North Twin (Putnam County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 29°36'36", Longitude 82°1'7"
Period of record: 103 sampling dates; September 2, 1990 to August 22, 1999
Surface area (Shafer et al. 1986): 27 acres / 11 hectacres
Lake Region (Griffith et al. 1997): Trail Ridge
Geologic formation (Brooks 1981):
The geology is dominated by quartz sand and quartzite gravel with sandy clay beds of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the Perched Lake and Prairies and Interlachen Sand Hills divisions of the Central Lake District (Brooks 1981)
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 2 months sampled:
|
pH |
6.8 |
Sulfate (mg/L) |
5.2 |
|
Total alkalinity (mg/L as CaCO3) |
4.9 |
Calcium (mg/L) |
2.0 |
|
Conductance (µS/cm @ 25 °C) |
43 |
Magnesium (mg/L) |
1.0 |
|
Color (Pt-Co units) |
9 |
Sodium (mg/L) |
5.0 |
|
Chloride (mg/L) |
8.0 |
Potassium (mg/L) |
0.2 |
|
Silicon (mg/L) |
0.4 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 103 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
5 |
11 |
21 |
|
Long-term total nitrogen concentrations (µg/L) |
210 |
410 |
650 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
4.2 |
13.3 |
|
Long-term Secchi depth (ft) |
5.7 |
9.9 |
17.0 |
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-23-99 |
9 |
270 |
2.0 |
10.7 |
|
Feb-27-99 |
7 |
280 |
1.3 |
10.7 |
|
Mar-20-99 |
6 |
220 |
2.0 |
10.7 |
|
Mar-27-99 |
8 |
250 |
1.7 |
10.0 |
|
Apr-24-99 |
9 |
270 |
2.3 |
10.7 |
|
May-16-99 |
11 |
350 |
3.7 |
10.3 |
|
Jun-28-99 |
9 |
300 |
3.0 |
7.7 |
|
Jul-31-99 |
7 |
320 |
3.0 |
8.7 |
|
Aug-22-99 |
9 |
270 |
2.3 |
10.0 |
|
|
|
|
|
|
|
1999 Average |
9 |
280 |
2.4 |
9.9 |