Willis (Orange County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 28°23'54", Longitude 81°28'42"

Period of record: 83 sampling dates; July 22, 1989 to December 16, 1999

Surface area (LAKEWATCH): 129 acres / 58 hectacres     Bathymetric Map

Lake Region (Griffith et al. 1997): Doctor Phillips 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 Dr. Phillips Ridge division of the Central Lake District.
 
 

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 83 months sampled:


 
 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
5
10
30
Long-term total nitrogen concentrations (µg/L)
370
480
850
Long-term total chlorophyll concentrations (µg/L)
1.0
2.9
7.7
Long-term Secchi depth (ft)
7.0
10.8
13.3

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-10-99
8
470
2.0
11.0
Apr-01-99
11
380
1.0
12.0
May-10-99
9
410
2.0
13.0
Jul-09-99
15
440
2.0
10.0
Sep-02-99
10
480
4.0
11.0
Oct-11-99
10
460
4.0
10.0
Nov-15-99
8
520
4.0
10.0
Dec-16-99
12
550
4.0
10.0
         
1999 Average
10
460
2.9
10.9

 

Willis (Orange County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on September 17, 1991

Percent area covered with aquatic vegetation (PAC, %)
52
Percent of lake's volume filled with vegetation (PVI, %)
9
Average emergent plant biomass (kg wet wt/m2)
3.7
Average floating-leaved plant biomass (kg wet wt/m2)
1.1
Average submersed plant biomass (kg wet wt/m2)
6.5
Average width of emergent and floating-leaved zone (ft.)
34
Average lake depth (m)
4

 

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

Common Name Plant Species
Frequency (%)
pickerelweed Pontederia cordata
100
stonewort Nitella spp.
100
fragrant water-lily Nymphaea odorata
80
water primrose Ludwigia octovalvis
80
maidencane Panicum hemitomon
80
spatterdock Nuphar luteum
50
cone-spur bladderwort Utricularia gibba
50
torpedograss Panicum repens
40
banana-lily Nymphoides aquatica
30
cat-tail Typha spp.
30
hydrilla Hydrilla verticillata
30
sawgrass Cladium jamaicense
30
water-pennywort Hydrocotyle umbellata
20
rush fuirena Fuirena scirpoidea
20
buttonbush Cephalanthus occidentalis
10

 

Willis (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, %)
5
Average emergent plant biomass (kg wet wt/m2)
5.0
Average floating-leaved plant biomass (kg wet wt/m2)
2.4
Average submersed plant biomass (kg wet wt/m2)
3.7
Average width of emergent and floating-leaved zone (ft.)
35
Average lake depth (m)
4

 

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
water primrose Ludwigia octovalvis
90
torpedograss Panicum repens
90
stonewort Nitella spp.
90
maidencane Panicum hemitomon
80
spatterdock Nuphar luteum
70
banana-lily Nymphoides aquatica
60
hydrilla Hydrilla verticillata
50
wax myrtle Myrica cerifera
50
duck-potato Sagittaria lancifolia
30
cat-tail Typha spp.
30
water-pennywort Hydrocotyle umbellata
30
bald cypress Taxodium distichum
30
red ludwigia Ludwigia repens
20
willow Salix spp.
20
sawgrass Cladium jamaicense
20
sweetbay Magnolia virginiana
20
slender spikerush Eleocharis baldwinii
10
rush fuirena Fuirena scirpoidea
10

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