Really, I can't see why drilling the back is any different that drilling the bottom. I wouldn't say that drilling the back is any weaker. The only difference between the two positions is that the holes on the bottom have even hydraulic pressure on them, where on the back panel a hole has a slight pressure differential from the top of the hole to the bottom of the hole. Drill holes which ever way makes the most sense for your overflow design. For internal overflow weirs, it makes sense to just drill in the bottom and run the stand pipe straight down. If you're doing a coast to coast, beananimal, external overflow, etc where the water needs to go out the back, well then drill it as such.
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11-06-2012, 01:06 AM
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