Doctors (Clay County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 30°8'4", Longitude 81°44'1"
Period of record: 25 sampling dates; October 16, 1996 to November 25, 1999
Surface area (Shafer et al. 1986): No data available.
Lake Region (Griffith et al. 1997): Eastern Flatlands
Geologic formation (Brooks 1981):
The geology is dominated clastic and shell deposits of the Fort Thompson Group Formation
Physiographic region (Brooks 1981):
The water body lies in the Black Creek Basin subdivision of the Duval Upland division of the Sea Island District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 2 months sampled:
|
pH |
7.7 |
Sulfate (mg/L) |
44.2 |
|
Total alkalinity (mg/L as CaCO3) |
45.0 |
Calcium (mg/L) |
27.0 |
|
Conductance (µS/cm @ 25 °C) |
947 |
Magnesium (mg/L) |
17.5 |
|
Color (Pt-Co units) |
109 |
Sodium (mg/L) |
121.5 |
|
Chloride (mg/L) |
243.3 |
Potassium (mg/L) |
5.7 |
|
Silicon (mg/L) |
3.4 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 25 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
43 |
74 |
149 |
|
Long-term total nitrogen concentrations (µg/L) |
730 |
1180 |
2250 |
|
Long-term total chlorophyll concentrations (µg/L) |
9.3 |
44.5 |
132.3 |
|
Long-term Secchi depth (ft) |
1.0 |
2.0 |
3.0 |
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 |
|
Feb-01-99 |
74 |
1020 |
38.0 |
2.1 |
|
Mar-14-99 |
69 |
1090 |
30.0 |
1.8 |
|
Apr-04-99 |
46 |
1020 |
13.3 |
2.3 |
|
May-02-99 |
65 |
1030 |
38.7 |
1.7 |
|
Jun-10-99 |
111 |
2250 |
43.7 |
1.7 |
|
Jul-13-99 |
81 |
1690 |
53.0 |
2.1 |
|
Sep-28-99 |
125 |
2180 |
40.0 |
2.6 |
|
Nov-25-99 |
97 |
1050 |
9.3 |
3.0 |
|
|
|
|
|
|
|
1999 Average |
83 |
1420 |
33.2 |
2.1 |