A method of quenching the kinetic energy of an incident stream, a pool of dissipation of energy of a water stream (options), a device for differentiating the velocity of a liquid by its cross section, a differential energy quencher, a method of quenching the kinetic energy of a liquid, a method of protecting rivers from erosion on spillways, coasts of the seas from erosion in the coastal zone, a device for protecting the coast of the seas from erosion, a method of washing the coast of the seas due to the energy of sea waves in the coastal zone, a device for washing the coast of the seas due to nergii sea waves in the coastal zone