Constant Head Permeability Apparatus

Constant Head apparatus


This method describes a procedure for the determination of the permeability of water through granular (cohesionless) soils in a steady-state condition. The procedure is to establish representative values of the coefficient of permeability, k, of granular soils that may occur in natural deposits as placed in embankments, or when used as base courses under pavements. The determination of k was developed under the assumptions of the validity of Darcy’s Law, which states that the coefficient of permeability is the ratio of the flow rate to the hydraulic gradient. In order to limit consolidation influences during testing, this procedure is limited to disturbed granular soils with permeability in range of 1 to 1x10-5.


  BS 1377:5‰EN 17892-11‰AASHTO T215‰ASTM D2434

Spécifications techniques

Numéros de commande


Constant head apparatus kit. Include: constant head permeability cell, 75mm dia., Manometer stand with 3 manometer tubes 6mm dia.with ruler 1152x250x34 mm, Costant level tank assembled on height adjustable panel.


38-T0183/P: Control Panel used for saturating sample