  The propagation of water waves of finite depth and flat bottom is studied in
the case when the depth is not small in comparison to the wavelength. This
propagation regime is complementary to the long-wave regime described by the
famous KdV equation. The Hamiltonian approach is employed in the derivation of
a model equation in evolutionary form, which is both nonlinear and nonlocal,
and most likely not integrable. Possible implications for the numerical
solutions are discussed.
