  This paper discusses a semi-numerical method of investigating the enrichment
of the intergalactic medium by galactic winds. We find that most galaxies at z
>~ 3 should be driving winds, and that (if these winds are similar to those at
low-z) these winds should escape to large distances. Our calculations -- which
permit exploration of a large region of model parameter space -- indicate that
the wind velocity, the mass of the wind-driving galaxies, the fraction of
ambient material entrained, and the available time (between wind launch and the
observed redshift) all affect wind propagation significantly; other physical
effects can be important but are sub-dominant. We find that under reasonable
assumptions, the enrichment by 3 <~ z <~ 6 galaxies could account for the
quantity of metals seen in the Ly-alpha forest, though it is presently unclear
whether this enrichment is compatible with the intergalactic medium's detailed
metal distribution or relative quiescence.
