Sewer and drain pipe is not designed to be under pressure, in fact most are
run only about 1/3 full. With the pressure of the water from the pond
pushing against the bottom drain, I think I would want Schedule 40. In the
larger sizes of Schedule 40, there are two types, one is designed for
pressure pipe, the other is DWV drain, waste, vent pipe. DWV PVC is
compatible with the fittings of either water pipe or dwv. The dwv fittings
are generally cheaper, have wider sweeps, Y's instead of T's.
--
RichToyBox
http://www.geocities.com/richtoybox/index.html

"Ralph" wrote in message
. ..
I have my hole almost done. Went to look at 4" pipe for bottom drain and
found a variety of pipe types. There is "sewer and drain pipe" with
styrene
fittings, Schedule 40 & 80 pipe, and corrugated pipe. I ruled out the
corrugated pipe which is flexable because it appears that waste would
collect in the groves. This leaves the sewer pipe and schedule 40. The
sewer
is much thinner but I was told this is used for septic systems outdoors
and
schedule 40 is used for indoor waste lines. The sewer is also less expense
and seems to have all the necessary fittings I would need. Any guideance
would be appreciated.