  The description of the Egorov hydrodynamic type systems is presented in
language of conservation laws. Under extra conditions of semisimplicity and
homogeneity tri-Hamiltonian structures of such systems are described. Even and
odd cases are related with flat and metric of constant curvature, respectively.
Some important and well-known examples like averaged by Whitham approach and
dispersionless limits of vector NLS and vector LSR are investigated.
