Illinois Volunteer Lake Monitoring Program
There are 3,041 lakes in Illinois and more than 87,000
ponds. In addition to being valuable recreational and ecological resources, these lakes
serve as potable, industrial, and agricultural water supplies; as cooling water sources;
and as flood control structures.
Lakes serve as traps for materials generated within their
watersheds. The trapped material generally impairs water quality and may severely impact
beneficial uses and significantly shorten the life of the lake. Suspended and deposited
sediments can cause serious use impairment problems. Excessive aquatic macrophyte (plant)
growth and/or algal blooms often result from the addition of nutrients such as nitrogen
and phosphorus. An overabundance of plant life may tend to limit recreational and public
water supply usage. Lakes may also collect heavy metal and organic contamination from
urban, industrial, and agricultural sources. Dissolved oxygen deficiencies may limit
biological habitat, or result in taste and odor problems for public water supplies.
Lakes are important resources that will continue to provide
beneficial uses only if certain protective and educational steps are taken. In recognition
of this need, the Volunteer Lake
Monitoring Program (VLMP) was established in 1981 by the Illinois Environmental Protection
Agency (EPA). The VLMP serves as an educational program for citizens to learn about lake
ecosystems, as well as a cost-effective method of gathering fundamental information on
Illinois inland lakes. The VLMP utilizes funds provided by the federal Clean Water Act and
the state-funded Conservation 2000 Program to achieve the following objectives:
Increase citizen
knowledge and awareness of the factors that affect lake quality so they can understand the
lake/watershed/ecosystem and make informed decisions.
Encourage development and
implementation of sound lake protection and management plans.
Develop local grass roots
support for environmental programs and foster cooperation among citizens, organizations
and various units of government.
Provide historic data to
help document water quality impacts and support lake management decision-making.
Provide a guide for the
implementation of lake protection/restoration and a framework for technical assistance for
cooperative lake and watershed management projects.
Basic Monitoring
In the Basic Monitoring Program, citizens select a lake in
which they have an interest and are then trained to measure water clarity (transparency)
using a Secchi disk. The disk consists of an eight-inch diameter, weighted metal plate
painted black and white in alternate quadrants and attached to a calibrated rope. The disk
is lowered into the lake water, and the depth at which it is no longer visible is noted.
This measurement is called the Secchi disk transparency or the Secchi depth. The Secchi
depth is used to document changes in the transparency of lake water. Typically, three
sites are monitored on a lake, two times per month from May through October. The volunteer
also records a series of field observations relating to other important environmental
characteristics of the lake, such as water color, amount of aquatic plants present and
site depth. Weather conditions on the day of sampling, as well as during the prior 48
hours, are reported. Recent lake management activities or other factors which could impact
the lake are also documented. Along with the Secchi transparency monitoring, all
volunteers are provided with a Zebra Mussel sampler. This sampler is placed in the lake
near a high traffic area boat dock, a likely place for introduction of this exotic
species. Volunteers inspect this sampler as well as the shoreline areas of the lake once a
month for the presence of Zebra Mussels.
Expanded Monitoring
After completing the Basic Monitoring Program for at least one year,
volunteers enter a rotation which allows them to collect more detailed information on
their lake. Participants in the Expanded Monitoring Program collect water samples monthly.
One collection is made from one foot below the surface of the water. This sample is
analyzed for ammonia, nitrates, total phosphorus, total suspended solids and volatile
suspended solids. Another water sample is collected at twice the Secchi depth. This sample
is filtered by the volunteer and analyzed for chlorophyll. Both the water sample and the
chlorophyll filter are shipped to Illinois EPA's Champaign Laboratory for analysis. All
analysis is done free of charge to the volunteer.
For further information about the program,
contact the Division of Water Pollution Control-Lakes Unit at 217/782-3362 or the Illinois
EPA Office of Public Information at 217/782-3397. |
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![Illinois Volunteer Lake Monitoring Program](vlmp-logo.gif) |
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