It is Herbie overflow you are asking about...not Kirby. That might help you if you do any googling for info.
I don't have time to go into an extensive explanation, but the one key thing about this kind of overflow that you need to plan for is the need to have TWO drain holes. One is the drain that all the water flows down...the other is backup incase anything ever blocks the flow down the first drain. The need for the emergency backup drain is the key design element that prevents most everyone from using this method.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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