De Witt (St Lucie County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 27°33'18", Longitude 80°24'31"
Period of record: 37 sampling dates; March 14, 1991 to December 6, 1999
Surface area : No data available.
Lake Region (Griffith et al. 1997): Eastern Flatlands
Geologic formation (Brooks 1981):
The geology is a mixture of two major types dominated by high energy, bar shelly, and dune sand with loose to hard limestone of the Anastasia Formation and beach and dune sand and shell with silty sand, silt, and clay of the Princess Ann Formation.
Physiographic region (Brooks 1981):
The water body lies in the Sebastion-St. Lucie Flats division of the Eastern Flatwoods District.
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 37 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
8 |
32 |
68 |
|
Long-term total nitrogen concentrations (µg/L) |
410 |
970 |
2280 |
|
Long-term total chlorophyll concentrations (µg/L) |
3.0 |
22.3 |
109.3 |
|
Long-term Secchi depth (ft) |
0.7 |
3.8 |
6.8 |
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-08-99 |
49 |
1310 |
84.5 |
1.0 |
|
Mar-01-99 |
48 |
1660 |
37.7 |
1.0 |
|
Apr-05-99 |
48 |
1470 |
59.7 |
0.8 |
|
May-03-99 |
47 |
2280 |
109.3 |
0.7 |
|
Jun-07-99 |
27 |
2110 |
23.7 |
3.4 |
|
Jul-06-99 |
32 |
1680 |
72.0 |
3.3 |
|
Aug-02-99 |
37 |
1170 |
9.3 |
4.5 |
|
Sep-07-99 |
23 |
1090 |
15.7 |
3.7 |
|
Oct-04-99 |
27 |
1100 |
18.0 |
3.3 |
|
Nov-01-99 |
37 |
1060 |
12.7 |
3.1 |
|
Dec-06-99 |
30 |
1670 |
5.0 |
4.2 |
|
|
|
|
|
|
|
1999 Average |
37 |
1510 |
40.7 |
2.6 |
De Witt (St Lucie County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on August 19, 1992
|
Percent area covered with aquatic vegetation (PAC, %) |
78 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
18 |
|
Average emergent plant biomass (kg wet wt/m2) |
0.7 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
1.0 |
|
Average submersed plant biomass (kg wet wt/m2) |
2.9 |
|
Average width of emergent and floating-leaved zone (ft.) |
8 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
water-pennywort |
Hydrocotyle umbellata |
70 |
|
southern naiad |
Najas guadalupensis |
70 |
|
torpedograss |
Panicum repens |
70 |
|
bacopa |
Bacopa monnieri |
60 |
|
musk-grass |
Chara spp. |
30 |
|
rush fuirena |
Fuirena scirpoidea |
30 |
|
pickerelweed |
Pontederia cordata |
20 |
|
cat-tail |
Typha spp. |
20 |
|
tapegrass |
Vallisneria americana |
10 |