Public test guide

Falling-head permeability

Measures how readily water flows through relatively low-permeability soil.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

Water is allowed to pass through a saturated specimen while the drop in water head in a standpipe is measured over time.

Prepared specimen, permeameter, standpipe, water supply, timing device and temperature measurement.

The coefficient of permeability under the test condition.

Used for drainage, seepage, liner, embankment and groundwater-related design assessments.

Typical test sequence

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