Todd (Citrus County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°56'31", Longitude 82°22'18"

Period of record: 56 sampling dates; August 23, 1991 to December 29, 1999

Surface area (LAKEWATCH): 205 acres / 83 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 Tsala Apopka Basin division of the Ocala Uplift District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 1 month sampled:
 
pH
7.1
 Sulfate (mg/L)
0.2
Total alkalinity (mg/L as CaCO3)
38.7
 Calcium (mg/L)
15.0
Conductance (µS/cm @ 25 °C)
119
 Magnesium (mg/L)
1.3
Color (Pt-Co units)
40
 Sodium (mg/L)
7.0
Chloride (mg/L)
14.4
 Potassium (mg/L)
0.5
Silicon (mg/L)
0.9
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 56 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
5
11
17
Long-term total nitrogen concentrations (µg/L)
550
730
910
Long-term total chlorophyll concentrations (µg/L)
1.3
4.8
12.3
Long-term Secchi depth (ft)
4.3
7.1
10.0

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
Jul-27-99
14
790
4.7
8.3
Aug-25-99
12
700
4.7
8.3
Sep-23-99
12
760
5.3
5.7
Oct-27-99
9
770
4.0
5.3
Nov-24-99
10
650
3.3
6.0
Dec-29-99
11
670
2.7
7.0
         
1999 Average
11
720
4.1
6.8

 

Todd (Citrus County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 23, 1992

Percent area covered with aquatic vegetation (PAC, %)
88
Percent of lake's volume filled with vegetation (PVI, %)
35
Average emergent plant biomass (kg wet wt/m2)
3.0
Average floating-leaved plant biomass (kg wet wt/m2)
8.2
Average submersed plant biomass (kg wet wt/m2)
8.7
Average width of emergent and floating-leaved zone (ft.)
675
Average lake depth (m)
2

 

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

Common Name Plant Species
Frequency (%)
spatterdock Nuphar luteum
80
maidencane Panicum hemitomon
80
Illinois pondweed Potamogeton illinoensis
70
bladderwort Utricularia foliosa
70
. Nitella prolonga
70
fragrant water-lily Nymphaea odorata
60
variable-leaf milfoil Myriophyllum heterophyllum
60
purple fanwort Cabomba pulcherrima
60
sawgrass Cladium jamaicense
60
duck-potato Sagittaria lancifolia
50
water-pennywort Hydrocotyle umbellata
50
slender spikerush Eleocharis baldwinii
40
water primrose Ludwigia octovalvis
40
banana-lily Nymphoides aquatica
30
pickerelweed Pontederia cordata
30
lemon bacopa Bacopa caroliniana
30
purple bladderwort Utricularia purpurea
30
red root Lachnanthes caroliniana
30
cat-tail Typha spp.
20
tapegrass Vallisneria americana
20
southern naiad Najas guadalupensis
20
jointed flat sedge Cyperus haspan
20
floating water-hyacinth Eichhornia crassipes
10
red ludwigia Ludwigia repens
10
smartweed Polygonum hydropiperoides
10
coontail Ceratophyllum demersum
10
cone-spur bladderwort Utricularia gibba
10
buttonbush Cephalanthus occidentalis
10
southern water-grass Hydrochloa caroliniensis
10
torpedograss Panicum repens
10
water spikerush Eleocharis elongata
10
knot grass Paspalum distichum
10
rush spp. Juncus dichotomus
10

 

Todd (Citrus County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 2, 1996

Percent area covered with aquatic vegetation (PAC, %)
94
Percent of lake's volume filled with vegetation (PVI, %)
63
Average emergent plant biomass (kg wet wt/m2)
3.4
Average floating-leaved plant biomass (kg wet wt/m2)
3.8
Average submersed plant biomass (kg wet wt/m2)
6.5
Average width of emergent and floating-leaved zone (ft.)
2740
Average lake depth (m)
3

 

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

Common Name Plant Species
Frequency (%)
fragrant water-lily Nymphaea odorata
100
spatterdock Nuphar luteum
90
purple bladderwort Utricularia purpurea
90
sawgrass Cladium jamaicense
90
bladderwort Utricularia foliosa
90
pickerelweed Pontederia cordata
80
cone-spur bladderwort Utricularia gibba
80
purple fanwort Cabomba pulcherrima
80
water-pennywort Hydrocotyle umbellata
70
hydrilla Hydrilla verticillata
70
maidencane Panicum hemitomon
70
duck-potato Sagittaria lancifolia
60
slender spikerush Eleocharis baldwinii
60
lemon bacopa Bacopa caroliniana
60
variable-leaf milfoil Myriophyllum heterophyllum
60
red root Lachnanthes caroliniana
60
common salvinia Salvinia rotundifolia
40
buttonbush Cephalanthus occidentalis
40
yellow-eyed grass Xyris spp.
40
smartweed Polygonum hydropiperoides
30
cat-tail Typha spp.
30
wax myrtle Myrica cerifera
30
willow Salix spp.
30
coontail Ceratophyllum demersum
20
Illinois pondweed Potamogeton illinoensis
20
water primrose Ludwigia octovalvis
20
bald cypress Taxodium distichum
20
. Nitella prolonga
20
water-lettuce Pistia stratiotes
10
alligator-weed Alternanthera philoxeroides
10
water spinach Ipomoea aquatica
10
banana-lily Nymphoides aquatica
10
water-shield Brasenia schreberi
10
American lotus Nelumbo lutea
10
sedge family Cyperaceae
10
southern cutgrass Leersia hexandra
10

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