Help whats wrong with my sustainable mittledier garden?

Jim,
It took me awhile to check this and get back...on the www.growfood.com website it does recommend the 50 percent blowsand to 50 percent peat moss as an option for custom-made soil, so if that is incorrect, it should be changed. I bought the pipes already drilled, so I am not sure what size the holes are. I am trying the suggestion that I place landscape cloth under the pipes. It seems to be working so far.
Thanks,
Wendy

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In answer to Wendy's questions about watering in the Grow-Boxes:

The first mistake you made was in the % of peatmoss to sand. We
always tell folks to use at least 2/3 peat or other organic material -
and as much as 75%. 50% sand allows the water to drain too
quickly. So the first thing I would do, if possible, is add more
peat, sawdust, or perlite.

The next thing to look at is the size of your holes in the PVC pipe.
Did you use a #57 drill bit? Sometimes people ignore the
instructions in this ragard, thinking that a 1/16th inch bit is ok,
but it is not! A #57 bit is only .042" in diameter, as compared
to .0625" for a 1/16th. This allows far more water to come out, and
at greater force.

Either or both of those conditions could explain your percieved
problem. If neither of those are the reasons, write again and we'll
take another look at it