The most suitable test for measuring the permeability of clayey soils in the laboratory is ______.

Constant head test
Pumping out test
Hydrometer test
Falling head test

Correct answer: Falling head test

Solution

The falling head test is ideal for measuring the permeability of clayey soils because it is designed for soils with low permeability, allowing for accurate measurement of water flow through the soil over time.

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