Rowena (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°34'15", Longitude 81°21'37"
Period of record: 58 sampling dates; January 23, 1991 to September 30, 1999
Surface area (Shafer et al. 1986): 57 acres / 23 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.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 2 months sampled:
|
pH |
8.2 |
Sulfate (mg/L) |
11.5 |
|
Total alkalinity (mg/L as CaCO3) |
48.8 |
Calcium (mg/L) |
19.0 |
|
Conductance (µS/cm @ 25 °C) |
173 |
Magnesium (mg/L) |
3.0 |
|
Color (Pt-Co units) |
15 |
Sodium (mg/L) |
8.5 |
|
Chloride (mg/L) |
16.0 |
Potassium (mg/L) |
2.0 |
|
Silicon (mg/L) |
0.7 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 58 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
22 |
43 |
78 |
|
Long-term total nitrogen concentrations (µg/L) |
440 |
800 |
1650 |
|
Long-term total chlorophyll concentrations (µg/L) |
5.7 |
27.0 |
159.3 |
|
Long-term Secchi depth (ft) |
1.7 |
3.4 |
10.3 |
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-17-99 |
30 |
510 |
13.7 |
4.2 |
|
May-02-99 |
39 |
850 |
18.3 |
3.0 |
|
Jun-18-99 |
27 |
800 |
13.7 |
3.0 |
|
Aug-19-99 |
38 |
870 |
34.7 |
3.2 |
|
Sep-30-99 |
32 |
680 |
28.7 |
2.8 |
|
|
|
|
|
|
|
1999 Average |
33 |
740 |
21.8 |
3.2 |
Rowena (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 17, 1992
|
Percent area covered with aquatic vegetation (PAC, %) |
20 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
6 |
|
Average emergent plant biomass (kg wet wt/m2) |
4.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.6 |
|
Average submersed plant biomass (kg wet wt/m2) |
7.5 |
|
Average width of emergent and floating-leaved zone (ft.) |
18 |
|
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 |
80 |
|
hydrilla |
Hydrilla verticillata |
70 |
|
cat-tail |
Typha spp. |
50 |
|
elephant-ear |
Colocasia esculenta |
50 |
|
alligator-weed |
Alternanthera philoxeroides |
40 |
|
maidencane |
Panicum hemitomon |
30 |
|
para grass |
Brachiaria mutica |
30 |
|
spatterdock |
Nuphar luteum |
20 |
|
red ludwigia |
Ludwigia repens |
20 |
|
water-pennywort |
Hydrocotyle umbellata |
20 |
|
water primrose |
Ludwigia octovalvis |
20 |
|
torpedograss |
Panicum repens |
20 |
|
duck-potato |
Sagittaria lancifolia |
10 |
|
fragrant water-lily |
Nymphaea odorata |
10 |
|
dwarf arrowhead |
Sagittaria subulata |
10 |
|
coontail |
Ceratophyllum demersum |
10 |
|
southern naiad |
Najas guadalupensis |
10 |
|
variableleaf pondweed |
Potamogeton diversifolius |
10 |
|
flat-sedge |
Cyperus odoratus |
10 |
|
giant bulrush |
Scirpus californicus |
10 |