplift District.

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 4 months sampled:
 
pH
7.4
 Sulfate (mg/L)
3.7
Total alkalinity (mg/L as CaCO3)
42.0
 Calcium (mg/L)
16.6
Conductance (µS/cm @ 25 °C)
115
 Magnesium (mg/L)
4.6
Color (Pt-Co units)
28
 Sodium (mg/L)
5.8
Chloride (mg/L)
10.4
 Potassium (mg/L)
0.3
Silicon (mg/L)
0.8
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 35 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
7
12
18
Long-term total nitrogen concentrations (µg/L)
480
650
820
Long-term total chlorophyll concentrations (µg/L)
2.0
4.5
8.0
Long-term Secchi depth (ft)
5.8
7.4
9.3

1999 Florida LAKEWATCH Data

Numbers reported below are monthly averages calculated from 3 stations for total phosphorus (TP, µg/L), total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1999:

Date
TP (µg/L)
TN (µg/L)
CHL (µg/L)
SECCHI (ft
Jan-08-99
12
630
4.5
7.3
Feb-10-99
15
640
6.7
7.0
Mar-11-99
13
640
4.3
7.7
Apr-19-99
16
680
4.7
6.0
May-10-99
16
700
4.7
9.3
Jun-11-99
13
710
3.3
8.0
Jul-08-99
15
740
5.3
8.7
Aug-25-99
13
730
6.0
8.0
Sep-23-99
16
780
8.0
6.7
Oct-27-99
15
730
4.3
6.0
Nov-24-99
15
720
5.3
8.0
Dec-21-99
14
720
4.7
6.7
         
1999 Average
14
700
5.2
7.4

Hernando (Citrus County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 24, 1992

Percent area covered with aquatic vegetation (PAC, %)
96
Percent of lake's volume filled with vegetation (PVI, %)
58
Average emergent plant biomass (kg wet wt/m2)
4.4
Average floating-leaved plant biomass (kg wet wt/m2)
10.4
Average submersed plant biomass (kg wet wt/m2)
15.1
Average width of emergent and floating-leaved zone (ft.)
356
Average lake depth (m)
2

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
cat-tail Typha spp.
90
spatterdock Nuphar luteum
80
maidencane Panicum hemitomon
80
. Nitella prolonga
80
fragrant water-lily Nymphaea odorata
70
variable-leaf milfoil Myriophyllum heterophyllum
70
knot grass Paspalum distichum
70
bladderwort Utricularia foliosa
70
tapegrass Vallisneria americana
60
Illinois pondweed Potamogeton illinoensis
60
duck-potato Sagittaria lancifolia
50
purple bladderwort Utricularia purpurea
50
green fanwort Cabomba caroliniana var. multipartita
50
lemon bacopa Bacopa caroliniana
40
hydrilla Hydrilla verticillata
40
southern naiad Najas guadalupensis
40
willow Salix spp.
40
American lotus Nelumbo lutea
20
pickerelweed Pontederia cordata
10
water-pennywort Hydrocotyle umbellata
10
coontail Ceratophyllum demersum
10
cone-spur bladderwort Utricularia gibba
10
water primrose Ludwigia octovalvis
10
buttonbush Cephalanthus occidentalis
10
sawgrass Cladium jamaicense
10
torpedograss Panicum repens
10

Hernando (Citrus County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 2, 1996

Percent area covered with aquatic vegetation (PAC, %)
90
Percent of lake's volume filled with vegetation (PVI, %)
56
Average emergent plant biomass (kg wet wt/m2)
7.2
Average floating-leaved plant biomass (kg wet wt/m2)
4.3
Average submersed plant biomass (kg wet wt/m2)
8.8
Average width of emergent and floating-leaved zone (ft.)
196
Average lake depth (m)
3

Frequency that plant species occur in 16 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
cone-spur bladderwort Utricularia gibba
94
Illinois pondweed Potamogeton illinoensis
94
maidencane Panicum hemitomon
94
fragrant water-lily Nymphaea odorata
88
cat-tail Typha spp.
88
purple bladderwort Utricularia purpurea
81
bladderwort Utricularia foliosa
75
spatterdock Nuphar luteum
69
lemon bacopa Bacopa caroliniana
69
wax myrtle Myrica cerifera
69
pickerelweed Pontederia cordata
62
. Nitella prolonga
62
knot grass Paspalum distichum
56
willow Salix spp.
50
duck-potato Sagittaria lancifolia
44
alligator-weed Alternanthera philoxeroides
44
slender spikerush Eleocharis baldwinii
44
coontail Ceratophyllum demersum
44
variable-leaf milfoil Myriophyllum heterophyllum
44
hydrilla Hydrilla verticillata
44
water-pennywort Hydrocotyle umbellata
38
tapegrass Vallisneria americana
38
water primrose Ludwigia octovalvis
38
purple fanwort Cabomba pulcherrima
31
torpedograss Panicum repens
31
bald cypress Taxodium distichum
31
floating water-hyacinth Eichhornia crassipes
25
American lotus Nelumbo lutea
19
smartweed Polygonum hydropiperoides
19
green fanwort Cabomba caroliniana var. multipartita
19
common salvinia Salvinia rotundifolia
12
banana-lily Nymphoides aquatica
12
red ludwigia Ludwigia repens
12
southern naiad Najas guadalupensis
12
buttonbush Cephalanthus occidentalis
12
stonewort Nitella spp.
12
yellow-eyed grass Xyris spp.
12
water-shield Brasenia schreberi
6
elephant-ear Colocasia esculenta
6
sawgrass Cladium jamaicense
6
water spikerush Eleocharis elongata
6
leconte sedge Cyperus lecontei
6

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