  We offer a new form for the S(nl) term in the Hasselmann kinetic equation for
squared wave amplitudes of wind-driven gravity wave. This form of S(nl) makes
possible to rewrite in differential form the conservation laws for energy,
momentum, and wave action, and introduce their fluxes by a natural way. We show
that the stationary kinetic equation has a family of exact Kolmogorov-type
solutions governed by the fluxes of motion constants: wave action, energy, and
momentum.
  The simple "local" model for S(nl) term that is equivalent to the "diffusion
approximation" is studied in details. In this case, Kolmogorov spectra are
found in the explicit form. We show that a general solution of the stationary
kinetic equation behind the spectral peak is described by the Kolmogorov-type
solution with frequency-dependent fluxes. The domains of "inverse cascade" and
"direct cascade" can be separated by natural way. The spectrum in the universal
domain is close to $\omega^{-4}$.
