Placid (Highlands County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 27°14'33", Longitude 81°21'57"

Period of record: 61 sampling dates; April 22, 1994 to December 20, 1999

Surface area (LAKEWATCH): No data available.    Bathymetric Map

Lake Region (Griffith et al. 1997): Southern Lake Wales Ridge

Geologic formation (Brooks 1981):

The geology is dominated by deeply weathered beach and dune sand with some clay lenses of the preglacial Pleistocene.

Physiographic region (Brooks 1981):

The water body lies in the Eastern Complex of the Central Ridge subdivision of the Lake Wales Ridge division of the Central Lake District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 4 months sampled:
 
pH
6.5
 Sulfate (mg/L)
13.2
Total alkalinity (mg/L as CaCO3)
3.4
 Calcium (mg/L)
2.6
Conductance (µS/cm @ 25 °C)
69
 Magnesium (mg/L)
6.5
Color (Pt-Co units)
6
 Sodium (mg/L)
5.8
Chloride (mg/L)
11.5
 Potassium (mg/L)
1.9
Silicon (mg/L)
0.3
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 61 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
6
13
24
Long-term total nitrogen concentrations (µg/L)
260
380
530
Long-term total chlorophyll concentrations (µg/L)
3.0
7.7
21.0
Long-term Secchi depth (ft)
6.3
9.0
13.2

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-26-99
11
340
8.0
7.0
Feb-25-99
15
410
8.0
7.3
Mar-20-99
12
390
5.0
8.0
May-14-99
12
520
4.3
7.3
Jul-07-99
11
360
4.7
11.7
Aug-15-99
13
350
10.0
9.3
Sep-11-99
15
450
8.7
7.5
Oct-24-99
20
480
12.7
8.0
Nov-15-99
21
460
9.5
8.3
Dec-20-99
19
450
11.7
7.3
         
1999 Average
15
420
8.2
8.2

 

Placid (Highlands County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 11, 1996

Percent area covered with aquatic vegetation (PAC, %)
2
Percent of lake's volume filled with vegetation (PVI, %)
0
Average emergent plant biomass (kg wet wt/m2)
1.8
Average floating-leaved plant biomass (kg wet wt/m2)
0.2
Average submersed plant biomass (kg wet wt/m2)
0.3
Average width of emergent and floating-leaved zone (ft.)
212
Average lake depth (m)
7

Frequency that plant species occur in 30 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
torpedograss Panicum repens
93
maidencane Panicum hemitomon
90
pickerelweed Pontederia cordata
73
water primrose Ludwigia octovalvis
73
cat-tail Typha spp.
63
rush fuirena Fuirena scirpoidea
57
slender spikerush Eleocharis baldwinii
47
wax myrtle Myrica cerifera
47
duck-potato Sagittaria lancifolia
40
melaleuca Melaleuca quinquenervia
40
buttonbush Cephalanthus occidentalis
40
red root Lachnanthes caroliniana
40
water-pennywort Hydrocotyle umbellata
33
sedge spp. Cyperus spp.
33
respuinata bladderwort Utricularia resupinata
30
spatterdock Nuphar luteum
17
red ludwigia Ludwigia repens
17
willow Salix spp.
17
Florida bladderwort Utricularia floridana
17
common salvinia Salvinia rotundifolia
13
variable-leaf milfoil Myriophyllum heterophyllum
13
smartweed Polygonum hydropiperoides
10
Guinea grass Panicum maximum
10
banana-lily Nymphoides aquatica
7
lemon bacopa Bacopa caroliniana
7
bog-moss Mayaca fluviatilis
7
southern naiad Najas guadalupensis
7
para grass Brachiaria mutica
7
St. John's wort Hypericum spp.
7
alligator-weed Alternanthera philoxeroides
3
dwarf arrowhead Sagittaria subulata
3
purple bladderwort Utricularia purpurea
3
giant bulrush Scirpus californicus
3
southern water-grass Hydrochloa caroliniensis
3
yellow-eyed grass Xyris spp.
3
. Juncus coriaceous
3
. Eleocharis spp.
3

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