Rock (Seminole County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°42'14", Longitude 81°22'5"
Period of record: 87 sampling dates; December 1, 1991 to December 30, 1999
Surface area (Shafer et al. 1986): 19 acres / 8 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Supplemental, unpublished water chemistry data, University of Florida.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 |
7.0 |
Sulfate (mg/L) |
10.3 |
|
Total alkalinity (mg/L as CaCO3) |
6.3 |
Calcium (mg/L) |
4.4 |
|
Conductance (µS/cm @ 25 °C) |
121 |
Magnesium (mg/L) |
2.3 |
|
Color (Pt-Co units) |
13 |
Sodium (mg/L) |
12.0 |
|
Chloride (mg/L) |
23.9 |
Potassium (mg/L) |
0.9 |
|
Silicon (mg/L) |
0.1 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 87 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
6 |
9 |
17 |
|
Long-term total nitrogen concentrations (µg/L) |
350 |
490 |
650 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
3.8 |
8.3 |
|
Long-term Secchi depth (ft) |
6.5 |
10.6 |
13.9 |
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-02-99 |
10 |
500 |
2.0 |
. |
|
Jan-30-99 |
8 |
620 |
2.0 |
12.0 |
|
Feb-25-99 |
17 |
600 |
8.0 |
8.0 |
|
Mar-28-99 |
10 |
440 |
1.3 |
. |
|
May-02-99 |
10 |
550 |
2.0 |
10.5 |
|
May-31-99 |
7 |
600 |
2.3 |
. |
|
Jun-30-99 |
11 |
480 |
4.0 |
8.5 |
|
Jul-27-99 |
12 |
550 |
4.7 |
7.5 |
|
Aug-26-99 |
10 |
580 |
4.3 |
7.0 |
|
Sep-30-99 |
11 |
550 |
3.7 |
7.5 |
|
Oct-27-99 |
9 |
550 |
4.7 |
6.8 |
|
Nov-26-99 |
10 |
490 |
3.7 |
9.0 |
|
Dec-30-99 |
10 |
620 |
3.0 |
9.5 |
|
|
|
|
|
|
|
1999 Average |
10 |
550 |
3.5 |
8.6 |