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#224255 - 06/30/10 05:34 PM 3:1 slope?
Gmoore Offline


Registered: 06/03/10
Posts: 63
Loc: Midland, Tx
I will have to excavate my pond from flat ground, no dam, no runoff to speak of. And will line with vinyl or bentonite (mixed blanket with a foot of natural soil to cover.

I have read in numerous places that the slope of a pond should not exceed 3:1 to keep soil from sliding down the liner. I assumed this meant 3 inches per foot, is that correct? Or is it 1 foot drop in 3 foot of run? Doesn't sound like much, but a difference of 7.5 ft of depth or 10 ft in a 60 foot diameter pond is quite a bit.

Do I really need to pay that much attention:
1. with a vinyl liner?
2. with bentonite liner?

Will the topsoil slide down off of these, will the bentonite layer slide down leaving no seal at top?

etc. etc.

Greg

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#224263 - 06/30/10 07:10 PM Re: 3:1 slope? [Re: Gmoore]
hawgtusks Offline
Lunker

Registered: 08/25/09
Posts: 28
Loc: Arkansas
3:1 means 1 foot of drop per 3 feet of run.

You probably don't want to exceed that slope with either method of creating your seal.

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#224337 - 07/01/10 09:20 AM Re: 3:1 slope? [Re: hawgtusks]
Gmoore Offline


Registered: 06/03/10
Posts: 63
Loc: Midland, Tx
That is good news, it means I can get to 10ft deep. I thought I would set the liner on a round shape with 3:1 slope. then build any points or irregularities with dug out soil.

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#224715 - 07/03/10 11:52 PM Re: 3:1 slope? [Re: Gmoore]
Rainman Offline
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Registered: 06/06/07
Posts: 7000
Loc: St Louis, MO area
Gmoore, If it were my pond, and it's not, I would opt for the bentonite as the seal. Any Liner will eventually have to be replaced and if the bentonite is disced and compacted properly, it will last a lot longer.

The 3:1 slope would not be an issue with bentonite, but a steeper drop could make getting out of the pond very difficult.
_________________________
Rainman

www.TilapiaStockers.com


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#224771 - 07/04/10 12:40 PM Re: 3:1 slope? [Re: Rainman]
Gmoore Offline


Registered: 06/03/10
Posts: 63
Loc: Midland, Tx
Thanks for the info, I have two test holes that I shoveled yesterday to test bentonite, it looks very promising so far.

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