Harney (Volusia County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°45'16", Longitude 81°3'6"
Period of record: 66 sampling dates; May 20, 1990 to October 18, 1999
Surface area : No data available.
Lake Region (Griffith et al. 1997): Eastern Flatlands
Geologic formation (Brooks 1981):
The geology is dominated by dune sand and shell with silty sand, silt, and clay of the Princess Ann Formation.
Physiographic region (Brooks 1981):
The water body lies in the St. John’s Wet Prairie division of the Eastern Flatwoods District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 5 months sampled:
|
pH |
7.8 |
Sulfate (mg/L) |
79.1 |
|
Total alkalinity (mg/L as CaCO3) |
48.3 |
Calcium (mg/L) |
44.3 |
|
Conductance (µS/cm @ 25 °C) |
913 |
Magnesium (mg/L) |
70.6 |
|
Color (Pt-Co units) |
105 |
Sodium (mg/L) |
150.8 |
|
Chloride (mg/L) |
254.8 |
Potassium (mg/L) |
7.6 |
|
Silicon (mg/L) |
4.1 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 66 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
20 |
49 |
122 |
|
Long-term total nitrogen concentrations (µg/L) |
920 |
1230 |
1680 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
13.8 |
64.7 |
|
Long-term Secchi depth (ft) |
1.5 |
2.9 |
4.4 |
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 |
|
Apr-10-99 |
66 |
1010 |
9.0 |
3.2 |
|
May-23-99 |
122 |
1580 |
30.0 |
. |
|
Aug-15-99 |
71 |
1340 |
24.3 |
2.5 |
|
Oct-18-99 |
82 |
1520 |
6.0 |
1.5 |
|
|
|
|
|
|
|
1999 Average |
85 |
1360 |
17.3 |
2.4 |
Harney (Volusia County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 27, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
10 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
2 |
|
Average emergent plant biomass (kg wet wt/m2) |
1.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
1.1 |
|
Average submersed plant biomass (kg wet wt/m2) |
5.7 |
|
Average width of emergent and floating-leaved zone (ft.) |
322 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 20 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
tapegrass |
Vallisneria americana |
100 |
|
three-square |
Scirpus americanus |
100 |
|
hydrilla |
Hydrilla verticillata |
95 |
|
water-lettuce |
Pistia stratiotes |
90 |
|
common salvinia |
Salvinia rotundifolia |
80 |
|
azolla |
Azolla caroliniana |
70 |
|
torpedograss |
Panicum repens |
60 |
|
southern naiad |
Najas guadalupensis |
55 |
|
green algae |
Chlorphyta |
45 |
|
floating water-hyacinth |
Eichhornia crassipes |
40 |
|
alligator-weed |
Alternanthera philoxeroides |
40 |
|
widgeon grass |
Ruppia maritima |
35 |
|
musk-grass |
Chara spp. |
25 |
|
knot grass |
Paspalum distichum |
25 |
|
cat-tail |
Typha spp. |
20 |
|
willow |
Salix spp. |
20 |
|
. |
Eleocharis equisetoides |
20 |
|
spatterdock |
Nuphar luteum |
15 |
|
red ludwigia |
Ludwigia repens |
15 |
|
. |
Sagittaria stagonorum |
15 |
|
parrot's-feather |
Myriophyllum aquaticum |
10 |
|
water-pennywort |
Hydrocotyle umbellata |
10 |
|
coontail |
Ceratophyllum demersum |
10 |
|
buttonbush |
Cephalanthus occidentalis |
10 |
|
yellow-eyed grass |
Xyris spp. |
10 |
|
giant duckweed |
Spirodela polyrhiza |
5 |
|
slender spikerush |
Eleocharis baldwinii |
5 |
|
smartweed |
Polygonum hydropiperoides |
5 |
|
wax myrtle |
Myrica cerifera |
5 |
|
giant bulrush |
Scirpus californicus |
5 |
|
soft stem bulrush |
Scirpus validus |
5 |
|
southern water-grass |
Hydrochloa caroliniensis |
5 |
|
southern cutgrass |
Leersia hexandra |
5 |
|
bladderwort |
Utricularia foliosa |
5 |
|
bald cypress |
Taxodium distichum |
5 |
|
spider orchid |
Habenaria spp. |
5 |
|
. |
Rhexia mariana |
5 |