  In recent years evidence has accumulated that nearby spiral galaxies are
surrounded by massive haloes of neutral and ionised gas. These gaseous haloes
rotate more slowly than the disks and show inflow motions. They are clearly
analogous to the High Velocity Clouds of the Milky Way. We show that these
haloes cannot be produced by a galactic fountain process (supernova outflows
from the disk) where the fountain gas conserves its angular momentum. Making
this gas interact with a pre-existing hot corona does not solve the problem.
These results point at the need for a substantial accretion of low angular
momentum material from the IGM.
