Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Table 2

Permeability of some residual tropical soils [30].

Reference	Soil type	Country	Parent rock	Permeability (cm/s)
Vargas [31]	Residual gneiss	Brasil	Gneiss	à
	Residual basalt	Brasil	Basal	2.10^−7
Terzaghi and Robertson [32]	Sasumua clay	Kenya	Volcanic ash	à
Matyas [33]	Sasumua clay	Kenya	Volcanic ash	à
Fruhauf and Willis [34]	Laterite	Hawaï	Basalt	à
de Graft-Johnson et al. [35]	Lateritic clay	Ghana	Granite	à