Helen (Volusia County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°59'6", Longitude 81°13'48"
Period of record: 20 sampling dates; July 15, 1991 to December 29, 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Supplemental, unpublished water chemistry data, University of Florida.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 |
7.2 |
Sulfate (mg/L) |
26.7 |
|
Total alkalinity (mg/L as CaCO3) |
19.0 |
Calcium (mg/L) |
11.0 |
|
Conductance (µS/cm @ 25 °C) |
166 |
Magnesium (mg/L) |
3.0 |
|
Color (Pt-Co units) |
13 |
Sodium (mg/L) |
10.7 |
|
Chloride (mg/L) |
21.4 |
Potassium (mg/L) |
3.9 |
|
Silicon (mg/L) |
0.2 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 20 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
17 |
24 |
36 |
|
Long-term total nitrogen concentrations (µg/L) |
410 |
740 |
1470 |
|
Long-term total chlorophyll concentrations (µg/L) |
2.3 |
12.6 |
50.3 |
|
Long-term Secchi depth (ft) |
2.0 |
5.7 |
9.5 |
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 |
|
Apr-29-99 |
19 |
500 |
4.3 |
9.5 |
|
May-30-99 |
27 |
590 |
6.7 |
5.8 |
|
Jul-01-99 |
36 |
620 |
7.7 |
6.0 |
|
Jul-30-99 |
19 |
460 |
4.0 |
6.9 |
|
Aug-30-99 |
23 |
530 |
2.3 |
5.0 |
|
Sep-30-99 |
19 |
410 |
4.0 |
8.4 |
|
Oct-30-99 |
26 |
530 |
7.7 |
7.0 |
|
Dec-01-99 |
22 |
530 |
11.7 |
6.2 |
|
Dec-29-99 |
21 |
440 |
7.3 |
7.8 |
|
|
|
|
|
|
|
1999 Average |
24 |
510 |
6.2 |
7.0 |