Fredrica (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°30'29", Longitude 81°18'26"
Period of record: 19 sampling dates; November 21, 1992 to November 6, 1994
Surface area (Shafer et al. 1986): 71 acres / 29 hectacres
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 Holopaw-Indian Town Ridges and Swales division of the Eastern Flatwoods District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
7.6 |
Sulfate (mg/L) |
34.0 |
|
Total alkalinity (mg/L as CaCO3) |
26.0 |
Conductance (µS/cm @ 25 °C) |
178 |
|
Color (Pt-Co units) |
7 |
Chloride (mg/L) |
12.0 |
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 19 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
8 |
13 |
18 |
|
Long-term total nitrogen concentrations (µg/L) |
340 |
440 |
530 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.7 |
4.5 |
8.0 |
|
Long-term Secchi depth (ft) |
8.0 |
10.5 |
13.8 |
Florida LAKEWATCH data were not collected in 1999.
Fredrica (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 22, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
58 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
4 |
|
Average emergent plant biomass (kg wet wt/m2) |
5.6 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.5 |
|
Average submersed plant biomass (kg wet wt/m2) |
5.5 |
|
Average width of emergent and floating-leaved zone (ft.) |
26 |
|
Average lake depth (m) |
4 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
hydrilla |
Hydrilla verticillata |
80 |
|
cat-tail |
Typha spp. |
70 |
|
coontail |
Ceratophyllum demersum |
60 |
|
water primrose |
Ludwigia octovalvis |
60 |
|
torpedograss |
Panicum repens |
60 |
|
. |
Nitella prolonga |
40 |
|
willow |
Salix spp. |
30 |
|
sawgrass |
Cladium jamaicense |
20 |
|
green algae |
Chlorphyta |
20 |
|
bald cypress |
Taxodium distichum |
20 |
|
elderberry |
Sambucus canadensis |
20 |
|
alligator-weed |
Alternanthera philoxeroides |
10 |
|
slender spikerush |
Eleocharis baldwinii |
10 |
|
spatterdock |
Nuphar luteum |
10 |
|
pickerelweed |
Pontederia cordata |
10 |
|
dwarf arrowhead |
Sagittaria subulata |
10 |
|
maidencane |
Panicum hemitomon |
10 |