Fig. 1: Arrangement for Constant Head permeability
(a) Permeameter mould of capacity of 1000 ml, with an internal diameter of 100±0.1 mm
and internal effective height of 127.3±0.1 mm,
(b) Compacting equipment of 50 mm diameter circular face, weight 2.76 kg and height of fall 310 mm and
(c) a bade with a porous disc, 12 mm thick which has the permeability 10 times the expected permeability of soil.