  We rederive relativistic hydrodynamics as a Lagrangian effective theory using
the doubled coordinates technique, allowing us to include dissipative terms. We
include Navier-Stokes shear and bulk terms, as well as Israel-Stewart
relaxation time terms, within this formalism. We show how the inclusion of
shear viscosity, and the requirement of a bounded energy-momentum "vacuum",
forces the inclusion of the Israel-Stewart term into the theory, thereby
providing a justification for the origin and uniqueness of these terms.
