Jem (Lake County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°44'48", Longitude 81°39'54"
Period of record: 21 sampling dates; September 17, 1997 to December 11, 1999
Surface area (Shafer et al. 1986): 19 acres / 8 hectacres
Lake Region (Griffith et al. 1997): Apopka Upland
Geologic formation (Brooks 1981):
The geology is dominated by deeply weathered clayey sand and granular sand of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the Central Lakes division of the Central Lake District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
7.2 |
Sulfate (mg/L) |
54.7 |
|
Total alkalinity (mg/L as CaCO3) |
16.0 |
Calcium (mg/L) |
17.0 |
|
Conductance (µS/cm @ 25 °C) |
243 |
Magnesium (mg/L) |
6.4 |
|
Color (Pt-Co units) |
10 |
Sodium (mg/L) |
8.0 |
|
Chloride (mg/L) |
21.4 |
Potassium (mg/L) |
9.0 |
|
Silicon (mg/L) |
0.1 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 21 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
8 |
13 |
18 |
|
Long-term total nitrogen concentrations (µg/L) |
430 |
570 |
740 |
|
Long-term total chlorophyll concentrations (µg/L) |
2.7 |
6.2 |
8.0 |
|
Long-term Secchi depth (ft) |
4.5 |
8.1 |
12.8 |
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-16-99 |
13 |
600 |
6.3 |
8.5 |
|
Feb-14-99 |
12 |
540 |
7.0 |
6.6 |
|
Mar-13-99 |
16 |
430 |
5.0 |
8.0 |
|
Apr-18-99 |
13 |
530 |
6.3 |
7.1 |
|
May-17-99 |
15 |
640 |
6.3 |
6.0 |
|
Jun-19-99 |
12 |
630 |
6.3 |
7.0 |
|
Jul-11-99 |
10 |
710 |
5.0 |
9.0 |
|
Nov-21-99 |
15 |
540 |
8.0 |
7.0 |
|
Dec-11-99 |
18 |
610 |
8.0 |
7.2 |
|
|
|
|
|
|
|
1999 Average |
14 |
580 |
6.5 |
7.4 |