Lurna (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°31'23", Longitude 81°22'27"
Period of record: 47 sampling dates; January 6, 1991 to October 22, 1999
Surface area (Shafer et al. 1986): 8 acres / 3 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Supplemental, unpublished water chemistry data, University of Florida.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 |
8.0 |
Sulfate (mg/L) |
12.3 |
|
Total alkalinity (mg/L as CaCO3) |
64.0 |
Calcium (mg/L) |
25.5 |
|
Conductance (µS/cm @ 25 °C) |
211 |
Magnesium (mg/L) |
3.2 |
|
Color (Pt-Co units) |
19 |
Sodium (mg/L) |
9.0 |
|
Chloride (mg/L) |
15.2 |
Potassium (mg/L) |
2.0 |
|
Silicon (mg/L) |
0.2 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 47 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
48 |
79 |
183 |
|
Long-term total nitrogen concentrations (µg/L) |
520 |
740 |
1280 |
|
Long-term total chlorophyll concentrations (µg/L) |
4.3 |
36.6 |
97.0 |
|
Long-term Secchi depth (ft) |
2.0 |
3.7 |
6.8 |
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-08-99 |
98 |
740 |
6.3 |
6.5 |
|
Mar-08-99 |
79 |
630 |
9.7 |
6.8 |
|
Apr-13-99 |
121 |
710 |
. |
. |
|
Oct-22-99 |
61 |
670 |
36.7 |
4.5 |
|
|
|
|
|
|
|
1999 Average |
90 |
690 |
17.6 |
5.9 |