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Lake Howell

Howell, Lake

Map

located within Howell Creek Watershed

Description

Explore general as well as scientific information about the movement, chemistry and biology of area surface water environments.

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Water Quality Sampling Sites
Hydrology Sampling Sites
Other Sampling Sites
 

Lake Vegetation Index (LVI)

The LVI is a rapid bioassessment tool created by the Florida Department of Environmental Protection (FDEP) to assess the biological condition of aquatic plant communities in Florida lakes. It utilizes a multi-metric index that evaluates how closely a lake's plant community compares to a lake containing minimal human disturbance (known as a reference lake) and is based on a field assessment of aquatic and wetland plants. Plants respond to disturbances such as the introduction of invasive exotic species (hydrilla as an example), lakeshore alterations such as creating beaches, and introduction of excess nutrients received by the surrounding watershed (use of fertilizers).

Latest LVI
(
Historic Range
(7/25/2007 - 8/17/2016)
44 (Healthy) 23 (Impaired) - 47 (Healthy)


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Invasive Water Hyacinth (<em>Eichhornia crassipes</em>)
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Legend

Aquatic Life Use Category LVI Range Description
Exceptional 78 - 100

Nearly every macrophyte present is a species native to Florida, invasive taxa typically not found. About 30% of taxa present are identified as sensitive to disturbance and most taxa have C of C values > 5.

Healthy 43 - 77

About 85% of macrophyte taxa are native to Florida; invasive taxa present. Sensitive taxa have declined to about 15% and C of C values average about 5.

Impaired 0 - 42

About 70% of macrophyte taxa are native to Florida. Invasive taxa may represent up to 1/3 of total taxa. Less that 10% of the taxa are sensitive and C of C values of most taxa are < 4.

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Vegetation Biovolume Heat Maps

Biovolume (BV) heat maps give us a look at the aquatic plants under water. These maps represent the ratio of plant height to water depth. Areas with no vegetation will appear blue, and areas where the vegetation reaches the surface will appear red. The data is collected through a combination of GPS and acoustic sonar instrumentation.

Vegetation Biovolume Heat Map(s) for Howell, Lake

  • Vegetation Biovolume Heat Map (12/30/2015)
  • Vegetation Biovolume Heat Map (2/18/2014)

Report Years

Legend

Biovolume %
0100
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Vegetation Sampling

Vegetation sampling is the identification and quantification of plant species and communities. Vegetation sampling is a tool used in environmental assessments and can inform a myriad of assessment goals including biomass availability, water quality concerns, management benchmarks, and determining the introduction and establishment of invasive species. Sampling can be conducted via destructive or non-destructive methods. Learn more about vegetation sampling from the links and documents listed below.

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Plant Species Inventory

Plant Species Inventory

This information shows the approximate number and diversity of aquatic plants in and around your lake based on the rapid assessment of your waterbody's vegetation. Learn more about the plant species inventory »

     
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    Macroinvertebrate Data

    Macroinvertebrate Data

    Macroinvertebrates are animals that can serve as indicators of water quality. Aquatic macroinvertebrates include animals that live in wet environments such as lakes, marshes, ponds, rivers, streams, and wetlands—they can even be found in buckets of standing water or in puddles. Macroinvertebrates are valuable biological indicators of the health of a water resource. Learn more about macroinvertebrate data »

    Here is some information on the aquatic invertebrates living in your watershed.

     
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    Grass Carp Permits

    Grass Carp Permits

    Grass carp are fish that are used to control nuisance aquatic vegetation (Hydrilla, etc.). Click on the permit information link to visit the Florida Fish and Wildlife Conservation Commission for more information about the Triploid Grass Carp stocking program. Learn more about grass carp permits »

     
    Stocking Date Number of Individuals Stocked Target (at initial stocking) Primary Use (at initial stocking)
    4/2/1999 2334 HYDRILLA FISH/BOAT
    5/2/2001 1200 HYDRILLA FISH/BOAT
    6/4/2002 2700 HYDRILLA FISH/BOAT
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