Formosa (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°34'7", Longitude 81°22'9"
Period of record: 80 sampling dates; March 10, 1991 to December 7, 1999
Surface area (Shafer et al. 1986): 29 acres / 12 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 Orlando Promontory division of the Central Lake District.
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 80 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
21 |
36 |
58 |
|
Long-term total nitrogen concentrations (µg/L) |
370 |
770 |
1850 |
|
Long-term total chlorophyll concentrations (µg/L) |
8.7 |
32.3 |
89.0 |
|
Long-term Secchi depth (ft) |
1.0 |
3.3 |
6.0 |
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-19-99 |
30 |
520 |
16.3 |
6.0 |
|
Feb-09-99 |
21 |
370 |
11.3 |
5.5 |
|
Apr-06-99 |
32 |
570 |
9.3 |
5.8 |
|
May-04-99 |
38 |
730 |
14.0 |
2.7 |
|
May-28-99 |
46 |
1200 |
37.3 |
. |
|
Aug-31-99 |
37 |
790 |
39.7 |
3.0 |
|
Sep-23-99 |
37 |
870 |
50.7 |
2.8 |
|
Oct-05-99 |
28 |
700 |
42.0 |
3.0 |
|
Nov-09-99 |
39 |
850 |
48.0 |
2.3 |
|
Dec-07-99 |
40 |
790 |
42.3 |
3.0 |
|
|
|
|
|
|
|
1999 Average |
35 |
740 |
31.1 |
3.8 |
Formosa (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 17, 1992
|
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) |
2.5 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.4 |
|
Average submersed plant biomass (kg wet wt/m2) |
7.4 |
|
Average width of emergent and floating-leaved zone (ft.) |
12 |
|
Average lake depth (m) |
4 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
tapegrass |
Vallisneria americana |
90 |
|
torpedograss |
Panicum repens |
80 |
|
water-pennywort |
Hydrocotyle umbellata |
70 |
|
hydrilla |
Hydrilla verticillata |
50 |
|
flat-sedge |
Cyperus odoratus |
50 |
|
alligator-weed |
Alternanthera philoxeroides |
30 |
|
pickerelweed |
Pontederia cordata |
30 |
|
giant bulrush |
Scirpus californicus |
20 |
|
duck-potato |
Sagittaria lancifolia |
10 |
|
spatterdock |
Nuphar luteum |
10 |
|
fragrant water-lily |
Nymphaea odorata |
10 |
|
variableleaf pondweed |
Potamogeton diversifolius |
10 |
|
elephant-ear |
Colocasia esculenta |
10 |
|
soft rush |
Juncus effusus |
10 |