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Percolation Test | Atlantic Stormwater Initiative

Percolation Test

A percolation test is helpful for figuring out how well water drains in your soil. Use the simple methods below to get a sense whether your soil drains well, is average, or drains poorly.

Procedure
  1. Dig Hole: Dig a testing hole approximately 1 ft in diameter and in depth in the area of interest. If you will be testing a large area, consider digging multiple holes to better understand your property.
  2. Fill Hole with Water: Saturate the hole by filling it with water and allowing it to sit overnight. Saturated soil will give a more accurate test reading.
  3. Refill Hole with Water: The following day, refill the hole with water.
  4. Measure Water Level: Lay a straight edge, such as a stick or pipe, across the top of the hole. Insert a tape measure or metre-stick and determine the depth of water.
  5. Measure Drainage Every Hour: Measure the water level hourly until the hole is empty. Note each measurement.
Ideal Soil Drainage

Ideal soil drainage is approximately 2″ per hour; however, soil within a range of 1-3″ per hour will accommodate plants with average drainage requirements.

At a rate less than 1″ per hour, you will either need to improve soil drainage or select plants that thrive in wet soil.

At a rate over 4″ per hour, drainage is too fast.

Improving Soil Drainage
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