  We present evidence for cosmological gas accretion onto spiral galaxies in
the local universe. The accretion is seen through its effects on the dynamics
of the extra-planar neutral gas. The accretion rates that we estimate for two
nearby spiral galaxies are of the order of their star formation rates. Our
model shows that most of the extra-planar gas is produced by supernova feedback
(galactic fountain) and only 10-20 % comes from accretion. The accreting
material must have low specific angular momentum about the disc's spin axis,
although the magnitude of the specific angular-momentum vector can be higher.
We also explore the effects of a hot corona on the dynamics of the extra-planar
gas and find that it is unlikely to be responsible for the observed kinematical
pattern and the source of accreted gas. However, the interaction with the
fountain flow should profoundly affect the hydrodynamics of the corona.
