Holden (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°30'12", Longitude 81°23'4"
Period of record: 52 sampling dates; February 11, 1990 to December 15, 1999
Surface area (Shafer et al. 1986): 252 acres / 102 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Supplemental, unpublished water chemistry data, University of Florida.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 6 months sampled:
|
pH |
8.5 |
Sulfate (mg/L) |
16.7 |
|
Total alkalinity (mg/L as CaCO3) |
68.6 |
Calcium (mg/L) |
26.2 |
|
Conductance (µS/cm @ 25 °C) |
239 |
Magnesium (mg/L) |
4.3 |
|
Color (Pt-Co units) |
13 |
Sodium (mg/L) |
13.4 |
|
Chloride (mg/L) |
21.0 |
Potassium (mg/L) |
3.7 |
|
Silicon (mg/L) |
0.5 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 52 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
25 |
41 |
61 |
|
Long-term total nitrogen concentrations (µg/L) |
870 |
1250 |
1560 |
|
Long-term total chlorophyll concentrations (µg/L) |
21.3 |
52.8 |
80.7 |
|
Long-term Secchi depth (ft) |
1.3 |
2.1 |
3.0 |
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-29-99 |
39 |
1060 |
80.7 |
2.2 |
|
Feb-23-99 |
41 |
1300 |
49.3 |
2.0 |
|
Mar-18-99 |
46 |
1330 |
52.0 |
1.8 |
|
Apr-22-99 |
51 |
1480 |
53.7 |
1.7 |
|
May-20-99 |
39 |
1390 |
47.0 |
1.6 |
|
Jun-18-99 |
36 |
1220 |
47.3 |
3.0 |
|
Jul-12-99 |
29 |
1210 |
36.0 |
2.3 |
|
Aug-09-99 |
31 |
1260 |
40.3 |
2.3 |
|
Sep-20-99 |
39 |
1510 |
64.0 |
2.3 |
|
Oct-18-99 |
37 |
1360 |
63.7 |
2.2 |
|
Nov-15-99 |
35 |
1440 |
62.0 |
2.4 |
|
Dec-15-99 |
35 |
1450 |
60.3 |
2.3 |
|
|
|
|
|
|
|
1999 Average |
38 |
1340 |
54.7 |
2.2 |
Holden (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 3, 1992
|
Percent area covered with aquatic vegetation (PAC, %) |
0 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
0 |
|
Average emergent plant biomass (kg wet wt/m2) |
2.9 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.0 |
|
Average submersed plant biomass (kg wet wt/m2) |
0.0 |
|
Average width of emergent and floating-leaved zone (ft.) |
5 |
|
Average lake depth (m) |
4 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
torpedograss |
Panicum repens |
40 |
|
smartweed |
Polygonum hydropiperoides |
30 |
|
water-pennywort |
Hydrocotyle umbellata |
30 |
|
water primrose |
Ludwigia octovalvis |
30 |
|
cat-tail |
Typha spp. |
20 |
|
elephant-ear |
Colocasia esculenta |
20 |
|
alligator-weed |
Alternanthera philoxeroides |
10 |
|
willow |
Salix spp. |
10 |
|
rush fuirena |
Fuirena scirpoidea |
10 |