Little Conway (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°29'26", Longitude 81°21'15"

Period of record: 56 sampling dates; April 22, 1995 to December 16, 1999

Surface area (LAKEWATCH): 914 acres / 370 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Orlando Ridge

Geologic formation (Brooks 1981):

The geology is dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the Orlando Promontory division of the Central Lake District.
 
 

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 1 month sampled:
 
pH
7.6
 Total alkalinity (mg/L as CaCO3)
37.0
Conductance (µS/cm @ 25 °C)
241
 Color (Pt-Co units)
6
Chloride (mg/L)
31.8
    

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)
7
11
15
Long-term total nitrogen concentrations (µg/L)
330
460
620
Long-term total chlorophyll concentrations (µg/L)
1.3
3.8
12.7
Long-term Secchi depth (ft)
7.0
13.7
21.0

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
Jan-16-99
9
440
2.0
17.0
Feb-22-99
12
370
2.0
21.0
Mar-13-99
11
450
2.0
14.0
Apr-14-99
11
480
2.0
14.0
May-16-99
12
420
2.7
10.0
Jun-26-99
11
380
3.0
9.0
Jul-25-99
10
500
4.0
8.3
Aug-29-99
12
610
6.3
7.2
Sep-18-99
14
600
7.7
7.0
Oct-25-99
13
500
5.3
11.0
Nov-11-99
11
500
4.3
14.0
Dec-16-99
13
520
3.0
17.7
         
1999 Average
12
480
3.7
12.5

Little Conway (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 30, 1994

Percent area covered with aquatic vegetation (PAC, %)
44
Percent of lake's volume filled with vegetation (PVI, %)
7
Average emergent plant biomass (kg wet wt/m2)
0.8
Average floating-leaved plant biomass (kg wet wt/m2)
0.1
Average submersed plant biomass (kg wet wt/m2)
1.5
Average width of emergent and floating-leaved zone (ft.)
29
Average lake depth (m)
5

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

Common Name Plant Species
Frequency (%)
Illinois pondweed Potamogeton illinoensis
80
cat-tail Typha spp.
60
tapegrass Vallisneria americana
60
duck-potato Sagittaria lancifolia
50
torpedograss Panicum repens
50
willow Salix spp.
40
maidencane Panicum hemitomon
40
stonewort Nitella spp.
40
fragrant water-lily Nymphaea odorata
30
pickerelweed Pontederia cordata
30
elephant-ear Colocasia esculenta
30
water primrose Ludwigia octovalvis
30
common salvinia Salvinia rotundifolia
20
water-pennywort Hydrocotyle umbellata
20
coontail Ceratophyllum demersum
20
southern naiad Najas guadalupensis
20
musk-grass Chara spp.
20
rush fuirena Fuirena scirpoidea
20
. Nitella prolonga
20
floating water-hyacinth Eichhornia crassipes
10
alligator-weed Alternanthera philoxeroides
10
slender spikerush Eleocharis baldwinii
10
purple bladderwort Utricularia purpurea
10
purple fanwort Cabomba pulcherrima
10
melaleuca Melaleuca quinquenervia
10
sawgrass Cladium jamaicense
10
elderberry Sambucus canadensis
10

Little Conway (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 16, 1999

Percent area covered with aquatic vegetation (PAC, %)
52
Percent of lake's volume filled with vegetation (PVI, %)
13
Average emergent plant biomass (kg wet wt/m2)
2.2
Average floating-leaved plant biomass (kg wet wt/m2)
0.4
Average submersed plant biomass (kg wet wt/m2)
2.6
Average width of emergent and floating-leaved zone (ft.)
78
Average lake depth (m)
4

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

Common Name Plant Species
Frequency (%)
Illinois pondweed Potamogeton illinoensis
90
cat-tail Typha spp.
60
torpedograss Panicum repens
60
tapegrass Vallisneria americana
50
maidencane Panicum hemitomon
50
water primrose Ludwigia octovalvis
40
stonewort Nitella spp.
40
dwarf arrowhead Sagittaria subulata
30
hydrilla Hydrilla verticillata
30
willow Salix spp.
30
duck-potato Sagittaria lancifolia
20
pickerelweed Pontederia cordata
20
rush fuirena Fuirena scirpoidea
20
fragrant water-lily Nymphaea odorata
10
water-pennywort Hydrocotyle umbellata
10
coontail Ceratophyllum demersum
10
purple fanwort Cabomba pulcherrima
10
wax myrtle Myrica cerifera
10
musk-grass Chara spp.
10
jointed flat sedge Cyperus haspan
10

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