Henry (Polk County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°5'38", Longitude 81°40'11"
Period of record: 63 sampling dates; December 9, 1990 to December 13, 1999
Surface area (Shafer et al. 1986): 857 acres / 347 hectacres
Lake Region (Griffith et al. 1997): Southwestern Flatlands
Geologic formation (Brooks 1981):
The geology is dominated by deeply weathered clayey sand and granular sand of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the Winter Haven Karst division of the Central Lake District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 3 months sampled:
|
pH |
6.2 |
Sulfate (mg/L) |
24.9 |
|
Total alkalinity (mg/L as CaCO3) |
3.1 |
Calcium (mg/L) |
5.5 |
|
Conductance (µS/cm @ 25 °C) |
183 |
Magnesium (mg/L) |
5.5 |
|
Color (Pt-Co units) |
210 |
Sodium (mg/L) |
18.0 |
|
Chloride (mg/L) |
33.1 |
Potassium (mg/L) |
7.5 |
|
Silicon (mg/L) |
2.5 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 63 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
60 |
119 |
166 |
|
Long-term total nitrogen concentrations (µg/L) |
790 |
1060 |
1370 |
|
Long-term total chlorophyll concentrations (µg/L) |
2.0 |
5.4 |
16.3 |
|
Long-term Secchi depth (ft) |
0.8 |
1.7 |
5.1 |
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-30-99 |
104 |
810 |
3.0 |
1.9 |
|
Mar-07-99 |
101 |
870 |
3.3 |
2.0 |
|
Apr-09-99 |
104 |
800 |
2.7 |
2.6 |
|
May-04-99 |
113 |
880 |
7.0 |
2.4 |
|
Jun-09-99 |
85 |
820 |
8.0 |
2.0 |
|
Nov-08-99 |
74 |
900 |
8.3 |
1.9 |
|
Dec-13-99 |
72 |
1000 |
6.0 |
5.1 |
|
|
|
|
|
|
|
1999 Average |
93 |
870 |
5.5 |
2.6 |
Henry (Polk County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on May 19, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
8 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
2 |
|
Average emergent plant biomass (kg wet wt/m2) |
13.5 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
1.0 |
|
Average submersed plant biomass (kg wet wt/m2) |
0.0 |
|
Average width of emergent and floating-leaved zone (ft.) |
78 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
alligator-weed |
Alternanthera philoxeroides |
80 |
|
water primrose |
Ludwigia octovalvis |
70 |
|
cat-tail |
Typha spp. |
50 |
|
willow |
Salix spp. |
50 |
|
para grass |
Brachiaria mutica |
50 |
|
floating water-hyacinth |
Eichhornia crassipes |
40 |
|
water-pennywort |
Hydrocotyle umbellata |
30 |
|
common salvinia |
Salvinia rotundifolia |
20 |
|
smartweed |
Polygonum hydropiperoides |
20 |
|
pickerelweed |
Pontederia cordata |
20 |
|
maidencane |
Panicum hemitomon |
20 |
|
torpedograss |
Panicum repens |
20 |
|
duck-potato |
Sagittaria lancifolia |
10 |
|
buttonbush |
Cephalanthus occidentalis |
10 |