Custom Tank

[Eb0la11]

Originally Posted by banditpowdercoat

http://www.reefcentral.com/calc/drain.php

Ya I've seen this. It'd be nice to know how high the water "overflows" into the overflow box when they calculate the drainage on that. Cause Im sure a 2.5"x18" constant waterfall is a hell of a lot more than 1200 GPH...

Lets do some math. A 2" drain has a 2500 GPH flow rate according to this site:
http://www.diamondbitsusa.com/index....d=48&Itemid=60

Now, this has a linear surface area of 3.14" (1 squared x pi)

My overflow has a linear surface area of 45" (18"x2.5")...

So I have two 2" drains, so 5000 GPH. Now assuming the drainage through the overflow is the same as through the drain (gravity might help) my overflow technically could handle 35,828 GPH before itd start to overflow the edges of my tank...

This dude has been building tanks for 30 years. He quoted what 1/2" bulkheads and 2" bulkheads are rated at for maximum flow off the top of his head. He had a tank with a 3 foot grand cayman alligator in it in the lobby of his shop.... I'm sure he knows what he's doing.

Lets just say the limiting factor on my drainage is my bulkheads, not my overflow cut out.