Table 1: Estimated soil permeability ( ) based on normalized CPT soil behavior type (SBTn) by Robertson [2] (modified from Lunne et al., [11]).

SBTn zoneSBTnRange of k (m/s)

1 Sensitive fine grained3 × 10−10 to 3 × 10−8NA
2Organic soils clay1 × 10−10 to 1 × 10−8
3Clay1 × 10−9 to 1 × 10−9
4Silt mixture3 × 10−9 to 1 × 10−7
5Sand mixture1 × 10−7 to 1 × 10−5
6Sand1 × 10−5 to 1 × 10−3
7Dense sand gravelly sand1 × 10−3 to 1
8 Very dense/stiff soil*1 × 10−8 to 3 × 10−5NA
9Very stiff fine-grained soil*1 × 10−9 to 3 × 10−7NA

Overconsolidated and/or cemented.