  A semiclassical Thomas-Fermi method, including a Weizs\"acker gradient term,
is implemented to describe ground states of two dimensional nanostructures of
arbitrary shape. Time dependent density oscillations are addressed in the same
spirit using the corresponding semiclassical time-dependent equations. The
validity of the approximations is tested, both for ground state and density
oscillations, comparing with the available microscopic Kohn-Sham solutions.
