Shannon (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°33'53", Longitude 81°20'29"

Period of record: 102 sampling dates; December 11, 1990 to December 19, 1999

Surface area (LAKEWATCH): 15 acres / 6 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Orlando Ridge

Geologic formation (Brooks 1981):

The geology is dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the Orlando Promontory 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Supplemental, unpublished water chemistry data, University of Florida.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)
13.3
Total alkalinity (mg/L as CaCO3)
28.7
 Calcium (mg/L)
15.0
Conductance (µS/cm @ 25 °C)
170
 Magnesium (mg/L)
1.5
Color (Pt-Co units)
10
 Sodium (mg/L)
10.5
Chloride (mg/L)
23.3
 Potassium (mg/L)
3.5
Silicon (mg/L)
0.3
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 102 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
8
15
28
Long-term total nitrogen concentrations (µg/L)
340
510
1040
Long-term total chlorophyll concentrations (µg/L)
1.0
4.4
17.0
Long-term Secchi depth (ft)
5.8
11.0
15.0

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
Jan-18-99
14
440
2.0
14.0
Feb-20-99
13
450
4.3
12.0
Mar-17-99
15
460
2.0
12.0
Apr-19-99
16
410
4.0
10.0
May-18-99
18
520
5.0
12.0
Jun-20-99
14
450
2.0
12.0
Jul-17-99
15
430
3.3
15.0
Aug-19-99
17
510
9.0
10.0
Oct-18-99
16
480
9.0
7.0
Nov-18-99
15
610
7.0
9.0
Dec-19-99
18
540
5.3
11.0
         
1999 Average
15
480
4.8
11.3

 

Shannon (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 25, 1998

Percent area covered with aquatic vegetation (PAC, %)
30
Percent of lake's volume filled with vegetation (PVI, %)
3
Average emergent plant biomass (kg wet wt/m2)
15.4
Average floating-leaved plant biomass (kg wet wt/m2)
0.0
Average submersed plant biomass (kg wet wt/m2)
6.2
Average width of emergent and floating-leaved zone (ft.)
21
Average lake depth (m)
3

Frequency that plant species occur in 5 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
torpedograss Panicum repens
100
stonewort Nitella spp.
100
cat-tail Typha spp.
40
water primrose Ludwigia octovalvis
20
willow Salix spp.
20
maidencane Panicum hemitomon
20
musk-grass Chara spp.
20
bald cypress Taxodium distichum
20

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