Well Craig, I know you think you just know this stuff just by your gut and you have no need for numbers, science and such. Me, I don't know for a fact that given all the fittings, the splits, the merges, different pipe locations that a 4" pipe isn't needed. And who knows, you could be right. But lets not confuse luck with knowledge. I prefer to do the calculation rather than rely on your gut if you don't mind too much.
You see, this is exactly why you get people ticked off of you. I never said I have no time for numbers or science. I don't know this all by "my gut" and I asked you a simple question. Then you turn around and insult the hell out of me. Why would you do that? Even after I JUST posted that I increased my overflow on my new pond because of your previous postings. You might have a ton on knowledge but you can be truly an ass in the dispensing of it.
From now on, I'm not going to bother posting on any thread you are. It just isn't worth it.
Craig