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#3033 - 06/16/03 11:49 PM Bentonite thickness
Troutgal Offline

Registered: 05/09/03
Posts: 27
Loc: Kansas
Here's an engineering question:

How thick a clay blanket is required to support the hydrostatic pressure exerted by a 10' column of water??

Subsoil is quite sandy.

#3034 - 06/23/03 01:24 PM Re: Bentonite thickness
Steve Baumberger Offline
Junior Member

Registered: 01/30/03
Posts: 5
I will respond to your question in regards to "bentonite thickness". Actually, the question you should be asking is "how many pounds of bentonite are required". You will need 3.5 to 4 pounds per square foot of surface area to be treated. Water depth is not an issue, so don't try to make this rocket science. A good quality bentonite meant for pond or lagoon sealing will do the job, and expect to pay from $7-$9 per 50lb bag. You do not need to pay $20-$30 per bag as I read on a previous post. I would not recommend buying bentonite from the local farm mill as this bentonite is used for something other than pond sealing. No sense paying $2 per bag less only to find out the pond did not seal. Hope this information helps.

#3035 - 06/24/03 04:43 PM Re: Bentonite thickness
Eastland Offline

Registered: 04/20/03
Posts: 1039
Loc: Dallas TX
While building my pond, I ran into an area that needed to be sealed as well...loose gravel type rock. I have clay available, the Dozer Expert, lol 40 years experience, is spreading 4-6 inches over it as a precautionary effort. After the tractor runs over it, the seal should be fine.

#3036 - 06/25/03 01:41 PM Re: Bentonite thickness
Troutgal Offline

Registered: 05/09/03
Posts: 27
Loc: Kansas

Thanks for the responses. So far I've gotten anywhere from 2-4 pounds/sq ft suggestions. Better too much than not enough!

My only problem is how to get the bentonite to stay on a 2:1 slope. Not too steep to drive straight up or down so maybe it can be incorporated easier than I think.

Thanks for the info \:\)


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