Public test guide

Constant-head permeability

Measures water flow through a relatively permeable soil while a constant hydraulic head is maintained.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

A steady difference in water level is applied across a saturated specimen and the flow volume is measured.

Prepared specimen, constant-head permeameter, water supply, measuring cylinder, timer and thermometer.

The coefficient of permeability under steady-flow conditions.

Commonly used for sands and gravels in drainage, filter and seepage assessments.

Typical test sequence

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