"John Rutz" wrote in message
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So 4'' for my bottom drains, skimmer, filter, all runs?

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yup that way almost no added head due to lenth of pipe run

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I assume that it is safe to bury these pipes? I plan to lay the bottom
drains before I line the pond, and then cut the liner to fit around the
pipes. So some weight of the pond will be on these pipes.

I am also curious, as I have not investigated pumps yet, as to what the
standard fitting size is for a pump? I assuming it is not a 4'' connection
point. So is downsizing from 4'' to 2'' a problem?

BV.