The paper reviews the scaling of hydraulic processes in centrifuge model tests under
increased acceleration fields. Scaling relations used for the design and interpretation of model tests are
found to be complex and affected by a wide range of variables. Classical scaling relations applied to slow,
consolidation conditions or rapid dynamic conditions are developed into a comprehensive set of scaling
techniques for laminar and turbulent flow. It is found that the interpretation of any given model test
requires very careful consideration to ensure that key decisions such as the scaling of grain size or the
viscosity of the pore fluid permit the best interpretation of the model data. Examples are given of the
scaling of waves, turbulent and laminar flow, and erosion processes.