Monitoring wells: Installation

From LID SWM Planning and Design Guide
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Monitoring well stack installed next to underdrain within the LID practice.

Monitoring Wells[edit]

Monitoring wells allow for measurement of water levels in the sub-surface components of LID practices. They are important for sampling procedures and ensuring that the LID feature are performing as intended.

Construction Steps:

  1. Install a cap stand at the required elevation to anchor the monitoring well.
  2. Wrap the perforated pipe with a geotextile sock (to prevent migration of soil into the well).
  3. Anchor the perforated pipe to the bottom of the LID feature.
  4. Install a lockable cap to the top of the standpipe to protect against vandalism.
  5. Install monitoring equipment (e.g., a level logger) if required.

Key Inspection Points:

  • Pipe is perforated, rigid, and matches design specifications.
  • Well is installed according to contract documents.
  • Geotextile sock is wrapped around the perforated portion of the well.

Mistakes to Avoid:

  • Incorrect sequencing – ensure that standpipe is installed prior to backfilling with granular material.