Quick Answer
Prevent groundwater contamination from cisterns by installing a proper liner, ensuring a watertight seal, and using a geotextile filter to prevent soil and debris from entering the cistern. Regular maintenance and inspections are also crucial to prevent contamination.
Liner Selection and Installation
Selecting the right liner for the cistern is crucial to prevent groundwater contamination. A high-density polyethylene (HDPE) liner with a minimum thickness of 20 mils is recommended. Ensure the liner is buried at least 12 inches below the cistern floor to prevent soil and debris from entering. Install the liner with a 2-inch overlap at the seams and seal with a geosynthetic liner sealant.
Geotextile Filter and Drainage
A geotextile filter should be installed around the cistern to prevent soil and debris from entering. A non-woven geotextile with a minimum thickness of 12 mils is recommended. Ensure the filter is wrapped around the cistern at least 6 inches below the liner and extends at least 12 inches above the liner. Install a drainage pipe to prevent water accumulation around the cistern.
Regular Maintenance and Inspections
Regular maintenance and inspections are crucial to prevent groundwater contamination from cisterns. Inspect the liner and geotextile filter regularly for signs of damage or wear. Check the cistern for any signs of leaks or water accumulation. Ensure the cistern is regularly cleaned and maintained to prevent the growth of algae or bacteria.
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