How much can flow through an overflow?

[Fatman]

I wanted to know how much could a one inch hole and 3/4 Hole in the over flow, flow before it can not keep up with a larger pump.

[Reptoreef]

I believe a 1 inch will allow about 2000 gph???

[stevebla]

600 on 1" 300 on .75 but that is best case

[Iconz]

I believe steve is right on the 1", not that sure on a .75" though. That seems like a large drop-off...

[stevebla]

Area of circle pi r squared pi =3.14...
.75 0.44
1 0.785
1.5 1.76625
2 3.14
3 7.065

[Iconz]

forgive me but... I'm assuimg the first number is the circle diameter? Even if so, can you explain how is it relevant? I'm not being a smart @$$, I really just don't know.

[stevebla]

It just shows how fast area increases with increase in diameter. 2 one inch holes is not equal to one 2 inch hole. I am not trying to be a smart ***. It is amazing how much it changes almost 10 times between diameter of 1 and 3

[Iconz]

Oh, i know you weren't, i just didn't understand your inital point ;)... heh. You're right, that is amazing.