Theresa (Volusia County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°53'55", Longitude 81°11'40"

Period of record: 9 sampling dates; March 23, 1999 to November 21, 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Supplemental, unpublished water chemistry data, University of Florida.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 1 month sampled:
 
pH
5.1
Total alkalinity (mg/L as CaCO3)
0.0
Conductance (µS/cm @ 25 °C)
109
Color (Pt-Co units)
12
Chloride (mg/L)
25.5
   

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 9 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
7
10
14
Long-term total nitrogen concentrations (µg/L)
420
490
580
Long-term total chlorophyll concentrations (µg/L)
2.7
4.3
6.0
Long-term Secchi depth (ft)
4.1
5.1
7.1

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
Mar-23-99
11
520
4.3
5.4
Apr-19-99
14
450
6.0
4.1
May-19-99
14
450
4.0
4.9
Jun-30-99
12
420
4.0
4.4
Jul-25-99
8
430
2.7
5.8
Aug-22-99
9
500
5.0
4.9
Oct-01-99
7
520
6.0
7.1
Oct-24-99
9
550
3.7
4.3
Nov-21-99
9
580
3.0
4.8
         
1999 Average
10
490
4.3
5.1

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