CAN/BNQ 2501-135-M88

1.1 Describes the method used to determine the coefficient of permeability of a soil around a cavity opened under the end of a casing. 1.2 The test consists in causing gravity flow in the soil from a cavity of a given shape, known as the lantern, filled with a permeable material. The test must be carried out when the cavity is located below the local piezometric level. 1.3 Three testing methods are described in this standard: a) method 1, constant head; b) method 2, variable falling head; c) method 3, variable rising head.