Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 29°9'12", Longitude 81°49'56"
Period of record: 119 sampling dates; January 31, 1990 to December 27, 1999
Surface area (LAKEWATCH): 516 acres / 209 hectacres Bathymetric Map
Lake Region (Griffith et al. 1997): Central Valley
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 Lynne Karst division of the Central Lake
District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
| pH |
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Sulfate (mg/L) |
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| Total alkalinity (mg/L as CaCO3) |
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Calcium (mg/L) |
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| Conductance (µS/cm @ 25 °C) |
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Magnesium (mg/L) |
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| Color (Pt-Co units) |
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Sodium (mg/L) |
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| Chloride (mg/L) |
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Potassium (mg/L) |
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Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 119 months sampled:
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| Long-term total phosphorus concentrations (µg/L) |
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| Long-term total nitrogen concentrations (µg/L) |
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| Long-term total chlorophyll concentrations (µg/L) |
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| Long-term Secchi depth (ft) |
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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:
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Halfmoon (Marion County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 16, 1992
| Percent area covered with aquatic vegetation (PAC, %) |
16
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| Percent of lake's volume filled with vegetation (PVI, %) |
2
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| Average emergent plant biomass (kg wet wt/m2) |
2.4
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| Average floating-leaved plant biomass (kg wet wt/m2) |
3.4
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| Average submersed plant biomass (kg wet wt/m2) |
0.0
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| Average width of emergent and floating-leaved zone (ft.) |
40
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| Average lake depth (m) |
3
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Frequency that plant species occur in 10 evenly spaced transects around the lake.
| Common Name | Plant Species |
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| maidencane | Panicum hemitomon |
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| spatterdock | Nuphar luteum |
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| duck-potato | Sagittaria lancifolia |
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| sawgrass | Cladium jamaicense |
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| slender spikerush | Eleocharis baldwinii |
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| smartweed | Polygonum hydropiperoides |
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| buttonbush | Cephalanthus occidentalis |
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| willow | Salix spp. |
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| water hemlock | Cicuta mexicana |
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| water-pennywort | Hydrocotyle umbellata |
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| torpedograss | Panicum repens |
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Halfmoon (Marion County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on May 13, 1999
| Percent area covered with aquatic vegetation (PAC, %) |
6
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| Percent of lake's volume filled with vegetation (PVI, %) |
1
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| Average emergent plant biomass (kg wet wt/m2) |
8.2
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| Average floating-leaved plant biomass (kg wet wt/m2) |
6.4
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| Average submersed plant biomass (kg wet wt/m2) |
0.2
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| Average width of emergent and floating-leaved zone (ft.) |
303
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| Average lake depth (m) |
4
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Frequency that plant species occur in 10 evenly spaced transects around the lake.
| Common Name | Plant Species |
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| duck-potato | Sagittaria lancifolia |
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| spatterdock | Nuphar luteum |
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| pickerelweed | Pontederia cordata |
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| buttonbush | Cephalanthus occidentalis |
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| maidencane | Panicum hemitomon |
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| sawgrass | Cladium jamaicense |
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| willow | Salix spp. |
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| fragrant water-lily | Nymphaea odorata |
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| elderberry | Sambucus canadensis |
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| slender spikerush | Eleocharis baldwinii |
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| banana-lily | Nymphoides aquatica |
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| red maple | Acer rubrum |
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| water-pennywort | Hydrocotyle umbellata |
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| wax myrtle | Myrica cerifera |
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| cone-spur bladderwort | Utricularia gibba |
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| sweetbay | Magnolia virginiana |
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| big rose mallow | Hibiscus grandiflorus |
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