Fig. 15. Relationship between the K_s value and the porosity of weathered granitic bedrock measured in various sites (Johnson-Maynard et al., 1994; Graham et al., 1997; Frazier et al., 2002). Measured in the laboratory. Measured in situ. Final infiltration rate is regarded as the K_s value. ¶ _s substituted for the porosity.