Abstract
The Hazen formula, Kozeny-Carman formula, Pavchich formula, and Shahabi et al. formulas were used to predict the coefficient of permeability of nonplastic soils and compared with laboratory tests performed for eight soils of different porosities. The best correlation was obtained when using the Shahabi et al. formula. Knowing the velocity of water flow in soils is very important for the verification of stability against hydraulic hive, internal erosion, and in the design of drains and walls. The flow of water in soils is almost always laminar, and the water velocity is proportional to the coefficient of permeability.
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