Croft (Citrus County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°52'59", Longitude 82°19'46"
Period of record: 37 sampling dates; November 10, 1992 to July 22, 1999
Surface area (Shafer et al. 1986): 4 acres / 2 hectacres
Lake Region (Griffith et al. 1997): Tsala Apopka
Geologic formation (Brooks 1981):
The geology is dominated by limestone consisting of skeletons of fossils in a silt to sand size matrix of the Ocala Limestone Formation.
Physiographic region (Brooks 1981):
The water body lies in the Tsala Apopka Basin division of the Ocala Uplift District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
7.6 |
Sulfate (mg/L) |
0.2 |
|
Total alkalinity (mg/L as CaCO3) |
36.0 |
Calcium (mg/L) |
14.3 |
|
Conductance (µS/cm @ 25 °C) |
115 |
Magnesium (mg/L) |
1.4 |
|
Color (Pt-Co units) |
19 |
Sodium (mg/L) |
7.2 |
|
Chloride (mg/L) |
14.0 |
Potassium (mg/L) |
0.1 |
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) |
3 |
8 |
13 |
|
Long-term total nitrogen concentrations (µg/L) |
480 |
630 |
870 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
2.9 |
4.7 |
|
Long-term Secchi depth (ft) |
5.3 |
8.1 |
12.0 |
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-15-99 |
8 |
580 |
4.0 |
7.0 |
|
Feb-26-99 |
10 |
620 |
3.3 |
6.7 |
|
Mar-17-99 |
11 |
600 |
4.7 |
7.0 |
|
Apr-19-99 |
12 |
670 |
3.0 |
7.3 |
|
May-20-99 |
13 |
740 |
3.7 |
8.3 |
|
Jun-13-99 |
12 |
700 |
4.3 |
6.3 |
|
Jul-22-99 |
10 |
620 |
4.0 |
7.7 |
|
|
|
|
|
|
|
1999 Average |
11 |
650 |
3.9 |
7.2 |
Croft (Citrus County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on August 11, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
80 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
10 |
|
Average emergent plant biomass (kg wet wt/m2) |
5.1 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
2.0 |
|
Average submersed plant biomass (kg wet wt/m2) |
8.0 |
|
Average width of emergent and floating-leaved zone (ft.) |
684 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
duck-potato |
Sagittaria lancifolia |
100 |
|
pickerelweed |
Pontederia cordata |
100 |
|
maidencane |
Panicum hemitomon |
100 |
|
fragrant water-lily |
Nymphaea odorata |
90 |
|
Illinois pondweed |
Potamogeton illinoensis |
90 |
|
sawgrass |
Cladium jamaicense |
90 |
|
bladderwort |
Utricularia foliosa |
90 |
|
spatterdock |
Nuphar luteum |
80 |
|
variable-leaf milfoil |
Myriophyllum heterophyllum |
80 |
|
water primrose |
Ludwigia octovalvis |
80 |
|
slender spikerush |
Eleocharis baldwinii |
70 |
|
tapegrass |
Vallisneria americana |
70 |
|
lemon bacopa |
Bacopa caroliniana |
60 |
|
red root |
Lachnanthes caroliniana |
60 |
|
water-pennywort |
Hydrocotyle umbellata |
50 |
|
purple bladderwort |
Utricularia purpurea |
50 |
|
buttonbush |
Cephalanthus occidentalis |
50 |
|
knot grass |
Paspalum distichum |
50 |
|
red ludwigia |
Ludwigia repens |
40 |
|
wax myrtle |
Myrica cerifera |
30 |
|
willow |
Salix spp. |
30 |
|
. |
Nitella prolonga |
30 |
|
cone-spur bladderwort |
Utricularia gibba |
20 |
|
salt-bush |
Baccharis spp. |
20 |
|
yellow-eyed grass |
Xyris spp. |
20 |
|
American lotus |
Nelumbo lutea |
10 |
|
smartweed |
Polygonum hydropiperoides |
10 |
|
cat-tail |
Typha spp. |
10 |
|
purple fanwort |
Cabomba pulcherrima |
10 |
|
elephant-ear |
Colocasia esculenta |
10 |
|
water spikerush |
Eleocharis elongata |
10 |
|
bald cypress |
Taxodium distichum |
10 |