Lorna Doone (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°32'30", Longitude 81°24'12"
Period of record: 91 sampling dates; March 18, 1992 to November 23, 1999
Surface area (Shafer et al. 1986): 14 acres / 6 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 91 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
31 |
47 |
75 |
|
Long-term total nitrogen concentrations (µg/L) |
500 |
780 |
1600 |
|
Long-term total chlorophyll concentrations (µg/L) |
9.7 |
39.0 |
98.0 |
|
Long-term Secchi depth (ft) |
1.5 |
3.6 |
6.3 |
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-29-99 |
39 |
580 |
23.0 |
4.0 |
|
Feb-15-99 |
39 |
500 |
23.3 |
4.7 |
|
Mar-11-99 |
36 |
620 |
17.0 |
4.7 |
|
Apr-30-99 |
39 |
720 |
35.7 |
4.0 |
|
Jun-30-99 |
39 |
740 |
42.3 |
4.0 |
|
Jul-21-99 |
33 |
640 |
24.3 |
4.0 |
|
Aug-23-99 |
38 |
780 |
37.5 |
4.2 |
|
Sep-20-99 |
38 |
770 |
46.0 |
3.5 |
|
Oct-21-99 |
45 |
660 |
39.7 |
3.5 |
|
Nov-23-99 |
39 |
720 |
34.3 |
4.5 |
|
|
|
|
|
|
|
1999 Average |
39 |
670 |
32.3 |
4.1 |
Lorna Doone (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on September 15, 1994
|
Percent area covered with aquatic vegetation (PAC, %) |
14 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
3 |
|
Average emergent plant biomass (kg wet wt/m2) |
2.7 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.0 |
|
Average submersed plant biomass (kg wet wt/m2) |
2.0 |
|
Average width of emergent and floating-leaved zone (ft.) |
13 |
|
Average lake depth (m) |
4 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
alligator-weed |
Alternanthera philoxeroides |
90 |
|
bald cypress |
Taxodium distichum |
80 |
|
pickerelweed |
Pontederia cordata |
60 |
|
water-pennywort |
Hydrocotyle umbellata |
50 |
|
tapegrass |
Vallisneria americana |
50 |
|
giant bulrush |
Scirpus californicus |
50 |
|
torpedograss |
Panicum repens |
40 |
|
hydrilla |
Hydrilla verticillata |
30 |
|
elephant-ear |
Colocasia esculenta |
30 |
|
southern cutgrass |
Leersia hexandra |
20 |
|
lemon bacopa |
Bacopa caroliniana |
10 |
|
water primrose |
Ludwigia octovalvis |
10 |