Gem (Seminole County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°38'45", Longitude 81°12'23"
Period of record: 17 sampling dates; April 28, 1995 to November 29, 1999
Surface area (Shafer et al. 1986): 9 acres / 4 hectacres
Lake Region (Griffith et al. 1997): Crescent City/DeLand Ridges
Geologic formation (Brooks 1981):
The geology is dominated by coastal sand and shelly silty sand of the preglacial Pleistocene.
Physiographic region (Brooks 1981):
The water body lies in the Casselberry-Oviedo-Geneva-Chuluota Hills 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Supplemental, unpublished water chemistry data, University of Florida.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 |
6.3 |
Sulfate (mg/L) |
2.2 |
|
Total alkalinity (mg/L as CaCO3) |
9.4 |
Calcium (mg/L) |
4.4 |
|
Conductance (µS/cm @ 25 °C) |
101 |
Magnesium (mg/L) |
2.1 |
|
Color (Pt-Co units) |
96 |
Sodium (mg/L) |
8.7 |
|
Chloride (mg/L) |
19.3 |
Potassium (mg/L) |
3.7 |
|
Silicon (mg/L) |
2.7 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 17 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
3 |
8 |
13 |
|
Long-term total nitrogen concentrations (µg/L) |
210 |
290 |
430 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
3.8 |
9.0 |
|
Long-term Secchi depth (ft) |
4.1 |
7.6 |
9.7 |
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 |
6 |
230 |
1.7 |
7.5 |
|
Mar-22-99 |
8 |
310 |
1.3 |
9.7 |
|
Apr-14-99 |
8 |
280 |
2.0 |
9.4 |
|
May-14-99 |
8 |
240 |
2.7 |
9.3 |
|
Jun-14-99 |
8 |
360 |
4.0 |
7.7 |
|
Jul-12-99 |
7 |
320 |
3.0 |
7.0 |
|
Aug-13-99 |
5 |
430 |
4.0 |
7.3 |
|
Sep-22-99 |
9 |
270 |
3.0 |
8.8 |
|
Oct-22-99 |
9 |
220 |
7.0 |
6.2 |
|
Nov-29-99 |
8 |
220 |
4.0 |
6.8 |
|
|
|
|
|
|
|
1999 Average |
8 |
290 |
3.3 |
8.0 |