The advantage of 2 overflows is you have a back up in-case on gets blocked. How likely that might happen considering you can guard with screens etc. There's also that the flow is split between two so quieter. Disadvantage is you have another overflow taking up space.
My understanding is RC calculator is for a linear weir (no teeth), so 9 inches isn't that much. It's going to be more how much footprint you need for the bulkheads, if glass tank allowance for drilling close to edges, room to get you hand in. Can also consider just going at a diagonal. I've got 2" drains so my dimensions not much help but sure someone with your sizes will post. You don't need teeth btw.
Have you thought about other types of overflows such as external, horizontal in tank, linear pipe? Standpipes other than Durso eg Herbie?
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02-20-2008, 12:54 PM
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