Van Ness (Citrus County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°53'22", Longitude 82°19'15"
Period of record: 55 sampling dates; August 23, 1991 to December 27, 1999
Surface area : No data available.
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Supplemental, unpublished water chemistry data, University of Florida.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 |
7.5 |
Sulfate (mg/L) |
0.5 |
|
Total alkalinity (mg/L as CaCO3) |
45.7 |
Conductance (µS/cm @ 25 °C) |
134 |
|
Color (Pt-Co units) |
24 |
Chloride (mg/L) |
16.0 |
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 55 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
4 |
9 |
16 |
|
Long-term total nitrogen concentrations (µg/L) |
510 |
690 |
1360 |
|
Long-term total chlorophyll concentrations (µg/L) |
0.7 |
3.2 |
8.0 |
|
Long-term Secchi depth (ft) |
3.0 |
6.1 |
8.0 |
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 |
8 |
580 |
3.0 |
5.0 |
|
Mar-02-99 |
7 |
600 |
2.0 |
6.7 |
|
Mar-16-99 |
13 |
690 |
2.0 |
8.0 |
|
May-03-99 |
11 |
690 |
3.7 |
7.0 |
|
Jun-01-99 |
11 |
730 |
3.7 |
7.0 |
|
Jun-30-99 |
11 |
680 |
5.3 |
7.0 |
|
Aug-01-99 |
12 |
720 |
3.7 |
7.0 |
|
Aug-30-99 |
11 |
650 |
3.7 |
7.0 |
|
Oct-03-99 |
8 |
660 |
6.7 |
. |
|
Oct-31-99 |
9 |
710 |
5.7 |
7.5 |
|
Nov-28-99 |
11 |
620 |
3.7 |
. |
|
Dec-27-99 |
16 |
650 |
3.0 |
. |
|
|
|
|
|
|
|
1999 Average |
11 |
670 |
3.8 |
6.9 |
Van Ness (Citrus County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on August 11, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
82 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
11 |
|
Average emergent plant biomass (kg wet wt/m2) |
2.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
2.1 |
|
Average submersed plant biomass (kg wet wt/m2) |
4.3 |
|
Average width of emergent and floating-leaved zone (ft.) |
261 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
fragrant water-lily |
Nymphaea odorata |
100 |
|
bladderwort |
Utricularia foliosa |
100 |
|
duck-potato |
Sagittaria lancifolia |
90 |
|
water primrose |
Ludwigia octovalvis |
80 |
|
sawgrass |
Cladium jamaicense |
80 |
|
slender spikerush |
Eleocharis baldwinii |
70 |
|
spatterdock |
Nuphar luteum |
70 |
|
pickerelweed |
Pontederia cordata |
70 |
|
cone-spur bladderwort |
Utricularia gibba |
70 |
|
purple bladderwort |
Utricularia purpurea |
70 |
|
maidencane |
Panicum hemitomon |
70 |
|
bald cypress |
Taxodium distichum |
70 |
|
water-pennywort |
Hydrocotyle umbellata |
60 |
|
Illinois pondweed |
Potamogeton illinoensis |
60 |
|
variable-leaf milfoil |
Myriophyllum heterophyllum |
50 |
|
cat-tail |
Typha spp. |
40 |
|
purple fanwort |
Cabomba pulcherrima |
40 |
|
buttonbush |
Cephalanthus occidentalis |
40 |
|
red root |
Lachnanthes caroliniana |
40 |
|
red ludwigia |
Ludwigia repens |
30 |
|
willow |
Salix spp. |
20 |
|
yellow-eyed grass |
Xyris spp. |
20 |
|
banana-lily |
Nymphoides aquatica |
10 |
|
smartweed |
Polygonum hydropiperoides |
10 |
|
lemon bacopa |
Bacopa caroliniana |
10 |
|
tapegrass |
Vallisneria americana |
10 |
|
southern naiad |
Najas guadalupensis |
10 |
|
barnyard grass |
Echinochloa crusgalli |
10 |
|
rush fuirena |
Fuirena scirpoidea |
10 |
|
knot grass |
Paspalum distichum |
10 |
|
. |
Nitella prolonga |
10 |