Rock (Hillsborough County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°6'50", Longitude 82°33'24"
Period of record: 24 sampling dates; January 10, 1998 to December 12, 1999
Surface area (Shafer et al. 1986): 53 acres / 21 hectacres
Lake Region (Griffith et al. 1997): Tampa Plain
Geologic formation (Brooks 1981):
The geology is dominated by argillaceous to sandy impure limestone of the Tampa Formation.
Physiographic region (Brooks 1981):
The water body lies in the Land-O-Lakes subdivision of the Tampa Plain division of the Ocala Uplift District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
6.8 |
Sulfate (mg/L) |
7.0 |
|
Total alkalinity (mg/L as CaCO3) |
13.0 |
Calcium (mg/L) |
8.2 |
|
Conductance (µS/cm @ 25 °C) |
125 |
Magnesium (mg/L) |
1.7 |
|
Color (Pt-Co units) |
98 |
Sodium (mg/L) |
11.0 |
|
Chloride (mg/L) |
28.0 |
Potassium (mg/L) |
3.4 |
|
Silicon (mg/L) |
1.4 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 24 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
24 |
41 |
76 |
|
Long-term total nitrogen concentrations (µg/L) |
660 |
850 |
1280 |
|
Long-term total chlorophyll concentrations (µg/L) |
2.3 |
14.3 |
38.3 |
|
Long-term Secchi depth (ft) |
2.0 |
3.5 |
5.1 |
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-09-99 |
29 |
760 |
8.7 |
3.0 |
|
Feb-06-99 |
30 |
730 |
14.0 |
3.6 |
|
Mar-13-99 |
26 |
730 |
7.0 |
3.9 |
|
Apr-11-99 |
27 |
780 |
8.7 |
3.8 |
|
May-08-99 |
28 |
760 |
11.0 |
4.4 |
|
Jun-12-99 |
28 |
770 |
10.7 |
4.9 |
|
Jul-10-99 |
31 |
920 |
29.0 |
3.8 |
|
Aug-07-99 |
25 |
890 |
30.0 |
4.2 |
|
Sep-04-99 |
24 |
830 |
14.0 |
5.1 |
|
Oct-09-99 |
53 |
1170 |
14.0 |
2.1 |
|
Nov-07-99 |
49 |
1280 |
10.7 |
2.0 |
|
Dec-12-99 |
37 |
1120 |
18.0 |
3.8 |
|
|
|
|
|
|
|
1999 Average |
32 |
900 |
14.6 |
3.7 |