  The hydrodynamic equations for indirect excitons in the double quantum wells
are studied taking into account 1) a possibility of an exciton condensed phase
formation, 2) the presence of pumping, 3) finite value of the exciton lifetime,
4) exciton scattering by defects. The threshold pumping emergence of the
periodical exciton density distribution is found. The role of localized and
free exciton states is analyzed in the formation of emission spectra.
