Three-parameter models

Campbell (1974)

0.08134

0.5246984

0.007665

0.8796749

0.003703

0.9788181

Tani (1982)

0.07873

0.5661897

0.004983

0.9509574

0.004749

0.9648825

Exponential

0.07792

0.5783668

0.003783

0.9720321

0.003793

0.9777493

Four-parameter models

Gardner (1958)

0.016564

0.9893501

0.002568

0.991553

0.009743

0.9905466

Ruso (1998)

0.07796

0.577969

0.004351

0.9703861

0.00445

0.9770206

Brooks-Corey (1964)

0.07991

0.548148

0.008066

0.8941245

0.003813

0.9831745

Kosugi (1999)

0.07988

0.5486333

0.002266

0.9920582

0.003795

0.9833413

Five-parameter models

Fredlund-Xing (1994)

0.07703

0.5919019

0.002646

0.9918761

0.003523

0.9904626

v an Genuchten (1980)

0.07705

0.5914976

0.002568

0.992349

0.004789

0.9823130

Biexponential (Omuto, 2009)

0.017174

0.9885479

0.002463

0.9906058

0.002447

0.9931029