Howard (Polk County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°1'22", Longitude 81°44'34"
Period of record: 57 sampling dates; August 24, 1991 to April 6, 1997
Surface area (Shafer et al. 1986): 628 acres / 254 hectacres
Lake Region (Griffith et al. 1997): Winter Haven/Lake Henry Ridges
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Supplemental, unpublished water chemistry data, University of Florida.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 4 months sampled:
|
pH |
9.0 |
Sulfate (mg/L) |
19.7 |
|
Total alkalinity (mg/L as CaCO3) |
45.2 |
Calcium (mg/L) |
16.7 |
|
Conductance (µS/cm @ 25 °C) |
179 |
Magnesium (mg/L) |
16.7 |
|
Color (Pt-Co units) |
25 |
Sodium (mg/L) |
12.2 |
|
Chloride (mg/L) |
18.4 |
Potassium (mg/L) |
4.4 |
|
Silicon (mg/L) |
0.5 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 57 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
23 |
34 |
47 |
|
Long-term total nitrogen concentrations (µg/L) |
1110 |
1410 |
1930 |
|
Long-term total chlorophyll concentrations (µg/L) |
27.0 |
44.8 |
79.7 |
|
Long-term Secchi depth (ft) |
2.0 |
2.2 |
2.5 |
Florida LAKEWATCH data were not collected in 1999.
Howard (Polk County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on August 12, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
12 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
0 |
|
Average emergent plant biomass (kg wet wt/m2) |
3.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
3.5 |
|
Average submersed plant biomass (kg wet wt/m2) |
6.6 |
|
Average width of emergent and floating-leaved zone (ft.) |
99 |
|
Average lake depth (m) |
3 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
tapegrass |
Vallisneria americana |
100 |
|
water primrose |
Ludwigia octovalvis |
100 |
|
cat-tail |
Typha spp. |
90 |
|
willow |
Salix spp. |
90 |
|
knot grass |
Paspalum distichum |
90 |
|
duck-potato |
Sagittaria lancifolia |
70 |
|
water-pennywort |
Hydrocotyle umbellata |
70 |
|
elephant-ear |
Colocasia esculenta |
70 |
|
torpedograss |
Panicum repens |
60 |
|
pickerelweed |
Pontederia cordata |
50 |
|
wax myrtle |
Myrica cerifera |
50 |
|
bald cypress |
Taxodium distichum |
50 |
|
smartweed |
Polygonum hydropiperoides |
30 |
|
floating water-hyacinth |
Eichhornia crassipes |
20 |
|
salt-bush |
Baccharis spp. |
20 |
|
elderberry |
Sambucus canadensis |
20 |
|
. |
Cyperus virens |
20 |
|
melaleuca |
Melaleuca quinquenervia |
10 |
|
giant bulrush |
Scirpus californicus |
10 |
|
maidencane |
Panicum hemitomon |
10 |
|
para grass |
Brachiaria mutica |
10 |
|
rush fuirena |
Fuirena scirpoidea |
10 |
|
red-root flat sedge |
Cyperus erythrorhizos |
10 |