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  1. #1
    Senior Member gator's Avatar
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    gph out of 3/4" bulkhead drain

    I've got a 20 gal XX high tank, and I've drilled a hole for a 3/4" bulkhead about 8" down from the water line. What kind of gph draining capacity can I expect to the sump? (the sump will be located about 4' below the water line of the DT).

    Thanks.

  2. #2
    Senior Member pwall's Avatar
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    I think it depends on how much gph is going into the tank from the sump.
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
    Yahoo IM: pwallnfld

  3. #3
    Senior Member gator's Avatar
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    Well...that's part of the problem, I want to size my return pump for this system based on about 2/3rds the maximum capacity of the 3/4" bulkhead. BTW: I'm going to install a standpipe with a DIY overflow box at the water line. I've been told (I hope it was good advice) that a 3/4" return bulkhead can easily handle 200 gph, but I was kind of wondering if anyone had an idea of the rough maximum flow rate, given a 4' head, etc.

  4. #4
    Senior Member tang_man_montreal's Avatar
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    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  5. #5
    Senior Member gator's Avatar
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    Thanks very much, Tang Man! I guess I kind of did it backwards, should have determined what flow rate I wanted first, but I only have a 1-1/2" diamond bit available. I'll get a return pump that puts out about 200 gph at 4'. (was worried that I would have to drill another hole - two overflows in a 20 gal extra-high tank would have looked pretty stupid!)

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