Seminary (Seminole County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°38'31", Longitude 81°21'37"

Period of record: 96 sampling dates; February 19, 1990 to September 24, 1999

Surface area (LAKEWATCH): 68 acres / 27 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Apopka Upland

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Supplemental, unpublished water chemistry data, University of Florida.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
6.3
 Sulfate (mg/L)
24.2
Total alkalinity (mg/L as CaCO3)
2.3
 Calcium (mg/L)
9.2
Conductance (µS/cm @ 25 °C)
186
 Magnesium (mg/L)
2.5
Color (Pt-Co units)
4
 Sodium (mg/L)
18.5
Chloride (mg/L)
33.2
 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 96 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
5
8
19
Long-term total nitrogen concentrations (µg/L)
260
380
660
Long-term total chlorophyll concentrations (µg/L)
1.0
3.1
10.0
Long-term Secchi depth (ft)
9.7
14.6
21.0

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-24-99
6
280
2.7
18.2
Feb-20-99
7
360
2.0
18.0
Apr-11-99
8
380
2.0
17.8
May-16-99
7
380
2.0
16.0
Jul-18-99
7
380
2.0
16.0
Aug-28-99
7
460
3.0
14.2
Sep-24-99
9
540
4.0
12.2
         
1999 Average
7
400
2.5
16.0

Seminary (Seminole County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on July 8, 1992

Percent area covered with aquatic vegetation (PAC, %)
34
Percent of lake's volume filled with vegetation (PVI, %)
2
Average emergent plant biomass (kg wet wt/m2)
4.1
Average floating-leaved plant biomass (kg wet wt/m2)
1.5
Average submersed plant biomass (kg wet wt/m2)
3.1
Average width of emergent and floating-leaved zone (ft.)
50
Average lake depth (m)
6

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
fragrant water-lily Nymphaea odorata
90
bog-moss Mayaca fluviatilis
90
rush fuirena Fuirena scirpoidea
90
slender spikerush Eleocharis baldwinii
80
maidencane Panicum hemitomon
80
stonewort Nitella spp.
80
banana-lily Nymphoides aquatica
70
baby-tears Micranthemum umbrosum
70
pickerelweed Pontederia cordata
60
water-pennywort Hydrocotyle umbellata
60
buttonbush Cephalanthus occidentalis
60
torpedograss Panicum repens
50
bladderwort Utricularia foliosa
50
smartweed Polygonum hydropiperoides
30
water primrose Ludwigia octovalvis
30
flat-sedge Cyperus odoratus
20
water spikerush Eleocharis elongata
20
jointed flat sedge Cyperus haspan
20
duck-potato Sagittaria lancifolia
10
red ludwigia Ludwigia repens
10
bacopa Bacopa monnieri
10
purple bladderwort Utricularia purpurea
10
Illinois pondweed Potamogeton illinoensis
10
melaleuca Melaleuca quinquenervia
10
St. John's wort Hypericum spp.
10
red root Lachnanthes caroliniana
10

Seminary (Seminole County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on September 14, 1998

Percent area covered with aquatic vegetation (PAC, %)
40
Percent of lake's volume filled with vegetation (PVI, %)
4
Average emergent plant biomass (kg wet wt/m2)
5.7
Average floating-leaved plant biomass (kg wet wt/m2)
1.7
Average submersed plant biomass (kg wet wt/m2)
3.9
Average width of emergent and floating-leaved zone (ft.)
38
Average lake depth (m)
5

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
fragrant water-lily Nymphaea odorata
90
pickerelweed Pontederia cordata
90
stonewort Nitella spp.
90
slender spikerush Eleocharis baldwinii
80
baby-tears Micranthemum umbrosum
70
water primrose Ludwigia octovalvis
70
torpedograss Panicum repens
60
rush fuirena Fuirena scirpoidea
60
maidencane Panicum hemitomon
50
banana-lily Nymphoides aquatica
40
water-pennywort Hydrocotyle umbellata
40
cone-spur bladderwort Utricularia gibba
40
bald cypress Taxodium distichum
40
red maple Acer rubrum
40
duck-potato Sagittaria lancifolia
30
red ludwigia Ludwigia repens
30
lemon bacopa Bacopa caroliniana
30
dwarf arrowhead Sagittaria subulata
30
buttonbush Cephalanthus occidentalis
30
cat-tail Typha spp.
20
tapegrass Vallisneria americana
20
bog-moss Mayaca fluviatilis
20
wax myrtle Myrica cerifera
20
red root Lachnanthes caroliniana
20
common salvinia Salvinia rotundifolia
10
elephant-ear Colocasia esculenta
10
salt-bush Baccharis spp.
10
water tupelo Nyssa aquatica
10
melaleuca Melaleuca quinquenervia
10
willow Salix spp.
10
St. John's wort Hypericum spp.
10
bladderwort Utricularia foliosa
10
umbrella sedge Cyperus alternifolius
10
respuinata bladderwort Utricularia resupinata
10

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