How fast does water drain?

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Originally Posted by Myka

If you have two drains, why not use them both and do a Herbie style silent drain? That's what I have going on my 90. The 1 1/2" bulkhead is my main drain with the 1" as my backup drain.

+1 on this suggestion!

Also...there aren't easy answers as to how much water will drain through a particular pipe size. How much goes through depends a LOT on how much water is above the hole, and how much vertical drop there is to the sump below.