Colby (Volusia County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°57'52", Longitude 81°13'55"
Period of record: 15 sampling dates; August 3, 1998 to November 28, 1999
Surface area : No data available.
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 Crescent City-Deland Ridge division of the Central Lake District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 2 months sampled:
|
pH |
6.7 |
Sulfate (mg/L) |
8.8 |
|
Total alkalinity (mg/L as CaCO3) |
10.2 |
Calcium (mg/L) |
7.1 |
|
Conductance (µS/cm @ 25 °C) |
82 |
Magnesium (mg/L) |
1.6 |
|
Color (Pt-Co units) |
93 |
Sodium (mg/L) |
7.1 |
|
Chloride (mg/L) |
16.1 |
Potassium (mg/L) |
1.5 |
|
Silicon (mg/L) |
0.2 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 15 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
19 |
26 |
43 |
|
Long-term total nitrogen concentrations (µg/L) |
530 |
800 |
1320 |
|
Long-term total chlorophyll concentrations (µg/L) |
6.0 |
16.4 |
42.7 |
|
Long-term Secchi depth (ft) |
2.4 |
4.8 |
6.5 |
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-05-99 |
19 |
540 |
8.7 |
6.1 |
|
Feb-10-99 |
21 |
570 |
7.3 |
6.0 |
|
Mar-07-99 |
23 |
610 |
6.7 |
4.3 |
|
May-04-99 |
27 |
710 |
9.0 |
4.7 |
|
May-31-99 |
34 |
920 |
13.3 |
3.5 |
|
Jul-04-99 |
22 |
830 |
10.7 |
5.1 |
|
Aug-29-99 |
25 |
800 |
19.0 |
3.8 |
|
Oct-03-99 |
43 |
1150 |
42.7 |
2.8 |
|
Oct-31-99 |
35 |
1320 |
28.3 |
2.4 |
|
Nov-28-99 |
28 |
1210 |
6.0 |
3.0 |
|
|
|
|
|
|
|
1999 Average |
28 |
870 |
15.2 |
4.2 |