We present parallel 3D finite element computations of unsteady, 
incompressible free-surface flows. The approach is based on the 
Deformable-Spatial-Domain/ Stabilized Space-Time (DSD/SST) finite element 
formulation, which takes automatically into account the motion of the free 
surface.  The free-surface height is governed by a kinematic free-surface 
condition, which is also solved with a stabilized formulation. The mesh update 
can be achieved with general or special-purpose mesh moving schemes. The 
general mesh update schemes describe the mesh as a fictitious solid material, 
subject to appropriate constitutive relations. These relations can take the 
form of linear elasticity, or more complex nonlinear equations. The parallel 
implementation based on MPI message-passing standard is fully portable, and 
have been demonstrated to be scalable on a range of architectures. Examples 
will include a 3D computation of a flow past a spillway of a dam.