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Old 08-10-2013, 03:07 PM   #1
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Sump put drain field


So I have these plans to build a sump pit drain field, about 30' long.

I'm in Manitoba, though, and have freezing concerns. I know my septic field is shallow in the 3' deep area. Manitoba government says septic drain fields are to be 3.25' max depth.

However, there won't be any septic bacteria heating this sump pit field up. So anyone have a recommended depth? Does it matter? Does the bacterial heat even come into play? I was thinking of 8" of mulch as insulation over the drain rock and then 12" of soil over 16" of drain rock. 3' deep total.

Thoughts?
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Old 08-10-2013, 03:13 PM   #2
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Don't they inspect septic installs in your area?

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Old 08-10-2013, 03:19 PM   #3
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It's not septic. Have you any thoughts on the freezing possibility? I suppose I could deepen the mulch layer by 4".
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Old 08-10-2013, 03:27 PM   #4
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ask the building department what your frost protection depth requirement is and install your drain system at least that depth (to top of system)
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Old 08-10-2013, 03:37 PM   #5
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Hmmm, I suppose I could just divert it back to the septic tank/field (as is currently happening) if it freezes. Put up a snow fence and tell people to keep the hell off? Frost limit is probably too deep to be useful in the 5-6 feet range, meaning digging a 6-8 feet trench!
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Old 08-10-2013, 03:58 PM   #6
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in my area we use plastic chambers set only a foot below grade with some stone (usually a foot or so) below the chambers. we have a 4' frost protection depth in Massachusetts.

plastic chambers are able to store excess water. seems to work fine here.

ask the town/city what most people in your area typically do
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Old 08-10-2013, 04:06 PM   #7
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Are you speaking of a french drain for a sump pump?
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Old 08-10-2013, 04:24 PM   #8
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I doubt I'd be able to get a hold of the plastic chambers at home depot. I think that's what we have for the septic field. The grass grows very well back there . As long as it doesn't smell whatever.

Anyhoo, yes, like a french drain.
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Old 08-10-2013, 06:04 PM   #9
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I would not suggest saturating your septic tank leech field with storm water.. That is a terrible idea.
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Old 08-10-2013, 09:39 PM   #10
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Well there won't really be any weeping tile input to saturate this new drain field during the winter, and my water softener backwashes into the sump pit and I don't want that going to the septic field. Thus I want this new trench built to take on weeping tile, washing machine, iron filter and water softener backwash. I'm hoping 30' is oversized, and all will be well.

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