On Aug 25, 4:10*pm, "CL \"dnoyeB\" Gilbert" wrote:
...should I run a 3" PVC
pipe through a hold I cut in a cinder block at the bottom and let the
vertical rise occur in the dirt outside of the reservoir? *Or should I let
the pipe go up on the inside of the wall and out the top of the reservoir,
and forget cutting a hole in the concrete block?

I will have a 4" intake and a 4" overflow on the opposite side of the
reservoir which will be holes in the concrete blocks near the top.

Thanks for the tips.

CL

If you have the space, my opinion is to do it inside the enclosure, so
you can always observe/inspect/repair the pipe if needed.
Is this exposed to freeze/thaw? Careful to allow for positive
drainage and keep insulated/heated, especially if your setup includes
a checkvalve.