Volume change of soils may be caused either by external (mechanical) or internal (hydraulic) stresses or a combination of both. A complete description of volume change must therefore include both mechanical and hydraulic stresses. By combining theories of mechanical and hydraulic stress states, a hydraulic function, which predicts the change of water volume as a function of the stress state parameter soil water suction (water retention curve), is adopted to model volume change.
http://soil.scijournals.org/cgi/content/abstract/68/1/57 (No Longer Available)
Ecosystem Functions Model (HEC_EFM)
Riverware
Models Sorted By Knowledge Domains
Water
Serene Ong
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