Anything wrong with this overflow design?

[lucidheights]

I'm trying to design the smallest overflow possible for my next build 4x2x2. i just want to know if you think this would work. Both bulkheads are for 1" pvc, the bottom hole is full syphon while the top is a safety drain, bean/animal style. i originally designed a coast to coast, but decided this would be a lot easier to fix should something go wrong.

http://i815.photobucket.com/albums/zz74/lucidheights/4x2x2slimtinyoverflow.jpg

http://i815.photobucket.com/albums/zz74/lucidheights/4x2x2slimtinyoverflow2.jpg

the point is to make it very small, while making it dead silent.

[jasonmxrcr]

I no expert for sure but I don't think that will work unless it is a very small tank. You have to have a certain percentage of overflow inches to flow rate. Otherwise the overflow will suck air.

[smoq]

I no expert for sure but I don't think that will work unless it is a very small tank. You have to have a certain percentage of overflow inches to flow rate. Otherwise the overflow will suck air.

+1 That is why all overflows are wide.

[lucidheights]

I no expert for sure but I don't think that will work unless it is a very small tank. You have to have a certain percentage of overflow inches to flow rate. Otherwise the overflow will suck air.

i was under the impression that the overflow size to flow rate ratio pertained to durso style overflows. So your saying that even if the syphon drain was dialed back to the point where the water level rose to the second drain, it would suck air? btw i estimate that only 600 gph will pass through this drain after head loss.

[tinkerman]

It shouldn't suck air as I have a beananimal set up where the box is only 6" tall and don't have issues with it sucking air. Not sure why you would only make the box 4" wide as you won't get much surface skimming out of it.