Knowledge of the permeability characteristics of soil is essential for construction projects where drainage is an important element. In particular, permeability is a key parameter for the design and assessment of landfill sites, the investigation of contaminated ground, the design of earth dams and sheet pile walls, and in assessing the potential for lowering groundwater levels.

This combination permeameter has a transparent plastic chamber for soil specimens of either fine-grained or coarse-grained soils. Generally, soils containing 10 percent or more particles passing a 75 μm sieve are tested using the falling head assembly. More granular soils, containing 90 percent or more particles retained on the 75 μm sieve, are tested using the constant head assembly. Includes accessories for conducting both constant and falling head permeability studies.

Model No. Desc
SP25-0623 Combination Permeameter, 2.5" (63.4 mm)

These Permeameters are designed for performing either constant head or falling head permeability tests on undisturbed, remoulded or compacted soils.

Model No. Desc
25-0607 Compaction permeameter
25-0611 De-airing tank
25-0613 Soaking tank
25-0609 Standpipe panel

This equipment is used for testing the permeability of granular soils (sands and gravels).The specimen is formed in a permeability cell and water is passed through it from a constant level tank. Take-off points located along the sides of the permeability cell are connected to three manometer tubes mounted on a panel complete with a metre scale. Water passing through the specimen is collected and measured, either for a specific quantity or over a period of time. The reduction of head is noted from the variation of water level in the manometer tubes.

Model No. Desc
25-0580 Constant head permeability cell
25-0593 Constant level tank
25-0591 Manometer tubes & stand

Clays and silts are tested using the falling head technique. Flow of water through the specimen is observed by monitoring the rate of fall of water in the tube. It is essential that soils of very low permeability are sealed inside the cylinder to prevent seepage along the sides of the specimen. Before testing, the specimen must be completely saturated with water as the presence of air will restrict the flow of water.

Model No. Desc
25-0605 Falling Head Permeability Cell

The Guelph Permeameter is used to obtain accurate measurements of hydraulic conductivity, soil sorptivity and soil matrix flux potential. These three factors govern how liquids will move through an unsaturated soil profile.

Model No. Desc
25-0650 Guelph Permeameter